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ACCES
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in
walk
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ically
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ce
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away
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In
th
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p
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p
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s
ed
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s
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“AC
C
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th
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m
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ar
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ep
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a
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a
p
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wh
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not
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d
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en
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ap
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is
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can
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t
h
e
v
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d
also
s
p
ea
k
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th
em
t
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o
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t
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m
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-
s
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v
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io
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.
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o
wn
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ca
n
be
away
f
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o
m
h
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m
e
an
d
s
till
let
th
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is
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in
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All
lo
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d
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n
lo
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o
p
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atio
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s
ar
e
lo
g
g
ed
an
d
u
s
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s
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later
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k
th
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to
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v
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id
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of
wh
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h
as
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p
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f
u
l
in
ca
s
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of
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ity
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s
u
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cr
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On
ev
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b
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th
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v
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s
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ap
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t
to
th
e
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an
also
s
to
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ed
.
T
h
is
g
iv
es
a
v
er
y
clea
r
v
iew
of
all
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ito
r
s
ev
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if
th
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n
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wn
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E
v
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h
as
a
s
in
g
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p
r
i
m
ar
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t
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co
n
tr
o
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to
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n
u
m
b
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f
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ch
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also
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f
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ev
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o
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s
u
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at
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tely
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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f
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&
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b
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N:
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4
8
6
4
A
C
C
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S
–
I
o
T e
n
a
b
le
d
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ma
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ck
(
Ha
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s
h
ith
Ga
d
u
p
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)
177
ac
ce
s
s
th
eir
lo
ck
s
wh
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u
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do
it
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ly
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te
m
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ap
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2.
RE
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D
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p
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by
r
ec
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izin
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R
FID
tag
[
1
]
,
[
2
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.
T
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m
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th
o
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in
[
3
]
s
u
g
g
ests
th
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se
of
Z
ig
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tag
s
,
alo
n
g
with
m
o
tio
n
s
en
s
o
r
s
to
d
etec
t
t
h
e
p
r
esen
ce
of
p
eo
p
le
in
th
e
v
icin
ity
of
th
e
d
o
o
r
,
wh
ile
m
et
h
o
d
[
4
]
s
u
g
g
ests
th
e
u
se
of
n
ea
r
f
ield
co
m
m
u
n
icatio
n
(
NFC
)
h
as
b
ee
n
attem
p
t
ed
to
in
cr
ea
s
e
ac
cu
r
ac
y
of
d
etec
tio
n
.
T
h
e
m
ajo
r
d
r
awb
ac
k
of
all
th
ese
s
y
s
tem
s
is
th
at
th
ey
n
ee
d
th
e
u
s
er
s
to
be
p
h
y
s
ically
p
r
e
s
en
t
f
o
r
o
p
e
r
atio
n
,
h
en
ce
r
em
o
te
ac
ce
s
s
in
not
p
o
s
s
ib
le
.
Als
o
,
R
FID
tag
s
,
Z
ig
b
ee
tag
s
an
d
NFC
ca
r
d
s
b
ec
o
m
e
ad
d
itio
n
al
p
iece
of
eq
u
ip
m
en
t
wh
ich
can
be
lo
s
t,
d
am
ag
ed
or
f
o
r
g
o
tten
by
th
e
u
s
e
r
.
Fu
r
th
er
m
o
r
e
,
th
e
r
e
is
no
u
s
er
in
ter
f
ac
e
f
o
r
r
eg
is
ter
in
g
th
e
d
ev
ices
a
n
d
ev
er
y
ta
g
,
m
o
d
u
le
an
d
m
icr
o
co
n
tr
o
ller
n
ee
d
s
to
be
h
ar
d
co
d
ed
with
ac
ce
s
s
cr
ed
en
tials
,
an
d
th
is
r
ed
u
ce
s
th
e
f
lex
ib
ilit
y
of
th
e
s
y
s
tem
.
T
h
is
is
al
s
o
s
u
b
jecte
d
to
s
e
v
er
al
f
alse
r
eq
u
ests
b
ec
au
s
e
th
e
s
y
s
tem
will
id
en
tify
th
e
eq
u
ip
m
en
t
e
v
en
if
it
a
cc
id
en
tally
co
m
es
with
in
r
an
g
e
of
th
e
d
etec
to
r
.
Sev
er
al
co
n
ce
r
n
s
h
av
e
b
ee
n
r
a
is
in
g
ab
o
u
t
NFC
s
n
if
f
in
g
a
n
d
ea
v
esd
r
o
p
p
i
n
g
,
b
ec
au
s
e
of
wh
ich
NFC
ca
n
n
o
t
be
co
n
s
id
er
ed
co
m
p
letely
s
ec
u
r
e
.
In
th
e
p
r
o
p
o
s
ed
s
y
s
tem
,
al
l
eq
u
ip
m
e
n
t
is
elim
in
ated
an
d
r
e
p
lace
d
by
th
e
m
o
b
ile
p
h
o
n
e
ap
p
licatio
n
.
Sin
ce
alm
o
s
t
ev
er
y
o
n
e
h
as
a
m
o
b
ile
phone
t
o
d
a
y
,
h
a
v
in
g
a
s
y
s
tem
d
ep
en
d
en
t
on
p
h
o
n
es
is
more
f
ea
s
ib
le
th
an
in
tr
o
d
u
cin
g
n
ew
eq
u
ip
m
e
n
t
to
be
ca
r
r
ied
.
T
h
e
p
r
o
b
lem
of
not
h
av
in
g
r
em
o
te
ac
ce
s
s
is
al
s
o
o
v
er
co
m
e
,
an
d
t
h
e
s
ec
u
r
ity
asp
ec
ts
ar
e
all
co
v
er
ed
(
as
d
is
cu
s
s
ed
in
later
s
ec
tio
n
s
)
.
B
io
m
etr
ics
[
5
]
s
u
ch
as
f
in
g
e
r
p
r
in
t
[6
]
,
[
7]
ir
is
s
ca
n
n
in
g
a
n
d
f
ac
e
r
ec
o
g
n
itio
n
[
8
]
,
[
9]
h
av
e
b
ee
n
u
s
ed
to
o
p
e
r
a
t
e
d
o
o
r
lo
ck
s
.
In
th
ese
s
y
s
tem
s
al
s
o
r
em
o
te
ac
ce
s
s
ca
n
n
o
t
be
im
p
lem
e
n
ted
an
d
th
ey
n
ee
d
s
p
ec
if
i
c
eq
u
ip
m
en
t
th
at
n
ee
d
s
h
ea
v
y
m
ain
ten
an
ce
.
In
m
eth
o
d
o
lo
g
y
[1
0
]
we
s
ee
th
e
u
s
e
of
a
Wi
-
Fi
co
n
n
ec
tio
n
.
All
th
e
h
o
u
s
e
ap
p
lian
ce
s
an
d
d
e
v
ices
ar
e
attac
h
ed
to
a
R
asp
b
er
r
y
Pi
an
d
wh
en
th
e
u
s
er
’
s
p
h
o
n
e
an
d
Pi
g
et
co
n
n
ec
ted
on
th
e
s
am
e
n
etwo
r
k
,
th
e
u
s
er
can
co
n
tr
o
l
all
th
e
co
n
n
ec
te
d
d
ev
ices
.
T
h
is
is
a
m
u
ch
more
s
ec
u
r
e
m
eth
o
d
b
u
t
ca
n
n
o
t
allo
w
r
em
o
te
ac
ce
s
s
.
T
h
e
b
lo
ck
c
h
ain
m
eth
o
d
h
as
b
ee
n
u
s
ed
f
o
r
co
o
r
d
in
atin
g
th
e
in
ter
ac
tio
n
b
etwe
en
n
o
d
es
[
11
]
.
B
lo
ck
ch
ain
is
a
m
eth
o
d
wh
ich
allo
ws
a
tr
an
s
ac
tio
n
wh
e
n
all
p
ar
ticip
atin
g
en
titi
es
a
ck
n
o
wled
g
e
it.
All
p
ar
ticip
atin
g
d
ev
ices
ar
e
ca
lled
n
o
d
es
an
d
o
n
ce
th
e
u
s
er
’
s
phone
h
as
co
n
n
ec
ted
to
o
n
e
d
ev
ice
(
ass
u
m
in
g
a
R
asp
b
er
r
y
Pi),
it
can
co
m
m
u
n
icate
with
an
y
o
th
er
co
n
n
ec
ted
d
ev
ice
p
r
o
v
i
d
ed
th
e
tr
an
s
ac
tio
n
h
as
b
ee
n
ap
p
r
o
v
ed
by
a
ch
o
s
en
n
u
m
b
e
r
of
p
ar
ticip
atin
g
n
o
d
es.
T
h
is
is
,
h
o
wev
er
,
tim
e
-
co
n
s
u
m
i
n
g
an
d
co
m
p
lex
to
an
ex
ten
t.
W
e
b
ap
p
licatio
n
s
h
av
e
also
b
ee
n
u
s
ed
f
o
r
l
o
ck
f
u
n
ctio
n
s
,
wh
er
e
th
e
u
s
er
s
h
av
e
h
a
d
to
lo
g
in
to
web
s
ites
to
ac
ce
s
s
th
e
co
n
tr
o
l
p
o
in
t
f
o
r
t
h
eir
lo
ck
s
[
12
]
.
T
h
is
r
eq
u
ir
es
lo
g
g
in
g
in
to
th
e
web
ap
p
licatio
n
f
o
r
ev
er
y
o
p
er
atio
n
.
T
h
er
e
is
no
s
o
lu
tio
n
to
a
s
itu
atio
n
wh
er
e
t
h
e
in
ter
n
et
m
ay
be
tem
p
o
r
ar
ily
u
n
av
ailab
le.
Als
o
,
in
m
o
s
t
im
p
lem
en
tatio
n
s
,
lack
of
o
r
g
an
izatio
n
of
u
s
er
in
ter
f
ac
e
m
ay
lead
to
in
c
o
n
v
e
n
ien
c
e
of
u
s
e.
AC
C
E
SS
co
m
p
r
is
es
a
m
o
b
ile
ap
p
licatio
n
wh
ich
d
o
es
n
o
t
r
eq
u
ir
e
r
ep
ea
ted
lo
g
g
in
g
in
an
d
m
ak
es
n
o
tific
atio
n
s
in
s
tan
t.
Of
f
lin
e
au
th
en
ticatio
n
m
ec
h
an
is
m
s
act
as
a
b
ac
k
u
p
f
o
r
s
itu
atio
n
s
of
lack
of
in
te
r
n
et.
So
m
e
m
icr
o
-
co
n
tr
o
ller
s
s
u
ch
as
th
e
Galileo
b
o
ar
d
[
1
3
]
,
Ar
d
u
in
o
,
E
SP
,
A
T
t
i
n
y
1
3
,
PIC
MC
[
14
]
h
a
v
e
b
ee
n
u
s
ed
f
o
r
th
e
co
n
tr
o
llin
g
of
lo
ck
s
.
Ho
wev
er
,
th
ei
r
f
u
n
ct
io
n
ality
is
lim
ited
as
co
m
p
ar
ed
to
th
e
R
asp
b
er
r
y
Pi
[
1
5
]
.
