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3
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20
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p
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i
m
p
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I
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titu
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Eng
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a
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Sc
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nc
e
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All
righ
t
s
re
s
e
rve
d.
1.
Int
r
o
d
u
ctio
n
S
m
art
S
w
i
tc
hb
o
ard
S
y
s
tem
i
s
an
i
n
tel
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t,
en
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on
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c
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ou
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wi
th
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i
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bl
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on
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tor
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on
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b
y
ap
pl
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an
c
es
an
d
a
l
s
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a
l
l
o
w
s
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us
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to
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on
tr
ol
tho
s
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el
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tr
i
c
a
l
ap
p
l
i
an
c
es
f
r
o
m
an
y
wh
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i
n
t
he
wor
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d
us
i
ng
a
s
m
artpho
ne
or
m
ob
i
l
e
de
v
i
c
e
i
nte
r
f
ac
e
[
1].
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c
an
po
wer
up
t
o
s
i
x
d
i
f
f
erent
ap
pl
i
an
c
es
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he
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na
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y
d
ev
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c
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r
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thu
s
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ad
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s
m
art
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ate
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c
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en
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hi
s
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t
he
m
on
thl
y
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tr
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c
al
b
i
l
l
s
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nd
m
ak
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the
pl
an
e
t
a
gree
ne
r
p
l
ac
e
t
o
l
i
v
e.
O
u
r
S
m
art
S
w
i
tc
hb
o
ard
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s
ab
l
e
to
c
on
tr
ol
up
t
o
s
i
x
di
f
f
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a
pp
l
i
a
nc
es
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ho
s
e
ho
us
e
ho
l
d
ap
p
l
i
an
c
es
w
i
l
l
c
on
n
ec
t
t
o
th
e
s
wi
tc
h
m
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i
nc
l
ud
es
an
y
s
ort
of
m
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ul
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whi
c
h
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ha
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ge
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ts
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s
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t
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o
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as
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t
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f
l
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ul
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as
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ted
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th
th
e
ga
dg
et
s
uc
h
tha
t
when
i
t
c
ha
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es
the
ex
pre
s
s
,
the
c
on
di
ti
on
of
f
a
m
i
l
y
un
i
t
g
ad
g
et
i
nt
erf
ac
es
w
i
th
i
t
w
i
l
l
l
i
k
ewi
s
e
c
ha
ng
e
.
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r
an
s
f
ers
c
an
be
uti
l
i
z
ed
as
a
s
w
i
tc
h
m
od
ul
e.
It
i
s
a
n
el
ec
tr
om
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ti
c
ga
d
ge
t
or
r
eg
ul
arl
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c
al
l
e
d
as
h
an
d
-
o
ff
s
w
i
tc
h.
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s
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arates
t
wo
c
i
r
c
ui
ts
e
l
ec
tr
i
c
a
l
l
y
a
nd
i
n
terf
ac
es
the
m
att
r
ac
ti
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e
l
y
.
In
es
s
en
t
i
al
tr
an
s
f
er
the
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e
ar
e
thre
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c
o
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c
tors
w
h
i
c
h
ar
e
t
y
pi
c
al
l
y
O
pe
n
(
NO
)
,
ordi
n
aril
y
s
hu
t
(
NC)
,
an
d
n
orm
al
(
CO
M).
CO
M
i
s
t
y
pi
c
al
l
y
as
s
oc
i
at
ed
wi
th
th
e
N
C.
A
t
ord
i
na
r
y
c
on
di
t
i
o
n
when
f
am
i
l
y
u
ni
t
ga
dg
ets
i
s
no
t
i
n
w
ork
i
ng
m
od
e
the
n
ha
n
d
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of
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i
s
on
NO
s
tat
e.
W
he
n
i
t
ge
ts
f
l
ag
th
en
i
t
c
h
an
ge
s
t
he
s
tat
e
t
o
N
C
a
nd
the
ga
dg
et
w
i
l
l
ge
t
o
n
wor
k
i
ng
s
t
ate
[
6].
S
wi
tc
h
Mo
du
l
e
wi
l
l
as
s
oc
i
at
e
w
i
t
h
the
S
m
art
Mi
c
r
oc
on
tr
o
l
l
er.
I
t
wi
l
l
go
a
bo
u
t
as
i
nt
erf
ac
e
ga
dg
e
t
be
t
w
e
en
f
am
i
l
y
u
ni
t
ga
dg
et
s
an
d C
l
ou
d
S
erv
er.
