NB IoT

api.nbSend(addr, port, msg, timeout, type)

Overview

Sends buffer msg to NB on specified IP, port and protocol type. Maximum length of Rx and Tx messages is 512 Bytes. Maximum execution time is limited by timeout milliseconds.

Arguments

• addr (string) - IP address
• port (integer) - Port
• msg (string) - String to be sent to NB
• timeout (integer) - The maximum execution time in milliseconds
• type (string) - Protocol type, either UDP or TCP.

Example

-- sends "test message" string to IP 185.8.239.192 on port 5566 with 6s timeout 
status,answer = api.nbSend("185.8.239.192", 5566, "test message", 6000, "UDP") 

api.nbAT(command, timeout, wakeUp)

Overview

Sends an AT command to NB module with specified timeout.

Print of AT command can be turned ON and OFF by using this command:

-- AT_DEBUG_OFF - turn off 
-- AT_DEBUG_ON - turn on
-- REINITIALIZE - re-initialize the NB-IoT module
-- ICCID? - returns ICCID value of current SIM card
-- IMSI? - returns IMSI value of current SIM card
-- IMEI? - returns IMEI value of the modem
api.nbAT("AT_DEBUG_ON")

Arguments

• command (string) - AT command
• timeout (integer) - The maximum execution time in milliseconds
• wakeUp (integer, optional) - Sending 1 will make sure that module is not asleep

Return

• answer (string) - Nil or non-zero length string with an answer to a AT command
• status (integer) - Zero for success, negative for failure

Example #1

-- Get IMSI number of SIM card with timeout of 4 seconds 
res = api.nbAT("AT+CIMI", 4000)
print(res)

Example #2

-- IMEI --
x=api.nbAT("AT+CGSN")
start = string.find(x, "\n")
finish = string.find(x, "\r", start+1)
imei = string.sub(x,(start+1),(finish-1))
print("IMEI: " .. imei)

Example #3

-- Get signal strength
res,b = api.nbAT("AT+CSQ")
print(res)