Ou
r
s
y
s
tem
u
s
es
a
Pi
as
a
s
in
g
le
c
o
m
p
lete
co
n
tr
o
l
node
w
h
ich
ca
n
s
er
v
e
m
u
ltip
l
e
p
u
r
p
o
s
es
at
o
n
c
e.
So
m
e
s
y
s
tem
s
h
av
e
u
s
ed
W
eb
s
o
ck
ets
as
th
e
c
o
m
m
u
n
icatio
n
p
r
o
to
c
o
l
to
co
m
m
u
n
icate
b
etwe
en
th
e
u
s
er
’
s
m
o
b
ile
ap
p
licatio
n
a
n
d
th
e
l
o
c
k
d
ev
ice.
W
eb
s
o
ck
ets
ar
e
co
n
n
ec
tio
n
-
o
r
ien
ted
an
d
r
eq
u
ir
e
t
h
e
ap
p
licatio
n
to
be
co
n
n
ec
t
ed
to
th
e
lo
c
k
p
er
s
is
ten
tly
f
o
r
th
e
en
tire
d
u
r
atio
n
of
th
e
lo
ck
o
p
er
atio
n
s
.
T
h
e
AC
C
E
SS
s
y
s
tem
u
s
es
MQ
T
T
wh
ich
is
co
n
n
ec
tio
n
less
an
d
co
n
n
ec
ts
as
s
o
o
n
as
th
e
ap
p
licatio
n
is
o
p
en
e
d
.
D
o
o
r
b
ell
d
etec
tio
n
an
d
m
o
tio
n
s
en
s
o
r
d
etec
tio
n
ha
ve
b
ee
n
u
s
ed
to
n
o
tif
y
th
e
u
s
er
wh
en
s
o
m
eo
n
e
is
at
th
e
door
[
1
]
,
[
3
]
.
T
h
is
s
y
s
tem
u
s
es
m
icr
o
p
h
o
n
es
f
o
r
au
d
io
r
ec
ep
tio
n
alo
n
g
with
ca
m
er
as
f
o
r
p
h
o
to
ca
p
tu
r
e
of
th
e
v
is
ito
r
.
It
also
i
n
clu
d
es
t
h
e
f
ea
tu
r
e
of
s
en
d
in
g
n
o
tific
at
io
n
s
to
th
e
home
r
esid
en
ts
th
r
o
u
g
h
g
lo
b
al
s
y
s
tem
f
o
r
m
o
b
ile
co
m
m
u
n
icatio
n
s
(
GSM)
m
o
d
u
le
[
1
6
]
or
em
ail
[
1
7
]
.
T
h
e
d
r
aw
b
ac
k
of
th
e
s
y
s
tem
is
th
at
th
e
o
wn
er
m
ay
be
in
f
o
r
m
ed
ab
o
u
t
a
v
is
ito
r
but
h
as
no
m
ea
n
s
of
tak
in
g
an
ac
tio
n
to
let
th
e
v
is
ito
r
in
c
ase
th
e
o
wn
er
is
not
p
r
esen
t
at
th
e
r
esid
en
ce
.
AC
C
E
SS
co
n
tain
s
a
s
p
ea
k
er
in
ad
d
itio
n
to
th
e
m
icr
o
p
h
o
n
e
so
th
at
th
e
v
is
ito
r
m
ay
s
p
ea
k
to
th
e
o
w
n
e
r
,
ex
ac
tly
t
h
e
way
it
h
ap
p
en
s
wh
e
n
th
e
o
wn
er
is
p
r
esen
t
in
p
er
s
o
n
.
Als
o
,
th
e
o
wn
e
r
ha
s
th
e
p
r
iv
ileg
e
to
u
n
lo
c
k
th
e
d
o
o
r
f
r
o
m
wh
er
ev
e
r
he
is
at
th
e
cu
r
r
en
t
m
o
m
e
n
t.
GSM
m
o
d
u
les
ar
e
s
lo
w
in
o
p
er
atio
n
al
s
p
ee
d
an
d
r
eq
u
ir
e
a
s
ep
ar
ate
d
ed
icate
d
SIM
ca
r
d
co
n
n
ec
tio
n
with
s
tr
o
n
g
co
n
n
e
ctiv
ity
.
T
h
is
m
ak
es
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
9
-
4
8
6
4
I
n
t J Reco
n
f
ig
u
r
a
b
le
&
E
m
b
ed
d
ed
Sy
s
t,
Vo
l.
10
,
No
.
3
,
No
v
em
b
er
2
0
2
1
:
176
–
18
5
178
th
em
a
s
lig
h
tly
in
co
n
v
en
ien
t
ch
o
ice
f
o
r
th
is
k
in
d
of
a
s
y
s
tem
.
C
o
m
p
ar
ativ
ely
,
em
ails
ar
e
co
n
v
en
ie
n
t
but
r
eq
u
ir
e
s
ep
ar
ate
p
aid
s
er
v
ices
to
be
m
ain
tain
ed
.
T
h
is
in
cr
ea
s
es
th
e
co
s
t
of
im
p
lem
en
tatio
n
.
Als
o
,
em
ails
m
ay
not
be
c
h
ec
k
ed
r
eg
u
lar
l
y
by
u
s
er
s
.
T
h
er
e
ar
e
s
o
m
e
s
y
s
tem
s
wh
ich
i
n
v
o
l
v
e
m
o
b
ile
ap
p
licatio
n
b
ased
ac
ce
s
s
to
d
o
o
r
lo
c
k
s
as
in
[1
8
].
So
m
e
of
th
ese
ap
p
licatio
n
s
c
o
n
n
e
ct
to
th
e
m
icr
o
co
n
tr
o
ller
v
ia
B
lu
eto
o
th
[
1
9
]
or
lo
ca
l
a
r
ea
n
etwo
r
k
(
L
AN
)
co
n
n
ec
tio
n
s
,
in
d
icatin
g
th
e
in
ab
ilit
y
to
f
u
n
ctio
n
r
em
o
tely
.
B
lu
eto
o
th
is
a
two
-
way
co
n
n
e
ctio
n
p
r
o
t
o
co
l
wh
ich
r
eq
u
ir
es
a
m
eth
o
d
ca
lled
p
air
i
n
g
[
2
0
]
.
In
th
is
,
b
o
th
c
o
n
n
ec
ti
n
g
p
ar
ties
m
u
s
t
ac
ce
p
t
an
d
en
ter
th
e
co
n
n
ec
tio
n
.
In
co
n
t
r
ast
to
th
is
,
B
lu
eto
o
th
lo
w
en
er
g
y
(
B
L
E
)
[
2
1
]
r
eq
u
i
r
es
lo
wer
p
o
wer
s
in
ce
it
h
ap
p
en
s
one
way
.
T
h
e
AC
C
E
SS
s
y
s
tem
u
s
es
B
L
E
s
i
n
ce
th
er
e
is
no
p
air
in
g
r
eq
u
ir
e
d
,
o
n
ly
a
s
in
g
le
way
b
r
o
ad
ca
s
t
of
d
ata
is
s
u
f
f
icien
t
f
o
llo
wed
by
th
e
r
ec
eiv
in
g
of
th
is
d
ata
f
r
o
m
th
e
o
th
er
en
d
.
T
h
e
m
o
b
ile
ap
p
licatio
n
of
A
C
C
E
S
S
r
eq
u
ir
es
an
in
ter
n
et
co
n
n
ec
tio
n
but
th
is
is
not
an
ad
d
itio
n
al
r
e
q
u
ir
em
e
n
t
s
in
ce
all
ce
llp
h
o
n
e
u
s
er
s
to
d
ay
h
av
e
in
ter
n
et
ac
ce
s
s
.
All
n
o
tific
atio
n
s
an
d
s
er
v
er
co
m
m
u
n
icatio
n
s
tak
e
p
lace
with
th
e
h
elp
of
th
e
p
h
o
n
e’
s
in
ter
n
e
t
co
n
n
ec
tio
n
its
elf
.
3.
P
RO
P
O
SE
D
M
E
T
H
O
D
Fig
u
r
e
1
s
h
o
ws
th
e
elec
tr
ical
co
m
p
o
n
e
n
ts
co
n
tr
o
lled
by
a
R
asp
b
er
r
y
Pi
[
2
2
].
T
h
e
co
m
p
o
n
en
ts
ar
e
d
escr
ib
ed
in
th
e
f
o
llo
win
g
s
ec
tio
n
.
Fig
u
r
e
1.
Sy
s
tem
ar
c
h
itectu
r
e
3
.
1
.
H
a
rdwa
re
a
nd
m
icro
c
o
ntr
o
ller
−
So
len
o
id
lo
ck
an
d
r
elay
-
T
h
e
s
o
len
o
id
lo
ck
r
e
p
r
esen
ts
h
o
u
s
eh
o
ld
l
o
ck
s
.
It
is
co
n
tr
o
lled
by
a
r
elay
co
n
n
ec
ted
to
th
e
Pi.
W
h
en
th
e
u
s
er
g
iv
es
a
lo
ck
or
u
n
lo
ck
co
m
m
an
d
to
th
e
Pi,
th
e
r
elay
is
s
w
itch
ed
to
p
u
s
h
up
th
e
h
ea
d
of
t
h
e
s
o
len
o
id
lo
ck
(
to
lo
ck
)
or
b
r
in
g
it
d
o
wn
(
to
u
n
lo
ck
)
.
−
4
x
4
m
atr
i
x
k
ey
p
ad
a
n
d
m
a
n
u
a
l
s
witch
-
W
h
en
th
er
e
is
no
in
t
er
n
et
co
n
n
ec
tio
n
,
a
4
x
4
m
atr
ix
k
ey
p
ad
is
u
s
ed
to
en
ter
a
o
n
etim
e
p
ass
wo
r
d
(
OT
P)
wh
ic
h
is
g
en
er
ated
by
th
e
Pi
a
n
d
s
en
t
to
th
e
o
wn
er
’
s
m
o
b
ile
ap
p
licatio
n
.
If
s
o
m
e
o
n
e
is
in
s
id
e
th
eir
h
o
m
e,
t
h
ey
can
u
s
e
a
s
witch
on
th
e
in
s
id
e
of
th
e
door
to
o
p
en
it,
in
s
tead
of
u
s
in
g
t
h
e
ap
p
.
−
OL
E
D
d
is
p
lay
–
T
h
is
is
u
s
ed
f
o
r
d
is
p
lay
in
g
th
e
s
tatu
s
of
th
e
lo
ck
,
th
e
e
n
ter
ed
p
ass
wo
r
d
or
an
y
m
ess
ag
e
to
th
e
p
er
s
o
n
s
tan
d
i
n
g
at
th
e
d
o
o
r
.
−
Do
o
r
b
ell
–
W
h
en
th
is
is
p
r
ess
ed
,
th
e
Pi
n
o
tif
ies
th
e
o
w
n
er
s
th
at
a
v
is
ito
r
h
as
ar
r
iv
e
d
alo
n
g
with
a
p
h
o
to
g
r
ap
h
of
th
e
v
is
ito
r
.