Us
i
ng
a
s
m
artpho
ne
we
c
an
i
ns
tan
t
l
y
k
no
w
th
e
w
e
a
the
r
c
on
d
i
ti
on
of
Lo
nd
o
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or
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s
toc
k
s
an
d
o
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l
pric
es
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n
US
m
ar
k
et
or
m
a
k
e
a
v
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d
eo
c
al
l
to
ou
r
f
am
i
l
y
an
d
f
r
i
en
d
s
an
y
where
on
the
gl
o
be
.
B
ut
we
c
an
no
t
c
on
tr
ol
th
e
e
l
ec
tr
i
c
a
l
de
v
i
c
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pres
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n
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r
ho
m
e/o
f
f
i
c
e
on
c
e
w
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are
ou
t
of
the
bu
i
l
d
i
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g.
W
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d
on
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m
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tr
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c
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l
ap
pl
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n
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ho
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c
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ha
v
e
no
wa
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to
k
no
w
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d
s
wi
tc
h
O
F
F
a
l
i
gh
t
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l
b
or
a
w
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m
a
c
hi
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ai
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c
on
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ti
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tha
t
i
s
l
ef
t
O
N
af
ter
s
om
eb
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y
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e
av
e
s
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r
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.
W
e
c
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no
t
s
et
p
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w
er
on
/of
f
s
c
he
du
l
i
ng
f
or thes
e d
ev
i
c
e
s
.
2.
Rel
ated
W
o
r
k
s a
n
d
M
eth
o
d
o
log
ies
Use
d
IoT
ba
s
ed
S
m
art
S
w
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tc
h
bo
ard
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s
de
s
c
r
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be
d
ba
s
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on
L
a
y
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A
r
c
hi
t
ec
tur
e.
T
he
s
hre
w
d
S
w
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tc
h
bo
ard
f
r
a
m
ew
ork
i
s
s
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arat
ed
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nto
thre
e
l
a
y
e
r
s
:
ap
pl
i
c
at
i
on
l
a
y
er,
orga
ni
z
e
l
a
y
er,
a
nd
Evaluation Warning : The document was created with Spire.PDF for Python.
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CS
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Mu
l
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eth
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m
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orpor
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ert
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CP
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s
tac
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d
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m
erous
Int
ern
et
c
o
nv
e
nti
on
s
f
or
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m
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e
w
eb
ge
t
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o.
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c
o
ns
um
es
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er
y
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w
po
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r
a
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ac
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to
T
I, i
t c
a
n run f
or m
ore tha
n a
y
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ar f
r
o
m
a
s
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ng
l
e c
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n
-
c
el
l
ba
tte
r
y
.
T
he
r
e
are
three
m
aj
or
pa
r
ts
to
thi
s
ap
p
l
i
c
ati
on
.
T
he
y
are
the
d
ev
i
c
e,
c
l
o
ud
s
erv
er
an
d
the
m
ob
i
l
e
ap
p.
E
ac
h
of
the
s
e
f
ea
tures
an
d
the
t
ec
hn
ol
o
gi
es
us
e
d
i
n
th
i
s
proj
ec
t
are
ex
pl
a
i
ne
d
be
l
o
w
[
2].
B
l
y
nk
i
s
a
s
m
artpho
n
e
a
pp
l
i
c
at
i
on
th
at
a
l
l
o
w
s
t
he
de
v
el
op
er
to
c
r
ea
te
a
c
us
tom
ap
p
ac
c
ordi
ng
to
th
e
ap
p
l
i
c
at
i
o
n
s
ho
w
n
F
i
gu
r
e
1
(
b).
It
l
e
v
er
ag
es
t
he
r
es
ou
r
c
es
of
a
s
m
artpho
ne
s
uc
h
as
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tou
c
h
s
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r
ee
n
to
pro
v
i
de
a
s
et
of
wi
d
ge
ts
t
ha
t
as
s
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s
ts
to
c
r
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te
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c
us
tom
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nt
erf
ac
e
to
c
on
tr
ol
the
de
v
i
c
e
r
em
ote
l
y
[
9].
