Iot sdk thesis

Method 
Description 
getSaraR4Baudrate() 
Returns the correct baudrate for the serial 
port that connects to SARA R4XX 
device
setDiag (Stream& stream)
 
Sets the optional "Diagnostics and 
Debug" stream. 
init(Stream& stream, int8_t onoffPin,
Stream& 
stream, int8_t onoffPin, int8_t txEnablePin, 
int8_t saraR4XXTogglePin, uint8_t cid)
 
Initializes the modem instance. Sets the 
modem stream and the on-off power 
pins. 
createSocket(uint16_t localPort = 0) 
Create a UDP socket for the specified 
local port, returns the socket handle. 
connect(const char* apn, const char* cdp, const 
char* forceOperator = 0, uint8_t band = 8) 
Turns on and initializes the modem, then 
connects to the network and activates the 
data connection. Returns true when 
successful. 
socketSend(uint8_t socket, const char* 
remoteIP, const uint16_t remotePort, const 
uint8_t* buffer, size_t size)
 
Send a UDP payload buffer to a 
specified remote IP and port, through a 
specific socket. 
Table 3.1.2.1.1 SODAQ NB-IoT API 
[31]
 

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42 
The code snippet below shows different methods used from API to implement the UPD 
messaging over NB-IoT 
//Define the operator-specific settings
const
char
* apn = 
"u.iot.mt.gr.hu"
; 
//The operator
’
s pre-commercial NB-IOT APN
const
char
* cdp = 
NULL
;
const
uint8_t cid = 
1
; 
const
uint8_t band = 
20
; 
//LTE band 20 (Uplink: 832 MHz 
–
862MHz; Downlink: 
791 
–
821) 
const
char
* forceOperator = 
"21630"
; 
Sodaq_nbIOT nbiot; 
//Create an object to access the API methods
void
setup()
{ 
/*Connect to the NB-IoT Network*/
DEBUG_STREAM.print(
"Initializing and connecting... "
);
while
(!nbiot.connect(apn, cdp, forceOperator, band)); 
DEBUG_STREAM.println(
"Connected succesfully!"
);
/*Open a UDP Socket*/
while
(!openSocketUDP());
/*Send a string to a remote IP and port*/
nbiot.socketSend(socketID, 
"165.227.145.200"
, 
41243
, 
"SODAQ UDP Packet"
);
} 
/*A custom-made function to open a UDP socket*/
int
openSocketUDP()
{ 
/*A open a socket at local port 0*/
socketID = nbiot.createSocket(0); 
/*NB-IoT module assigns a socket ID, valid values are 0 to 6*/
if
(socketID >= 
7
|| socketID < 
0
)
{
DEBUG_STREAM.println(
"Failed to create socket"
);
return
0
;
} 
else
{ 
DEBUG_STREAM.println(
"Created socket at"
);
DEBUG_STREAM.println(socketID); 
return
1
;
} 
} 

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43 
Results 
The state of debug serial terminal during the run-time and the received message 
“SODAQ 
UDP PACKET”
at remote IP is shown below.