−
W
eb
ca
m
er
a
an
d
s
p
ea
k
er
-
T
h
e
web
-
ca
m
er
a
s
tr
ea
m
s
t
h
e
liv
e
v
id
eo
of
th
e
v
is
ito
r
t
o
a
p
u
b
li
c
UR
L
th
r
o
u
g
h
th
e
R
asp
b
er
r
y
Pi
as
s
h
o
wn
in
Fig
u
r
e
1
.
W
h
en
th
e
u
s
er
s
p
ea
k
s
th
r
o
u
g
h
h
is
m
o
b
ile
ap
p
licatio
n
,
th
e
au
d
i
o
is
s
tr
ea
m
ed
b
ac
k
to
th
e
Pi
an
d
t
h
en
to
th
e
s
p
ea
k
e
r
.
3
.
2
.
P
o
wer
s
up
ply
T
h
e
Pi
n
ee
d
s
a
p
o
we
r
s
u
p
p
ly
of
1
2
V.
T
h
is
can
be
s
u
p
p
lied
t
h
r
o
u
g
h
th
e
USB
or
th
r
o
u
g
h
th
e
g
en
e
r
al
-
p
u
r
p
o
s
e
in
p
u
t/o
u
t
p
u
t
(
GPI
O)
p
in
s
.
T
h
e
p
o
wer
can
be
d
r
aw
n
f
r
o
m
a
p
o
we
r
b
an
k
,
d
ir
ec
t
p
lu
g
co
n
n
ec
tio
n
or
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J Reco
n
f
ig
u
r
a
b
le
&
E
m
b
ed
d
ed
Sy
s
t
I
SS
N:
2089
-
4
8
6
4
A
C
C
E
S
S
–
I
o
T e
n
a
b
le
d
s
ma
r
t lo
ck
(
Ha
r
s
h
ith
Ga
d
u
p
u
)
179
lith
iu
m
-
io
n
b
atter
ies.
All
o
th
er
co
m
p
o
n
en
ts
h
av
e
th
eir
p
o
wer
in
p
u
ts
co
n
n
ec
ted
to
th
e
p
in
s
of
th
e
Pi
an
d
can
g
et
th
eir
p
o
wer
s
u
p
p
ly
f
r
o
m
t
h
em
.
On
ly
th
e
s
o
len
o
id
lo
ck
u
s
ed
f
o
r
d
em
o
n
s
tr
atio
n
r
eq
u
ir
es
a
12V
p
o
wer
an
d
ca
n
n
o
t
d
r
aw
it
f
r
o
m
th
e
Pi
s
in
ce
th
e
m
a
x
im
u
m
o
u
tp
u
t
v
o
ltag
e
of
th
e
Pi
is
5
V.
Fo
r
t
h
e
s
o
l
en
o
id
lo
c
k
to
o
,
we
can
u
s
e
a
p
o
wer
b
an
k
,
d
ir
ec
t
p
lu
g
or
lith
iu
m
-
io
n
b
atter
y
s
ep
ar
ate
f
r
o
m
t
h
e
one
u
s
ed
f
o
r
t
h
e
Pi.
T
h
ese
can
be
co
n
n
ec
ted
to
th
e
s
o
len
o
i
d
lo
ck
th
r
o
u
g
h
its
p
o
s
itiv
e
an
d
n
eg
at
iv
e
ter
m
in
als.
3
.
3
.
Wo
r
k
ing
of
lo
c
k
o
pera
t
i
o
ns
-
H
T
T
P
a
nd
M
Q
T
T
Fig
u
r
e
2
ex
p
lain
s
th
e
s
y
s
tem
wo
r
k
f
lo
w.
T
h
e
u
s
er
’
s
m
o
b
ile
ap
p
licatio
n
(
f
r
o
n
t
-
e
n
d
)
is
d
ev
e
lo
p
ed
u
s
in
g
a
cr
o
s
s
p
latf
o
r
m
f
r
am
ewo
r
k
[
2
3
]
so
th
at
it
can
r
u
n
on
an
y
m
o
b
ile
o
p
er
atin
g
s
y
s
tem
.
T
h
e
a
p
p
licatio
n
f
u
n
ctio
n
s
by
co
m
m
u
n
icatin
g
with
th
e
a
p
p
licatio
n
s
er
v
er
(
b
ac
k
-
e
n
d
)
h
o
s
ted
on
th
e
cl
o
u
d
.
T
wo
p
r
o
to
c
o
ls
ar
e
u
s
ed
in
t
h
is
s
y
s
tem
-
h
y
p
e
r
tex
t
tr
an
s
f
e
r
p
r
o
to
co
l
(
HT
T
P)
[
2
4
]
an
d
m
ess
ag
e
q
u
e
u
in
g
an
d
telem
etr
y
(
MQ
T
T
)
[
2
5
]
.
HT
T
P
f
u
n
ctio
n
s
th
r
o
u
g
h
r
eq
u
ests
an
d
r
esp
o
n
s
es.
T
h
e
u
s
er
click
s
th
e
’
L
o
c
k
’
or
’
U
n
lo
ck
’
b
u
tto
n
f
r
o
m
h
is
m
o
b
ile
ap
p
licatio
n
an
d
an
HT
T
P
r
e
q
u
est
is
s
en
t
to
th
e
a
p
p
licatio
n
s
er
v
er
.
T
h
e
s
er
v
e
r
ch
ec
k
s
with
th
e
c
u
r
r
en
t
lo
ck
s
tatu
s
f
r
o
m
th
e
d
atab
ase
to
s
ee
if
th
e
o
p
er
atio
n
is
f
ea
s
ib
le.
Fo
r
ex
am
p
le,
a
‘
l
o
ck
’
r
e
q
u
est
on
th
e
lo
ck
wh
en
it
is
alr
ea
d
y
in
‘
lo
c
k
ed
’
s
tate
will
not
be
ex
ec
u
ted
a
n
d
th
e
u
s
er
’
s
m
o
b
ile
a
p
p
licatio
n
will
be
n
o
tifie
d
wh
eth
e
r
th
e
o
p
er
atio
n
is
in
p
r
o
g
r
ess
or
alr
e
ad
y
p
er
f
o
r
m
e
d
.
Fo
llo
win
g
th
is
,
MQ
T
T
is
ap
p
lied
.
MQ
T
T
in
v
o
lv
es
p
u
b
lis
h
er
s
wh
o
s
en
d
m
ess
ag
es
to
t
o
p
ics
an
d
s
u
b
s
cr
ib
er
s
wh
o
awa
it
th
ese
m
ess
ag
es,
with
a
b
r
o
k
er
to
c
o
m
m
u
n
icate
th
e
a
r
r
iv
a
l
of
th
ese
m
ess
ag
es.
If
th
e
r
eq
u
ested
lo
c
k
o
p
er
atio
n
ca
n
o
cc
u
r
,
t
h
e
s
er
v
e
r
p
u
b
lis
h
es
th
e
s
tr
in
g
co
n
tain
i
n
g
th
e
lo
c
k
ID
a
n
d
o
p
er
atio
n
to
th
e
MQ
T
T
to
p
ic
an
d
th
e
Pi
(
wh
i
ch
is
s
u
b
s
cr
ib
ed
to
th
e
to
p
ic
)
r
ec
eiv
es
th
is
d
ata.
No
w,
th
e
Pi
ch
ec
k
s
if
t
h
is
o
p
er
atio
n
is
p
o
s
s
ib
le
with
th
e
s
tate
of
th
e
lo
ck
wh
ich
it
h
as
s
to
r
ed
lo
ca
lly
.
If
y
es,
th
e
n
th
e
lo
ck
is
o
p
er
ated
on
an
d
th
e
lo
ck
s
tate
is
u
p
d
ated
.
T
h
e
Pi
p
u
b
lis
h
es
th
e
en
tire
d
a
ta
to
an
MQ
T
T
to
p
ic
wh
ich
tr
ig
g
er
s
a
r
e
q
u
est
to
th
e
s
er
v
er
f
o
r
u
p
d
atin
g
t
h
e
d
at
a
of
th
is
o
p
e
r
atio
n
in
to
th
e
d
at
ab
ase.
Fig
u
r
e
2.
Sy
s
tem
wo
r
k
f
lo
w
3
.
4
.
Do
o
rbell
det
ec
t
io
n
,
web
ca
m
er
a
a
nd
t
a
lk
ba
c
k
W
h
en
a
v
is
ito
r
p
r
ess
es
th
e
d
o
o
r
b
ell,
th
e
s
y
s
tem
d
etec
ts
th
is
an
d
tr
ig
g
er
s
a
n
o
tific
atio
n
to
t
h
e
o
wn
er
’
s
m
o
b
ile
ap
p
licatio
n
.
Simu
ltan
e
o
u
s
ly
,
th
e
s
y
s
tem
tak
es
s
n
ap
s
h
o
ts
of
th
e
v
is
ito
r
an
d
s
to
r
es
th
em
on
th
e
clo
u
d
f
o
r
th
e
o
wn
er
to
s
ee
.
W
h
en
t
h
e
o
wn
er
click
s
th
e
n
o
tific
atio
n
,
he
is
tak
en
to
th
e
s
cr
ee
n
f
r
o
m
wh
er
e
he
can
s
witch
on
th
e
ca
m
er
a
to
v
iew
th
e
v
is
ito
r
liv
e.
T
h
e
web
ca
m
er
a
ca
p
t
u
r
es
th
e
v
id
eo
of
th
e
v
is
ito
r
a
n
d
th
e
web
ca
m
e
r
a’
s
in
b
u
ilt
m
icr
o
p
h
o
n
e
ca
p
tu
r
es
th
e
au
d
io
.
T
h
is
web
ca
m
er
a
f
ee
d
is
s
tr
ea
m
ed
o
n
t
o
th
e
l
o
c
al
s
er
v
er
of
th
e
Pi.
R
ev
er
s
e
s
ec
u
r
e
s
h
ell
tu
n
n
elin
g
(
o
r
SSH
T
u
n
n
elin
g
)
is
u
s
ed
to
m
ak
e
th
e
we
b
ca
m
s
er
v
er
a
v
ailab
le
on
a
p
u
b
lic
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
9
-
4
8
6
4
I
n
t J Reco
n
f
ig
u
r
a
b
le
&
E
m
b
ed
d
ed
Sy
s
t,
Vo
l.
10
,
No
.
3
,
No
v
em
b
er
2
0
2
1
:
176
–
18
5
180
UR
L
so
th
at
it
can
be
s
ee
n
on
th
e
m
o
b
ile
ap
p
licatio
n
.
On
th
e
o
th
er
h
an
d
,
th
e
au
d
io
f
r
o
m
th
e
o
wn
er
(
co
m
in
g
f
r
o
m
th
e
m
o
b
ile
ap
p
licatio
n
)
is
r
ec
eiv
ed
an
d
am
p
lifie
d
by
th
e
s
p
ea
k
er
on
t
h
e
d
o
o
r
.