I
t
c
on
s
i
s
ts
of
t
w
o
m
ai
n
el
em
en
ts
,
an
ap
p
l
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c
a
ti
on
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nn
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nd
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a
l
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br
ar
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om
pa
ti
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t
h t
h
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W
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r
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ng
f
r
a
m
e
wor
k
w
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th
ou
r
pr
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oa
r
d
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F
i
g
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1
(
a)
.
TI
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CC320
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La
un
c
h p
ad
F
i
g
ure
1
(
b)
.
B
l
y
nk
A
pp
T
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v
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e
us
es
a
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ed
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o f
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n
s
tan
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us
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w
er c
o
ns
um
pti
o
n [
4
]. T
hi
s
v
a
l
u
e i
s
t
he
s
um
to
tal
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al
l
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en
erg
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o
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y
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l
l
the
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c
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en
tl
y
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wer
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f
r
o
m
i
t.
T
hi
s
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ta
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an
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m
on
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tored
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ti
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e
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o
m
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ob
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p
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o
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er
S
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e
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s
et
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on
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ti
m
i
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s
f
or eac
h d
ev
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c
e.
It c
an
be
us
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t
o s
i
m
ul
a
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pres
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pe
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p
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en
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th
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m
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l
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ds
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as
ed
o
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th
e
v
i
s
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tor
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c
an
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e
du
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l
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F
i
g
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)
ac
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ha
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the
da
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de
v
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s
m
artpho
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ap
p
[
8].
O
nc
e
th
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pr
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t
ap
p
l
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c
at
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on
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s
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tok
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m
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be
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nc
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ud
ed
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the
m
ai
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proj
ec
t
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od
e.
It
a
l
s
o
en
a
bl
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the
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i
c
e
to
c
om
m
un
i
c
ate
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t
ween
e
ac
h
oth
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d
a
l
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be
t
w
e
en
ot
he
r
web
a
pp
l
i
c
at
i
o
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ov
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n
ter
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3].
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
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4
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4
704
F
i
g
ure
1
(
c
)
.
B
l
y
nk
-
Cl
ou
d P
l
atf
or
m
B
ef
ore
as
s
oc
i
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t
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g
a
dg
et
t
o
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ge
t
to
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c
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s
p
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nt
,
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t
n
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ds
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j
o
i
n
t
he
s
y
s
t
em
s
af
el
y
.
T
he
proc
es
s
of
c
on
ne
c
ti
n
g
a
ne
w
W
i
-
F
i
de
v
i
c
e
(
s
tat
i
on
)
to
a
W
i
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F
i
ne
twork
i
s
c
al
l
ed
as
Wi
-
F
i
prov
i
s
i
on
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n
g.
T
he
prov
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s
i
on
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ng
proc
es
s
i
n
v
o
l
v
es
l
oa
d
i
ng
th
e
s
tat
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o
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t
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th
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ne
t
w
ork
na
m
e
r
ef
err
ed
to
as
S
S
ID
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d
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ts
s
ec
urit
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c
r
e
de
nt
i
a
l
s
.
T
he
us
er
ne
ed
s
to
s
e
nd
t
he
pred
ef
i
ne
d
pa
s
s
wor
d.
A
l
t
ho
u
gh
the
r
e
are
ot
he
r
m
eth
od
s
s
uc
h
as
A
c
c
es
s
po
i
nt
m
eth
od
an
d
W
P
S
m
eth
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,
he
r
e
w
e
are
g
oi
n
g
to
us
e
S
m
artConf
i
g
m
eth
od
f
or
W
i
-
F
i
prov
i
s
i
o
ni
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o
ur
de
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be
c
au
s
e
of
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ts
ea
s
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of
us
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S
m
artConf
i
g
i
s
a
T
I
propr
i
eta
r
y
pro
v
i
s
i
on
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eth
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de
s
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gn
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d
f
or
he
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l
es
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S
i
m
pl
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nk
de
v
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c
es
s
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h
as
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m
art
S
wi
tc
hb
o
ard
d
e
v
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c
e.
It
ut
i
l
i
z
es
a
p
ortab
l
e
ap
p
l
i
c
at
i
on
to
c
o
m
m
un
i
c
ate
the
s
y
s
t
em
a
c
c
r
ed
i
tat
i
on
s
f
r
o
m
a
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l
l
ph
on
e,
or
a
t
ab
l
et
to
an
un
pro
v
i
s
i
on
e
d
W
i
-
F
i
ga
dg
et
[5]
.
