The default IP for the backend server is 172.16.15.14 and the port should be set to 1234.
You can use any port you like for the local port (the
This will send “Hello world” (“48656C6C6F20576F726C6421”) to the backend server:
AT+NSOCR="DGRAM",17,8888,1 AT+NSOST=0,"172.16.15.14",1234,12,"48656C6C6F20576F726C6421" AT+NSOCL=0
First release was in release 13 of 3GPP standards. It’s also called Cat-M2, but most widely referred to as NB-IoT. It’s not using LTE radio, like 4G and LTE Cat M1, but is rather based on direct-sequence spread spectrum (DSSS) modulation.
The duplex mode is half duplex, and the bandwidth is 250 Kbps downlink and 20 Kbps (single-tone) / 250 Kbps (multi-tone) uplink. The latency is between 1.6s and 10s.
First relase was in release 13 of 3GPP standards, much like NB-IoT. It seems like the term LTE-M is getting more adoption in the industry, but the official names are LTE Cat M1 and eMTC. Some also refer to the as Cat-M1.
The duplex mode is full duplex, and the bandwidth is 1Mbps downlink and 1Mbps uplink. The latency is between 10ms and 15ms.