T
h
e
s
er
v
er
allo
ws
f
u
ll
d
u
p
lex
,
two
-
way
c
o
m
m
u
n
icatio
n
b
etwe
en
th
e
m
o
b
ile
ap
p
licatio
n
an
d
th
e
R
asp
b
er
r
y
Pi.
U
s
in
g
th
is
,
th
e
o
wn
e
r
can
s
ee
th
e
v
is
ito
r
an
d
talk
to
t
h
em
lik
e
a
v
i
d
eo
ca
ll.
3
.
5
.
User
priv
ileg
es
T
h
e
m
o
b
ile
ap
p
licatio
n
is
u
s
ed
f
o
r
m
an
y
f
ea
t
u
r
es
o
th
er
th
a
n
th
e
b
asic
lo
ck
o
p
er
atio
n
s
.
T
h
er
e
can
be
th
r
ee
ty
p
es
of
u
s
er
s
in
th
e
s
y
s
tem
:
−
Prim
ar
y
o
wn
er
s
–
T
h
ese
u
s
er
s
h
av
e
all
p
r
iv
ileg
es
f
o
r
a
lo
ck
.
T
h
ey
can
p
er
f
o
r
m
lo
ck
an
d
u
n
lo
ck
o
p
er
atio
n
s
wh
en
th
e
y
a
r
e
n
ea
r
t
h
eir
l
o
ck
s
or
e
v
en
r
em
o
tely
.
T
h
ey
can
ad
d
n
ew
lo
ck
s
,
ed
it
or
d
elet
e
ex
is
tin
g
o
n
es.
T
h
ey
ca
n
also
u
s
e
t
h
e
web
c
am
an
d
v
i
d
eo
ca
llin
g
f
ea
tu
r
e
s
.
T
h
ey
h
av
e
th
e
p
r
iv
ileg
e
to
ad
d
s
ec
o
n
d
ar
y
o
wn
er
s
or
g
u
ests
f
o
r
th
eir
l
o
ck
s
an
d
s
et
th
e
tim
e
f
o
r
th
e
ex
p
ir
y
of
th
e
p
er
m
is
s
io
n
s
.
−
Seco
n
d
ar
y
o
w
n
er
s
–
T
h
eir
p
e
r
m
is
s
io
n
s
ar
e
th
e
s
am
e
as
th
at
of
th
e
p
r
im
ar
y
o
wn
er
but
th
ey
ca
n
n
o
t
ed
it
or
d
elete
lo
ck
s
.
Fo
r
ex
am
p
le,
in
a
f
am
ily
eith
er
s
p
o
u
s
e
c
o
u
ld
be
th
e
p
r
im
ar
y
o
wn
er
wh
ile
t
h
e
o
th
er
s
p
o
u
s
e
an
d
ch
ild
r
e
n
co
u
ld
be
t
h
e
s
ec
o
n
d
ar
y
o
wn
er
s
.
T
h
e
y
can
also
c
r
ea
te
o
th
er
s
ec
o
n
d
ar
y
o
wn
er
or
g
u
est
u
s
er
s
.
−
Gu
ests
–
T
h
ey
o
n
ly
h
av
e
lo
ck
in
g
an
d
u
n
lo
ck
in
g
p
e
r
m
is
s
io
n
s
wh
ich
can
be
p
er
f
o
r
m
ed
o
n
l
y
wh
en
th
ey
ar
e
in
p
r
o
x
im
ity
of
th
e
lo
ck
s
.
Hen
ce
,
r
em
o
te
ac
ce
s
s
is
not
allo
w
ed
f
o
r
th
e
m
.
T
h
ey
can
u
s
e
th
e
ir
p
r
iv
ileg
es
till
th
e
ex
p
ir
y
tim
e
wh
ich
th
e
p
r
i
m
ar
y
or
s
ec
o
n
d
a
r
y
o
wn
e
r
s
f
ix
f
o
r
th
eir
g
u
est
ac
co
u
n
ts
.
3
.
5
.
B
luet
o
o
t
h
lo
w
ener
g
y
Gu
ests
ar
e
allo
wed
to
ac
ce
s
s
t
h
eir
lo
c
k
s
o
n
l
y
wh
e
n
t
h
ey
ar
e
p
r
esen
t
n
ea
r
th
e
lo
c
k
s
.
B
L
E
[
25
]
is
u
s
ed
to
co
n
f
ir
m
t
h
at
th
e
u
s
er
’
s
m
o
b
ile
ap
p
licatio
n
is
in
p
r
o
x
im
ity
of
th
e
lo
ck
.
C
o
n
ce
p
ts
of
B
lu
eto
o
th
an
d
B
L
E
h
av
e
b
ee
n
wid
ely
u
s
ed
f
o
r
p
r
o
x
im
i
ty
s
en
s
in
g
e
x
p
er
im
en
ts
as
d
e
p
icted
in
[
2
6
]
th
r
o
u
g
h
t
h
e
u
s
e
of
b
ea
co
n
s
.
In
th
e
p
r
o
p
o
s
ed
s
y
s
tem
,
t
he
Pi
b
r
o
a
d
ca
s
ts
a
u
n
iv
er
s
ally
u
n
iq
u
e
i
d
en
tifie
r
(
B
L
E
UUI
D
)
wh
ich
is
s
ca
n
n
ed
by
t
h
e
g
u
est’s
m
o
b
ile
ap
p
licatio
n
wh
en
he
tr
ies
to
ac
ce
s
s
th
e
lo
c
k
.
T
h
e
d
atab
ase
is
co
n
s
tan
tly
u
p
d
ated
with
th
is
UUI
D
f
r
o
m
th
e
Pi.
W
h
en
t
h
e
s
ca
n
n
ed
UUI
D
m
atch
es
th
at
on
th
e
d
atab
ase,
ac
ce
s
s
is
g
r
an
t
ed
.
T
h
er
e
ar
e
m
a
n
y
p
u
b
licly
av
ailab
le
m
o
b
ile
ap
p
licatio
n
s
wh
ich
can
s
ca
n
n
ea
r
b
y
B
L
E
d
ev
ice
UUI
Ds.
Hen
ce
it
is
p
o
s
s
ib
le
f
o
r
an
y
g
u
est
u
s
er
to
f
in
d
o
u
t
th
e
Pi’s
UUI
D
u
s
in
g
s
u
ch
an
a
p
p
an
d
th
en
clo
n
e
it
to
p
r
eten
d
to
be
n
ea
r
th
e
l
o
ck
wh
en
he
is
ac
tu
ally
n
o
t.
To
p
r
ev
en
t
s
u
ch
s
p
o
o
f
in
g
an
d
clo
n
i
n
g
,
th
e
Pi’s
UUI
D
is
ch
an
g
ed
an
d
r
eg
en
e
r
ated
at
r
eg
u
lar
in
ter
v
als
by
r
u
n
n
i
n
g
cr
o
n
jo
b
s
on
th
e
Pi
to
p
r
e
v
en
t
s
p
o
o
f
in
g
an
d
clo
n
i
n
g
.
A
n
o
r
m
al
B
lu
eto
o
th
co
n
n
ec
tio
n
as
u
s
ed
in
[
2
7
]
n
ee
d
s
b
o
th
d
ev
ices
to
a
p
p
r
o
v
e
of
th
e
co
n
n
ec
tio
n
s
in
ce
it
i
n
v
o
lv
es
two
-
way
p
air
in
g
but
in
th
e
p
r
o
p
o
s
ed
m
eth
o
d
B
L
E
is
u
s
ed
an
d
it
is
more
ef
f
ic
ien
t
f
o
r
th
e
r
e
q
u
ir
em
e
n
t
s
in
ce
th
e
Pi
s
en
d
s
out
an
ID
an
d
all
n
ea
r
b
y
d
e
v
ices
can
ca
p
tu
r
e
th
e
ID
[
2
8
]
.
T
h
e
o
n
ly
d
r
awb
ac
k
of
B
L
E
is
th
e
p
o
s
s
ib
ilit
y
of
clo
n
in
g
wh
ich
h
as
b
ee
n
s
o
lv
e
d
by
th
e
s
y
s
tem
as
well.
3
.
6
.
O
f
f
lin
e
a
cc
ess
Th
er
e
m
ay
be
s
itu
atio
n
s
w
h
er
e
th
e
s
y
s
tem
n
ee
d
s
to
o
p
er
ate
with
o
u
t
in
te
r
n
et,
if
th
e
in
ter
n
et
co
n
n
ec
tio
n
is
lo
s
t
.
T
h
is
o
f
f
li
n
e
s
y
s
tem
co
n
tain
s
a
k
e
y
p
ad
a
n
d
OL
E
D
d
is
p
lay
to
e
n
ab
le
m
an
u
al
en
tr
y
of
p
ass
-
co
d
es
f
o
r
l
o
ck
ac
ce
s
s
[
2
9
]
.
T
h
e
p
ass
co
d
e
is
g
en
er
ate
d
as
an
OT
P
wh
ich
is
s
en
t
to
th
e
u
s
er
’
s
m
o
b
ile
ap
p
licatio
n
[
3
0
]
.
W
h
en
th
e
OT
P
is
u
s
ed
,
th
e
Pi
wait
s
to
co
m
e
b
ac
k
o
n
lin
e,
an
d
th
en
th
e
n
ew
OT
P
is
g
en
er
ated
an
d
s
en
t
to
th
e
u
s
er
f
o
r
th
e
n
ex
t
u
s
e.
T
h
e
Pi
al
s
o
s
to
r
es
a
m
aster
co
d
e
lo
ca
lly
an
d
th
is
m
ay
be
u
s
ed
in
s
tead
of
th
e
OT
P.
T
h
e
letter
k
ey
s
on
th
e
k
e
y
p
a
d
ar
e
u
s
ed
f
o
r
ch
an
g
in
g
th
e
m
aster
co
d
e,
d
eletin
g
ch
ar
ac
ter
s
or
co
n
f
ir
m
in
g
th
e
en
ter
ed
c
o
d
e
s
tr
in
g
.
T
h
e
re
is
also
a
s
witch
on
th
e
in
n
er
s
i
d
e
of
t
h
e
d
o
o
r
wh
i
ch
en
ab
les
r
esid
en
ts
to
ac
ce
s
s
th
e
door
l
o
ck
m
a
n
u
a
lly
f
r
o
m
i
n
s
id
e
.
3
.
7
.
Da
t
a
ba
s
e
T
h
e
d
atab
ase
in
s
tan
ce
h
as
b
e
en
cr
ea
ted
on
clo
u
d
a
n
d
h
o
ld
s
d
ata
in
f
o
u
r
tab
les.
It
is
an
I
n
tel
AVX,
I
n
tel
T
u
r
b
o
in
s
tan
ce
with
one
s
in
g
le
co
r
e
C
PU,
1
GB
of
m
em
o
r
y
an
d
lo
w
to
m
o
d
er
ate
n
etwo
r
k
p
er
f
o
r
m
a
n
ce
.
T
h
e
tab
les
ar
e
as
f
o
llo
ws:
a)
User
s
-
Deta
il
s
of
all
th
e
u
s
er
s
wh
o
h
av
e
r
e
g
is
ter
ed
to
th
e
ap
p
licatio
n
.