A
f
ter
the
s
y
s
t
e
m
c
erti
f
i
c
ati
on
s
are
go
t
ten
b
y
th
e
S
i
m
pl
eL
i
nk
ga
dg
et
,
i
t
as
s
oc
i
at
es
na
tura
l
l
y
t
o t
h
e s
y
s
tem
. Us
er c
an
do
wn
l
oa
d t
h
e a
n
droi
d m
ob
i
l
e
ap
p f
r
om
G
oo
gl
e
P
l
a
y
.
3.
Co
n
clus
ion
IoT
ha
s
nu
m
er
ou
s
ap
pl
i
c
ati
o
ns
i
n
v
ario
us
terr
i
tori
e
s
.
It
ha
s
be
en
m
ad
e
f
or
S
m
art
S
w
i
tc
h
bo
ard
S
y
s
t
em
.
T
hi
s
pa
pe
r
i
nv
es
ti
g
ate
d
S
m
art
S
w
i
tc
h
bo
ard
throu
gh
s
orti
n
g
ou
t
IoT
w
i
t
h
W
e
b
s
erv
er
an
d
C
l
ou
d
P
l
at
f
or
m
.
O
ur
ap
proac
h
i
nc
l
ud
e
d
i
ntrod
uc
i
ng
l
ea
r
n
i
ng
i
nto
s
en
s
ors
us
i
ng
E
ne
r
g
i
a
organ
i
z
e,
em
po
w
e
r
i
ng
i
nte
r
c
ha
ng
es
wi
th
s
a
v
v
y
t
hi
ng
s
us
i
n
g
Cl
ou
d
org
an
i
z
at
i
o
ns
f
or
ba
s
i
c
ac
c
es
s
i
n
di
f
f
erent
r
an
ge
s
,
an
d
up
grad
i
n
g
da
t
a
ex
c
ha
n
ge
v
i
ab
i
l
i
t
y
.
T
he
ap
pro
ac
h
w
as
r
ea
s
on
a
bl
y
u
ti
l
i
z
e
d
f
or
s
ho
wi
ng
as
s
oc
i
a
ti
o
ns
f
or
m
ea
s
urin
g
ho
m
e
c
on
d
i
t
i
on
s
,
c
he
c
k
i
ng
e
l
ec
tr
i
c
a
l
m
a
c
hi
ne
s
,
a
nd
c
on
tr
ol
l
i
ng
ho
m
e
r
ob
oti
z
at
i
on
.
T
he
f
ou
nd
at
i
on
c
an
b
e
r
ec
ei
v
e
d
f
or
or
ad
j
us
ted
to
di
f
f
erent a
pp
l
i
c
a
ti
o
ns
.
Ref
er
en
ce
s
[1]
Cha
ri
th
P
e
re
ra
a
n
d
Ch
i
Haro
l
d
L
i
u
.
”T
h
e
Em
e
r
g
i
n
g
In
te
r
n
e
t
o
f
T
h
i
n
g
s
M
a
rk
e
tPl
a
c
e
fro
m
a
n
I
n
d
u
s
tri
a
l
Pe
rs
p
e
c
ti
v
e
:
A
Su
rv
e
y
”
.
IEEE
Tra
n
s
a
c
t
i
o
n
o
n
Em
e
rg
i
n
g
T
o
p
i
c
s
o
n
Co
m
p
u
t
i
n
g
.
2
0
1
5
.
[2]
Al
a
Al
-
Fu
q
a
h
a
a
n
d
M
o
h
s
e
n
G
u
i
z
a
n
i
.
“In
te
rn
e
t
o
f
T
h
i
n
g
s
:
A
Su
rv
e
y
o
n
En
a
b
l
i
n
g
T
e
c
h
n
o
l
o
g
i
e
s
,
Pro
to
c
o
l
s
a
n
d
Ap
p
l
i
c
a
ti
o
n
s
”
.
IE
EE Co
m
m
u
n
i
c
a
ti
o
n
Su
r
v
e
y
s
a
n
d
T
u
t
o
ri
a
l
s
.
2
0
1
5
.
[3]
M
o
a
ta
z
So
l
i
m
a
n
a
n
d
T
o
b
i
Ab
i
o
d
u
n
.
“
Sm
a
rt
Hom
e
:
In
te
g
r
a
te
d
In
te
rn
e
t
o
f
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