Prim
ar
y
o
wn
e
r
s
,
s
ec
o
n
d
ar
y
o
wn
er
s
an
d
g
u
ests
ar
e
all
u
s
er
s
on
th
e
ap
p
licatio
n
.
T
h
e
d
ata
s
to
r
ed
in
th
is
tab
le
ar
e:
−
User
n
am
e
(
p
r
im
ar
y
k
e
y
)
,
f
u
ll
n
am
e
an
d
p
h
o
n
e
n
u
m
b
er
of
t
h
e
u
s
er
.
−
Mo
b
ile
ap
p
licatio
n
ID
-
of
th
e
u
s
er
.
W
h
en
an
ap
p
is
in
s
talled
,
it
g
en
e
r
ates
a
u
n
iq
u
e
ID
f
o
r
its
elf
an
d
th
is
is
n
ee
d
ed
as
an
en
d
p
o
in
t
f
o
r
s
e
n
d
in
g
n
o
tific
atio
n
s
.
If
a
u
s
er
h
as
s
ig
n
ed
in
f
r
o
m
m
u
ltip
le
a
p
p
s
,
th
en
all
th
e
ap
p
I
Ds
ar
e
s
to
r
ed
.
b)
L
o
ck
s
–
T
h
is
h
o
ld
s
th
e
d
etail
s
of
th
e
lo
ck
s
wh
ich
each
o
w
n
er
ad
d
s
to
h
is
ac
co
u
n
t.
E
ac
h
tim
e
he
ad
d
s
a
n
ew
lo
ck
f
r
o
m
h
is
m
o
b
ile
ap
p
l
icatio
n
,
it
is
ad
d
ed
as
a
r
o
w
in
th
is
tab
le.
T
h
e
d
ata
h
el
d
ar
e:
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J Reco
n
f
ig
u
r
a
b
le
&
E
m
b
ed
d
ed
Sy
s
t
I
SS
N:
2089
-
4
8
6
4
A
C
C
E
S
S
–
I
o
T e
n
a
b
le
d
s
ma
r
t lo
ck
(
Ha
r
s
h
ith
Ga
d
u
p
u
)
181
−
L
o
ck
ID
(
p
r
im
ar
y
k
ey
)
,
alias
(a
n
am
e
g
iv
en
by
th
e
o
wn
er
f
o
r
ea
s
y
id
e
n
tific
atio
n
)
,
ad
d
r
ess
(
wh
er
e
th
e
lo
ck
is
lo
ca
ted
)
,
u
s
er
n
am
e
(
o
f
t
h
e
o
wn
er
wh
o
cr
ea
te
d
th
e
lo
c
k
)
.
−
L
o
ck
p
r
io
r
ity
–
T
h
e
m
o
b
ile
a
p
p
licatio
n
allo
ws
lo
c
k
s
to
be
m
ar
k
ed
as
a
f
a
v
o
u
r
ite
so
th
e
y
can
be
p
lace
d
at
th
e
to
p
of
th
e
lis
t
of
lo
c
k
s
.
−
B
L
E
UI
D
an
d
m
ed
ia
ac
ce
s
s
c
o
n
tr
o
l
(
MA
C
)
ad
d
r
ess
of
th
e
Pi
.
−
C
u
r
r
en
t
lo
ck
s
tate
–
T
h
is
is
u
p
d
ated
ev
e
r
y
tim
e
a
lo
ck
o
p
er
atio
n
is
co
m
p
leted
an
d
h
e
lp
s
in
av
o
id
in
g
r
ep
etitio
n
of
o
p
er
atio
n
s
.
c)
Acc
ess
co
n
tr
o
l
lo
g
s
(
AC
L
)
-
All
th
e
s
ec
o
n
d
ar
y
an
d
g
u
est
u
s
er
s
to
wh
o
m
ac
ce
s
s
h
av
e
b
ee
n
g
r
an
ted
.
It
s
to
r
es
th
e
u
s
er
n
am
e,
lo
ck
ID
f
o
r
wh
ich
ac
ce
s
s
is
g
iv
en
,
ex
p
ir
y
tim
estam
p
of
p
er
m
is
s
io
n
s
,
an
d
u
s
er
ty
p
e
(
g
u
est
or
s
ec
o
n
d
ar
y
)
.
d)
L
o
g
s
–
R
eg
u
lar
lo
g
d
etails
of
ev
er
y
ac
tio
n
th
at
tak
es
p
lace
on
ev
er
y
lo
c
k
in
th
e
s
y
s
tem
.
T
h
is
s
to
r
es
th
e
o
p
er
ated
lo
ck
’
s
lo
ck
I
D,
o
p
er
atin
g
u
s
er
’
s
u
s
er
n
am
e,
tim
estam
p
of
o
p
er
atio
n
,
ty
p
e
of
o
p
er
atio
n
(
l
o
ck
or
u
n
lo
ck
)
,
u
s
er
ty
p
e
(
o
wn
e
r
,
g
u
e
s
t
or
s
ec
o
n
d
ar
y
)
.
3
.
9
.
L
o
g
g
ing
a
nd
f
ilte
ring
da
t
a
T
h
e
m
o
b
ile
ap
p
licatio
n
allo
ws
th
e
lo
g
s
(
o
r
h
is
to
r
y
of
l
o
ck
o
p
er
atio
n
s
)
to
be
v
iewe
d
by
o
wn
er
s
an
d
s
ec
o
n
d
ar
y
o
wn
er
s
.
Fil
ter
in
g
c
an
be
b
ased
on
th
e
o
p
er
atio
n
ty
p
e
(
u
s
er
can
ch
o
o
s
e
to
v
iew
o
n
ly
lo
c
k
s
or
o
n
ly
u
n
lo
ck
s
or
b
o
th
)
,
u
s
er
n
am
e
of
th
e
o
p
er
atin
g
u
s
er
(
to
v
iew
all
th
e
o
p
er
atio
n
s
done
by
a
u
s
er
or
a
s
elec
ted
n
u
m
b
er
of
u
s
er
s
)
,
u
s
er
ty
p
e
(
t
o
v
iew
o
p
er
atio
n
s
d
o
n
e
by
o
n
ly
s
ec
o
n
d
ar
y
o
wn
e
r
s
or
o
n
ly
g
u
ests
)
,
lo
ck
ID
(
to
v
iew
o
p
er
atio
n
s
o
n
ly
f
o
r
a
p
ar
ticu
lar
lo
ck
)
.
T
h
ey
ca
n
also
s
p
ec
if
y
a
s
tar
t
an
d
e
n
d
tim
e
to
v
iew
th
e
o
p
er
atio
n
s
o
n
ly
b
etwe
en
p
a
r
ticu
lar
d
ates
or
tim
es.
T
h
ese
f
ilter
s
g
iv
e
t
h
e
u
s
er
s
an
ea
s
y
way
to
q
u
ic
k
ly
v
iew
p
ast
d
ata
a
n
d
is
v
er
y
h
elp
f
u
l
in
ca
s
e
a
s
ec
u
r
i
ty
is
s
u
e
h
as
to
be
in
v
esti
g
ated
.
3
.
1
0
.
Aut
hentic
a
t
io
n
a
nd
s
ec
urit
y
T
h
e
u
s
er
s
a
r
e
au
t
h
en
ticated
u
s
in
g
a
clo
u
d
au
th
en
ticatio
n
s
e
r
v
ice.
E
ac
h
u
s
er
can
o
n
l
y
s
ee
th
eir
o
wn
d
etails
v
ia
th
e
ap
p
licatio
n
an
d
h
en
ce
th
eir
d
etails
ar
e
not
ac
ce
s
s
ib
le
by
an
y
o
th
er
u
s
er
.
T
h
e
d
atab
ase
is
o
n
ly
ac
ce
s
s
ib
le
by
s
y
s
tem
s
on
th
e
s
am
e
n
etwo
r
k
.
Hen
ce
o
n
ly
th
e
b
ac
k
en
d
s
er
v
er
can
ac
ce
s
s
it.
T
h
e
d
atab
ase
is
o
n
ly
ac
ce
s
s
ib
le
by
au
t
h
en
tic
ated
u
s
er
s
an
d
by
p
r
o
v
id
in
g
r
eq
u
ir
ed
cr
ed
en
tials
an
d
p
a
s
s
wo
r
d
s
.
All
th
es
e
m
ea
s
u
r
es
ar
e
tak
en
to
s
ec
u
r
e
d
ata
an
d
p
r
e
v
en
t
th
ir
d
p
ar
t
y
ac
c
ess
or
h
ac
k
in
g
.
As
m
en
tio
n
ed
in
[
3
1
]
,
I
o
T
i
n
v
o
lv
es
a
h
u
g
e
am
o
u
n
t
of
d
ata
an
d
in
ev
er
y
I
o
T
p
r
o
ject
it
is
m
o
s
t
im
p
o
r
tan
t
to
m
ain
tain
s
y
s
tem
s
ec
u
r
ity
.
Am
o
n
g
s
ec
u
r
ity
att
ac
k
s
,
u
n
au
th
o
r
ized
u
s
e
is
v
er
y
co
m
m
o
n
an
d
th
e
p
r
o
p
o
s
ed
s
y
s
tem
p
r
ev
e
n
ts
th
e
p
o
s
s
ib
ilit
y
of
it.
4.
RE
SU
L
T
S
AND
D
I
SCU
SS
I
O
N
Mo
b
ile
ap
p
licatio
n
s
ar
e
u
s
ed
in
m
an
y
ex
p
er
im
en
ts
f
o
r
s
m
ar
t
door
lo
ck
s
as
in
[
3
2
]
,
[
3
3
]
an
d
it
is
v
er
y
im
p
o
r
tan
t
to
h
a
v
e
a
g
o
o
d
u
s
e
r
in
ter
f
ac
e.
T
h
e
p
r
o
p
o
s
ed
s
y
s
tem
’
s
m
o
b
ile
ap
p
licatio
n
is
d
e
v
elo
p
ed
in
a
cr
o
s
s
-
p
latf
o
r
m
f
r
am
ewo
r
k
so
th
at
it
can
r
u
n
on
all
m
o
b
ile
o
p
er
atin
g
s
y
s
tem
s
.
T
h
e
m
o
b
ile
a
p
p
lica
tio
n
is
s
u
cc
ess
f
u
lly
d
ev
elo
p
e
d
a
n
d
d
ep
lo
y
ed
,
an
d
is
co
m
p
letely
f
u
n
ctio
n
al.
Fig
u
r
e
3
s
h
o
ws
t
he
s
cr
ee
n
s
of
User
’
s
lo
ck
s
(
a)
,
L
o
c
k
o
p
er
atio
n
s
an
d
web
ca
m
o
p
tio
n
s
(
b
)
an
d
L
o
g
s
(
c
)
.
R
esp
o
n
s
e
tim
e
ex
p
er
im
en
ts
:
Fo
r
d
if
f
er
e
n
t
p
ar
ts
of
th
e
s
y
s
tem
,
ex
p
er
im
en
ts
wer
e
ca
r
r
i
ed
out
to
ap
p
r
o
x
im
ate
th
e
tim
e
tak
en
(
i
n
s
ec
o
n
d
s
)
f
o
r
th
e
f
lo
w
of
e
v
e
n
ts
to
o
cc
u
r
.
60
ex
p
e
r
im
en
ts
wer
e
co
n
d
u
cted
f
o
r
th
r
ee
s
ce
n
ar
io
s
an
d
T
ab
le
1
h
o
ld
s
an
an
aly
s
is
of
th
e
s
tu
d
ies.
E
x
p
er
im
en
tal
c
o
n
d
itio
n
s
:
T
h
e
s
er
v
er
is
h
o
s
ted
on
th
e
clo
u
d
,
with
an
in
s
tan
ce
of
I
n
tel
AVX
(
I
n
tel
T
u
r
b
o
)
,
with
1
GiB
m
em
o
r
y
an
d
s
in
g
le
v
ir
t
u
al
ce
n
tr
al
p
r
o
ce
s
s
in
g
u
n
it
.
T
h
e
n
etwo
r
k
p
er
f
o
r
m
an
ce
of
th
e
in
s
tan
ce
is
lo
w
to
m
o
d
er
ate
a
n
d
s
tead
y
in
ter
n
et
c
o
n
n
ec
tio
n
of
70
to
1
0
0
Mb
p
s
was
ch
o
s
en
.
T
ab
le
1
is
m
ad
e
by
ca
lcu
latin
g
th
e
av
e
r
ag
e
v
al
u
es
of
all
th
e
ex
p
er
im
en
ts
f
o
r
ev
er
y
s
ce
n
ar
io
.
E
x
p
er
im
en
ts
s
h
o
w
th
at
th
e
o
p
er
atio
n
wh
ich
tak
es
m
ax
im
u
m
tim
e
is
wh
en
a
g
u
est
u
s
er
p
er
f
o
r
m
s
a
lo
ck
/u
n
lo
c
k
an
d
th
e
u
s
er
’
s
p
h
o
n
e
B
L
E
UUI
D
is
s
ca
n
n
e
d
.
T
ab
le
2
s
h
o
ws
an
a
n
aly
s
is
of
t
h
e
p
o
s
s
ib
le
r
ea
s
o
n
s
f
o
r
f
ailu
r
e
in
th
e
e
x
p
er
im
e
n
ts
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
9
-
4
8
6
4
I
n
t J Reco
n
f
ig
u
r
a
b
le
&
E
m
b
ed
d
ed
Sy
s
t,
Vo
l.
10
,
No
.
3
,
No
v
em
b
er
2
0
2
1
:
176
–
18
5
182
(
a)
(
b
)
(
c)
Fig
u
r
e
3.
AC
C
E
SS
m
o
b
ile
ap
p
licatio
n
: (
a)
User
’
s
lo
ck
s
,
(
b
)
L
o
ck
o
p
er
atio
n
s
an
d
web
ca
m
o
p
tio
n
s
,
(
c)
L
o
g
s
T
ab
le
1
.
R
esp
o
n
s
e
tim
e
an
aly
s
is
S
t
a
r
t
S
e
q
u
e
n
c
e
O
p
e
r
a
t
i
o
n
O
p
e
r
a
t
i
o
n
t
i
me
Ti
me
t
a
k
e
n
To
t
a
l
Ti
me
(
1
)
S
c
e
n
a
r
i
o
:
D
o
o
r
b
e
l
l
d
e
t
e
c
t
i
o
n
a
n
d
v
i
d
e
o
c
o
m
mu
n
i
c
a
t
i
o
n
1
.
3
0
s
V
i
si
t
o
r
p
r
e
sses
d
o
o
r
b
e
l
l
(
0
:
0
0
h
r
s)
1
(
a
)
Pi
d
e
t
e
c
t
s
0
:
0
0
.
0
1
h
r
s
0
.
0
1
s
1
(
b
)
V
i
si
t
o
r
’
s
s
n
a
p
sh
o
t
t
a
k
e
n
0
:
0
0
.
0
2
h
r
s
1
.
0
1
s
(
f
r
o
m
1
a
)
S
n
a
p
sh
o
t
u
p
l
o
a
d
e
d
to
c
l
o
u
d
0
:
0
1
.
0
2
h
r
s
1
(
b
)
Pi
p
u
b
l
i
sh
e
s
d
a
t
a
to
M
Q
TT
t
o
p
i
c
0
:
0
1
.
1
0
h
r
s
1
.
0
9
s
(
f
r
o
m
1
a
)
1
(
c
)
R
e
q
u
e
st
f
r
o
m
t
o
p
i
c
to
ser
v
e
r
0
:
0
1
.
1
1
h
r
s
0
.
0
1
s
(
f
r
o
m
1
b
)
1
(
d
)
N
o
t
i
f
i
c
a
t
i
o
n
on
m
o
b
i
l
e
a
p
p
l
i
c
a
t
i
o
n
0
:
0
1
.
2
0
h
r
s
0
.
0
9
s
1
(
e
)
U
ser
o
p
e
n
s
a
p
p
l
i
c
a
t
i
o
n
0
:
0
1
.
2
0
h
r
s
A
l
mo
s
t
i
n
s
t
a
n
t
l
y
1
(f)
U
ser
c
l
i
c
k
s
“
S
t
a
r
t
W
e
b
c
a
m
”
o
p
t
i
o
n
0
:
0
1
.
2
0
h
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su
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t
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s
c
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d
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s
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t
f
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d
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p
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In
th
e
wo
r
k
s
of
[
3
4
]
,
th
e
d
atab
ase
h
as
b
ee
n
b
ased
on
No
SQL
wh
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e
d
ata
is
s
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ed
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k
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h
e
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ed
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y
s
tem
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s
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Po
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tg
r
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wh
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o
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id
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elatio
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le
s
tr
u
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r
e
in
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ield
s
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be
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ar
ies
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ar
r
ay
s
an
d
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en
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we
ca
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s
to
r
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d
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k
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d
ata.
As
co
m
p
ar
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to
th
e
r
esu
lts
of
[
3
4
]
,
th
e
p
r
o
p
o
s
ed
s
y
s
tem
p
r
o
d
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ce
s
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aster
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ase
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s
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.
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ev
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y
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al
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o
d
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le
is
co
m
p
leted
b
etwe
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2
s
ec
o
n
d
s
.
Mo
s
t
r
ea
s
o
n
s
of
f
ailu
r
e
ar
e
r
elate
d
to
in
ter
n
et
c
o
n
n
ec
tiv
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wh
ich
is
one
d
ep
e
n
d
en
cy
of
th
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s
y
s
tem
to
f
u
n
cti
o
n
in
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n
lin
e
m
o
d
e.
T
h
is
is
also
th
e
r
ea
s
o
n
wh
y
th
e
o
f
f
lin
e
m
ec
h
an
is
m
s
h
av
e
b
ee
n
in
clu
d
ed
to
m
ak
e
s
u
r
e
th
e
s
y
s
tem
is
not
d
ep
en
d
e
n
t
on
in
ter
n
et
f
o
r
its
b
asic
r
eq
u
ir
em
en
t.
T
h
is
also
m
ea
n
s
th
at
th
e
clo
u
d
s
er
v
ice
an
d
tier
of
s
er
v
ice
s
h
o
u
ld
be
ch
o
s
en
v
e
r
y
ca
r
ef
u
lly
to
m
ak
e
s
u
r
e
th
e
s
er
v
er
’
s
n
et
wo
r
k
in
g
an
d
p
r
o
ce
s
s
in
g
ca
p
ac
ities
ar
e
en
o
u
g
h
to
s
u
p
p
o
r
t
s
m
o
o
th
f
u
n
ctio
n
in
g
.
T
h
e
d
atab
ase
also
n
ee
d
s
to
be
well
ch
o
s
en
b
ec
a
u
s
e
s
p
en
d
of
r
ea
d
an
d
wr
ite
o
p
er
atio
n
s
d
e
p
en
d
lar
g
ely
on
t
h
e
d
atab
ase
s
er
v
er
p
r
o
ce
s
s
in
g
.
Hen
ce
,
th
e
p
r
o
p
o
s
ed
s
y
s
tem
is
a
s
tep
to
war
d
s
d
ev
elo
p
in
g
a
s
m
ar
t
home
s
in
ce
I
o
T
is
b
ein
g
wid
ely
u
s
ed
f
o
r
s
m
ar
t
s
y
s
tem
s
[
3
5
]
,
[
3
6
]
.
T
h
is
p
r
o
ject
can
be
i
m
p
r
o
v
e
d
by
th
e
ad
d
itio
n
of
s
o
m
e
f
ea
tu
r
es.
T
h
e
d
o
o
r
b
ell
d
etec
tio
n
can
be
i
n
te
g
r
ated
with
th
e
d
o
o
r
b
ell
of
th
e
h
o
u
s
e
in
p
lace
of
t
h
e
ad
d
itio
n
al
s
witch
.
Fu
r
th
er
,
th
e
h
ar
d
war
e
co
m
p
o
n
e
n
ts
can
be
s
ca
led
d
o
wn
to
s
m
aller
s
ize
s
to
en
h
an
ce
co
m
p
ac
tn
ess
.
A
well
-
d
esig
n
ed
PC
B
will
m
ak
e
th
e
ap
p
ea
r
an
ce
e
v
en
b
etter
.
T
h
e
ap
p
licatio
n
ca
n
be
m
a
d
e
m
o
r
e
s
ec
u
r
e
with
f
ac
ial
r
ec
o
g
n
itio
n
wh
ich
is
th
e
b
ase
of
th
e
ex
p
e
r
im
en
t
in
[
3
7
]
,
[
3
8
]
.
T
h
er
e
ca
n
also
be
an
ad
d
itio
n
al
n
o
tifi
ca
tio
n
p
r
o
ce
s
s
v
ia
SMS
to
en
s
u
r
e
th
e
o
wn
er
is
n
o
tifie
d
ev
en
if
h
is
in
ter
n
et
is
not
tu
r
n
e
d
on
[
3
9
]
.
An
in
ter
es
tin
g
ad
d
itio
n
wo
u
ld
be
a
g
estu
r
e
r
ec
o
g
n
itio
n
s
y
s
te
m
f
o
r
o
f
f
lin
e
ac
ce
s
s
as
d
ep
icted
in
[
4
0
]
th
r
o
u
g
h
v
ir
tu
al
r
ea
l
ity
m
eth
o
d
s
wh
er
e
lo
ck
o
p
e
n
in
g
h
an
d
g
estu
r
es
ca
n
co
n
tr
o
l
th
e
lo
ck
s
.
5.
CO
NCLU
SI
O
N
T
h
e
p
r
o
ject
can
be
d
ep
lo
y
ed
in
h
o
u
s
eh
o
l
d
s
,
ed
u
ca
tio
n
al
in
s
titu
tio
n
s
an
d
wo
r
k
p
lace
s
wh
er
e
p
eo
p
le
ar
e
s
ea
r
ch
in
g
f
o
r
m
eth
o
d
s
to
ad
d
s
p
ee
d
an
d
c
o
n
v
e
n
ien
ce
to
th
eir
life
s
ty
les.
An
y
r
eg
io
n
put
u
n
d
e
r
lo
ck
an
d
k
ey
can
u
s
e
th
is
s
y
s
tem
.
I
o
T
h
as
b
ee
n
u
s
ed
f
o
r
m
o
n
ito
r
i
n
g
s
e
n
s
o
r
s
an
d
s
m
ar
t
h
o
m
es
as
d
ep
i
cted
in
wo
r
k
s
.
T
h
e
v
astes
t
ap
p
licatio
n
of
t
h
e
p
r
o
p
o
s
ed
s
y
s
tem
is
t
h
at
of
h
o
u
s
e
h
o
ld
s
s
in
ce
t
h
e
d
o
o
r
s
ar
e
ac
ce
s
s
ed
m
u
ltip
le
tim
es
on
a
r
eg
u
la
r
b
asis
an
d
t
h
e
p
r
o
b
lem
of
b
ein
g
away
f
r
o
m
h
o
m
e
wh
en
v
is
ito
r
s
ar
r
iv
e
is
r
at
h
er
co
m
m
o
n
.
Ap
ar
t
f
r
o
m
t
h
is
,
m
ac
h
in
e
r
y
,
s
to
r
ag
e
cu
p
b
o
a
r
d
s
an
d
r
o
o
m
s
,
a
n
d
a
p
p
lian
ce
s
can
also
be
co
n
t
r
o
lled
by
th
e
s
am
e.
In
th
e
ca
s
e
of
a
door
it
is
a
lo
ck
,
an
d
in
th
e
ca
s
e
of
co
m
p
u
ter
s
y
s
tem
s
of
m
ac
h
in
er
y
it
is
th
e
p
o
wer
s
u
p
p
ly
.
E
s
p
ec
ially
f
o
r
eld
er
l
y
citizen
s
,
a
more
s
ec
u
r
e
way
of
m
o
n
ito
r
in
g
en
tr
ies
a
n
d
ex
its
to
an
d
f
r
o
m
th
e
h
o
u
s
e
will
p
r
o
v
e
to
be
b
en
e
f
icial
f
o
r
th
eir
s
af
ety
.
As
e
x
p
lain
ed
in
th
e
p
a
p
er
,
t
h
e
p
r
o
p
o
s
ed
s
y
s
tem
aim
s
at
o
v
er
co
m
in
g
th
e
d
r
awb
ac
k
s
of
ex
is
tin
g
s
y
s
tem
an
d
also
aim
s
at
m
ak
in
g
im
p
r
o
v
em
en
ts
by
im
p
lem
en
tin
g
s
o
m
e
n
ew
ap
p
r
o
ac
h
es
s
u
g
g
ested
by
s
o
m
e
of
th
e
r
elat
ed
wo
r
k
s
.
RE
F
E
R
E
NC
E
S
[1
]
Y.
T.
P
a
rk
,
P
.
S
t
h
a
p
it
a
n
d
J.
P
y
u
n
,
"
S
m
a
rt
d
i
g
it
a
l
d
o
o
r
lo
c
k
fo
r
t
h
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h
o
m
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u
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m
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ti
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,
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T
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0
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5
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]
G
.
K
.
V
e
rm
a
a
n
d
P
.
Tri
p
a
t
h
i
,
"
A
d
ig
it
a
l
se
c
u
rit
y
sy
ste
m
with
d
o
o
r
lo
c
k
sy
ste
m
u
sin
g
RF
I
D
tec
h
n
o
lo
g
y
,
"
In
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
o
f
C
o
mp
u
ter
Ap
p
l
ica
ti
o
n
s
,
v
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l.
5
,
n
o
.
1
1
,
p
p
.
6
–
8
,
2
0
1
0
,
d
o
i:
1
0
.
5
1
2
0
/
9
5
7
-
1
3
3
4
.
[3
]
K.
G
il
l,
S
.
-
H.
Ya
n
g
,
F
.
Ya
o
a
n
d
X.
Lu
,
"
A
z
i
g
b
e
e
-
b
a
se
d
h
o
m
e
a
u
to
m
a
ti
o
n
s
y
ste
m
,
"
in
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
Co
n
su
me
r E
lec
tro
n
ics
,
v
o
l.
5
5
,
n
o
.
2
,
p
p
.
4
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2
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0
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a
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2
0
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:
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1
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0
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CE.
2
0
0
9
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4
4
0
3
.
[4
]
C.
Hu
n
g
,
Y.
Ba
i
a
n
d
J.
Re
n
,
"
De
sig
n
a
n
d
imp
lem
e
n
tati
o
n
o
f
a
d
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l
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c
k
c
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tro
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b
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se
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o
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field
c
o
m
m
u
n
ica
ti
o
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o
f
a
sm
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rtp
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,
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2
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5
IE
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ter
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a
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El
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.
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]
M
.
A.
Ka
d
e
r,
M
.
Y
.
Ha
id
e
r,
M
.
R.
Ka
rim,
M
.
S
.
Isla
m
a
n
d
M
.
M
.
Ud
d
in
,
"
De
si
g
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a
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d
imp
lem
e
n
ta
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o
f
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it
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b
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c
k
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m
u
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g
fi
n
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e
rp
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in
t.
,
"
2
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6
In
ter
n
a
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a
l
Co
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n
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In
n
o
v
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s
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S
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En
g
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(ICI
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)
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I
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[6
]
N.
A
An
u
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a
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d
D.
Bh
a
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a
,
"
A
sm
a
rt
d
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ss
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rp
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,"
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n
ter
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r
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M
e
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En
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In
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[7
]
J
.
Ch
a
ik
i
n
a
n
d
S
.
Ke
n
ter,
“
Bi
o
m
e
tri
c
lo
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k
”
,
L
e
g
a
l
Pa
ten
t,
U
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it
e
d
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a
tes
,
US
1
2
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1
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6
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2
0
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.
[8
]
A.
B
.
Th
a
b
e
t
a
n
d
N.
B
.
Am
o
r,
"
E
n
h
a
n
c
e
d
sm
a
rt
d
o
o
rb
e
ll
sy
ste
m
b
a
se
d
o
n
fa
c
e
re
c
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n
it
i
o
n
,
"
2
0
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1
6
th
In
ter
n
a
t
io
n
a
l
Co
n
fer
e
n
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S
c
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e
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n
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T
e
c
h
n
iq
u
e
s
o
f
Au
to
m
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ti
c
Co
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tro
l
a
n
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Co
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ter
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[9
]
M
.
S
a
h
a
n
i
,
C.
Na
n
d
a
,
A
.
K.
S
a
h
u
a
n
d
B.
P
a
tt
n
a
i
k
,
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Web
-
b
a
se
d
o
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e
m
b
e
d
d
e
d
d
o
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a
c
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se
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rit
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fa
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it
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,
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2
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5
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n
ter
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a
t
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l
Co
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fer
e
n
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C
irc
u
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s,
Po
we
r
a
n
d
C
o
mp
u
ti
n
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T
e
c
h
n
o
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o
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ies
[
ICCPCT
-
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,
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.
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M
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.
Ja
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u
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S
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a
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n
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.
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e
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,
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u
sin
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3
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In
ter
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a
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fer
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Ad
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s
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Co
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s
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[1
1
]
D.
Ha
n
,
H.
Kim
a
n
d
J.
Ja
n
g
,
"
Blo
c
k
c
h
a
in
b
a
se
d
sm
a
rt
d
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r
l
o
c
k
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m
,
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2
0
1
7
In
ter
n
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ti
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Co
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n
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e
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In
fo
rm
a
t
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a
n
d
Co
mm
u
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ica
ti
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T
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(ICT
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2
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2
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[1
2
]
C.
Vo
n
g
c
h
u
m
y
e
n
e
t
a
l.
,
"
Do
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m
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we
b
a
p
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a
ti
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n
,
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2
0
1
7
I
n
ter
n
a
t
io
n
a
l
El
e
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trica
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E
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g
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2
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5
9
0
9
.
[1
3
]
M
.
P
re
ss
o
,
D.
S
c
a
fa
ti
,
J.
M
a
ro
n
e
a
n
d
E
.
T
o
d
o
ro
v
ich
,
"
De
sig
n
o
f
a
sm
a
rt
lo
c
k
o
n
t
h
e
G
a
li
leo
b
o
a
r
d
,
"
2
0
1
7
Ei
g
h
t
Arg
e
n
ti
n
e
S
y
mp
o
si
u
m
a
n
d
C
o
n
f
e
re
n
c
e
o
n
Emb
e
d
d
e
d
S
y
ste
ms
(CAS
E)
,
2
0
1
7
,
p
p
.
1
-
6
,
d
o
i:
1
0
.
2
3
9
1
9
/S
ASE
-
CASE
.
2
0
1
7
.
8
1
1
5
3
7
8
.
[1
4
]
R
.
S
a
t
o
sk
a
r
a
n
d
A
.
M
ish
ra
,
"
S
m
a
rt
d
o
o
r
l
o
c
k
a
n
d
l
ig
h
ti
n
g
sy
ste
m
u
sin
g
in
tern
e
t
o
f
th
i
n
g
s
,
"
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
Co
mp
u
ter
S
c
ien
c
e
a
n
d
I
n
fo
rm
a
ti
o
n
T
e
c
h
n
o
l
o
g
y
,
v
o
l
.
9,
n
o
.
5
,
p
p
.
1
3
2
-
1
3
5
,
2
0
1
8
.
[1
5
]
V.
Vu
jo
v
ić
a
n
d
M
.
M
a
k
sim
o
v
ić
,
"
Ra
sp
b
e
rr
y
P
i
a
s
a
se
n
so
r
we
b
n
o
d
e
f
o
r
h
o
m
e
a
u
to
m
a
ti
o
n
”
Co
mp
u
ter
s
a
n
d
El
e
c
trica
l
En
g
in
e
e
rin
g
,
v
o
l
.
44
,
p
p
.
1
5
3
-
1
7
1
,
2
0
1
5
,
d
o
i:
1
0
.
1
0
1
6
/j
.
c
o
m
p
e
lec
e
n
g
.
2
0
1
5
.
0
1
.
0
1
9
.
[1
6
]
A.
Ib
ra
h
im,
A.
P
a
ra
v
a
th
,
P
.
K.
As
win
,
S
.
M
.
I
q
b
a
l
a
n
d
S
.
U.
Ab
d
u
l
la,
"
G
S
M
b
a
se
d
d
ig
i
tal
d
o
o
r
lo
c
k
se
c
u
rit
y
sy
ste
m
,
"
2
0
1
5
I
n
ter
n
a
t
io
n
a
l
C
o
n
f
e
re
n
c
e
o
n
Po
we
r,
In
stru
me
n
t
a
ti
o
n
,
Co
n
tro
l
a
n
d
Co
mp
u
ti
n
g
(PI
CC
)
,
2
0
1
5
,
p
p
.
1
-
6
,
doi
:
1
0
.
1
1
0
9
/P
ICC.
2
0
1
5
.
7
4
5
5
7
9
6
.
[1
7
]
S
.
Ja
in
,
A.
Va
i
b
h
a
v
a
n
d
L.
G
o
y
a
l,
"
Ra
sp
b
e
rry
P
i
b
a
se
d
in
tera
c
ti
v
e
h
o
m
e
a
u
t
o
m
a
ti
o
n
sy
ste
m
t
h
ro
u
g
h
E
-
m
a
il
,
"
2
0
1
4
In
tern
a
ti
o
n
a
l
C
o
n
fe
re
n
c
e
o
n
Re
li
a
b
il
it
y
Op
ti
m
iza
ti
o
n
a
n
d
I
n
fo
rm
a
ti
o
n
Tec
h
n
o
lo
g
y
(ICROIT),
2
0
1
4
,
p
p
.
2
7
7
-
2
8
0
,
d
o
i:
1
0
.
1
1
0
9
/ICROIT.
2
0
1
4
.
6
7
9
8
3
3
0
.
[1
8
]
A
.
Da
v
id
O.,
M
.
Ch
i
n
a
z
a
a
n
d
O
.
Jo
th
a
m
O.,
"
De
sig
n
a
n
d
im
p
lem
e
n
tatio
n
o
f
a
d
o
o
r
lo
c
k
i
n
g
sy
ste
m
u
sin
g
a
n
d
r
o
i
d
a
p
p
,
"
In
ter
n
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
S
c
i
e
n
ti
fi
c
&
T
e
c
h
n
o
l
o
g
y
Res
e
a
rc
h
,
v
o
l
.
6
,
n
o
.
8
,
p
p
.
1
9
8
-
2
0
3
,
2
0
1
7
.
[1
9
]
J
.
Da
b
h
a
d
e
,
A
.
Ja
v
a
re
,
T
.
G
h
a
y
a
l
,
A.
S
h
e
lar
,
a
n
d
A.
G
u
p
ta
,
“
S
m
a
rt
d
o
o
r
lo
c
k
s
y
ste
m
:
imp
ro
v
in
g
h
o
m
e
se
c
u
rit
y
u
sin
g
Blu
e
t
o
o
t
h
tec
h
n
o
l
o
g
y
,
"
In
te
rn
a
ti
o
n
a
l
J
o
u
rn
a
l
o
f
Co
m
p
u
ter
A
p
p
li
c
a
ti
o
n
s
,
v
o
l
.
1
6
0
,
n
o
.
8
,
p
p
.
1
9
-
2
2
,
2
0
1
7
[2
0
]
L
.
K
.
Bh
u
te,
G
.
S
in
g
h
,
A
.
S
i
n
g
h
,
a
n
d
V
.
Ka
n
sa
ry
,
"
Au
to
m
a
ti
c
d
o
o
r
lo
c
k
i
n
g
s
y
ste
m
u
sin
g
Blu
e
to
o
t
h
m
o
d
u
le
”
,
In
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
f
o
r
Res
e
a
rc
h
in
A
p
p
l
ied
S
c
ie
n
c
e
a
n
d
En
g
i
n
e
e
rin
g
T
e
c
h
n
o
lo
g
y
,
v
o
l.
5
,
n
o
.
5
,
p
p
.
1
1
2
8
-
1
1
3
2
,
2
0
1
7
[2
1
]
M
.
A.
P
ra
d
a
-
De
lg
a
d
o
,
A.
Vá
z
q
u
e
z
-
Re
y
e
s
a
n
d
I.
Ba
tu
ro
n
e
,
"
P
h
y
sic
a
l
u
n
c
lo
n
a
b
l
e
k
e
y
s
fo
r
sm
a
rt
l
o
c
k
sy
ste
m
s
u
si
n
g
Blu
e
to
o
th
L
o
w
E
n
e
rg
y
,
"
IECON
2
0
1
6
-
4
2
n
d
A
n
n
u
a
l
C
o
n
fer
e
n
c
e
o
f
th
e
I
EE
E
In
d
u
stri
a
l
El
e
c
tro
n
ic
s
S
o
c
iety
,
2
0
1
6
,
p
p
.
4
8
0
8
-
4
8
1
3
,
d
o
i:
1
0
.
1
1
0
9
/IE
C
ON
.
2
0
1
6
.
7
7
9
2
9
5
5
.
[2
2
]
V.
Vu
jo
v
ić an
d
M
.
M
a
k
sim
o
v
ić,
"
Ra
sp
b
e
rry
P
i
a
s a
wire
les
s se
n
s
o
r
n
o
d
e
:
P
e
rfo
rm
a
n
c
e
s a
n
d
c
o
n
stra
in
ts,"
2
0
1
4
3
7
th
In
ter
n
a
t
io
n
a
l
Co
n
v
e
n
ti
o
n
o
n
In
fo
rm
a
ti
o
n
a
n
d
C
o
mm
u
n
ica
ti
o
n
T
e
c
h
n
o
l
o
g
y
,
El
e
c
tro
n
ics
a
n
d
M
icr
o
e
lec
tro
n
ics
(M
IPR
O)
,
2
0
1
4
,
p
p
.
1
0
1
3
-
1
0
1
8
,
d
o
i:
1
0
.
1
1
0
9
/
M
IP
RO.
2
0
1
4
.
6
8
5
9
7
1
7
.
[2
3
]
S
.
Ch
a
rk
a
o
u
i,
Z.
A
d
ra
o
u
i
a
n
d
E
.
H.
Be
n
lah
m
a
r,
"
Cro
ss
-
p
latf
o
rm
m
o
b
il
e
d
e
v
e
lo
p
m
e
n
t
a
p
p
r
o
a
c
h
e
s,"
2
0
1
4
T
h
ird
IEE
E
I
n
ter
n
a
t
io
n
a
l
Co
l
lo
q
u
i
u
m
in
In
f
o
rm
a
ti
o
n
S
c
ie
n
c
e
a
n
d
T
e
c
h
n
o
l
o
g
y
(CIS
T
)
,
2
0
1
4
,
p
p
.
1
8
8
-
1
9
1
,
d
o
i:
1
0
.
1
1
0
9
/CI
S
T.
2
0
1
4
.
7
0
1
6
6
1
6
.
[2
4
]
A.
Je
stra
tj
e
w
a
n
d
A.
Kw
iec
ien
,
"
P
e
rfo
rm
a
n
c
e
o
f
H
TT
P
p
r
o
to
c
o
l
in
n
e
two
rk
e
d
c
o
n
tr
o
l
sy
ste
m
s
,
"
in
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
In
d
u
stri
a
l
I
n
fo
rm
a
ti
c
s
,
v
o
l.
9
,
n
o
.
1
,
p
p
.
2
7
1
-
2
7
6
,
F
e
b
.
2
0
1
3
,
d
o
i
:
1
0
.
1
1
0
9
/T
II
.
2
0
1
2
.
2
1
8
3
1
3
8
.
[2
5
]
U.
Hu
n
k
e
ler,
H.
L.
Tr
u
o
n
g
a
n
d
A.
S
tan
f
o
rd
-
Clar
k
,
"
M
QTT
-
S
—
A
p
u
b
li
sh
/su
b
sc
rib
e
p
ro
to
c
o
l
fo
r
wi
re
les
s
se
n
so
r
n
e
two
rk
s,
"
2
0
0
8
3
rd
In
ter
n
a
ti
o
n
a
l
Co
n
fer
e
n
c
e
o
n
Co
mm
u
n
ica
ti
o
n
S
y
ste
ms
S
o
ft
wa
re
a
n
d
M
i
d
d
lewa
re
a
n
d
W
o
rk
sh
o
p
s (COM
S
W
AR
E
'
0
8
)
,
2
0
0
8
,
p
p
.
7
9
1
-
7
9
8
,
d
o
i:
1
0
.
1
1
0
9
/C
OMS
WA.
2
0
0
8
.
4
5
5
4
5
1
9
.
[2
6
]
B
.
K.
Clark
,
E
.
A.
Wi
n
k
ler
,
C
.
L.
Bra
k
e
n
rid
g
e
,
S
.
G
.
Tro
st
a
n
d
G
.
N.
He
a
l
,
"
Us
in
g
Blu
e
t
o
o
t
h
p
r
o
x
i
m
it
y
se
n
sin
g
to
d
e
term
in
e
wh
e
re
o
ffice
wo
rk
e
rs
sp
e
n
d
ti
m
e
at
wo
rk
,
"
PL
OS
On
e
,
v
o
l
.
1
3
,
n
o
.
3
,
p
.
e
0
1
9
3
9
7
1
,
2
0
1
8
,
d
o
i
:
1
0
.
1
3
7
1
/
jo
u
rn
a
l.
p
o
n
e
.
0
1
9
3
9
7
1
.
[2
7
]
S
.
Ka
v
d
e
,
R.
Ka
v
d
e
,
S
.
Bo
d
a
re
a
n
d
G
.
Bh
a
g
a
t,
"
S
m
a
rt
d
ig
i
tal
d
o
o
r
lo
c
k
s
y
ste
m
u
sin
g
Bl
u
e
to
o
th
tec
h
n
o
lo
g
y
,
"
2
0
1
7
In
ter
n
a
t
io
n
a
l
Co
n
fer
e
n
c
e
o
n
I
n
f
o
rm
a
ti
o
n
Co
mm
u
n
ica
ti
o
n
a
n
d
E
mb
e
d
d
e
d
S
y
ste
ms
(ICICE
S
)
,
2
0
1
7
,
p
p
.
1
-
4
,
d
o
i
:
1
0
.
1
1
0
9
/ICIC
ES
.
2
0
1
7
.
8
0
7
0
7
8
8
.
[2
8
]
D
.
C
.
Al
u
ri
,
"
S
m
a
rt
l
o
c
k
s
y
ste
m
s
:
An
ove
rv
iew
,
"
I
n
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
of
C
o
mp
u
ter
Ap
p
li
c
a
ti
o
n
s
,
v
o
l
.
1
7
7
,
no
.
37,
p
p
.
4
0
-
4
3
,
2
0
2
0
,
d
o
i:
1
0
.
5
1
2
0
/
ij
c
a
2
0
2
0
9
1
9
8
8
2
.
[2
9
]
H
.
Aln
a
b
h
i,
Y
.
Al
-
Na
a
m
a
n
i
,
M
.
Al
-
M
a
d
h
e
h
a
g
i
a
n
d
M
.
Al
h
a
m
z
i,
"
En
h
a
n
c
e
d
se
c
u
rit
y
m
e
th
o
d
s
of
d
o
o
r
lo
c
k
in
g
b
a
se
d
fin
g
e
rp
r
in
t
,
"
I
n
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
of
I
n
n
o
v
a
ti
v
e
T
e
c
h
n
o
l
o
g
y
a
n
d
E
x
p
lo
rin
g
E
n
g
i
n
e
e
rin
g
(IJ
IT
EE
)
,
v
o
l
.
9,
n
o
.
3,
pp
.
1
1
7
3
-
1
1
7
8
,
2
0
2
0
,
d
o
i:
1
0
.
3
5
9
4
0
/
i
ji
tee
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