SARA-R410M-02B UDP breaks after couple of hundred packets

0 votes
We open UDP socket, and start sending and receiving packets over it (AT+USOST).

After couple of hundred packets (the number varies) it enters a state where it returns

AT! +CME ERROR

On any send request. Inbound traffic also stops at this point.

When modem gets into this state, most of the socket related command return error you cannot close the socket, create the new one or do anything with the IP stack basically.

at+cgpaddr

+CGPADDR: 1,11.240.255.2

OK

at+usocl=0

+CME ERROR: Operation not allowed

at+usocl=1

+CME ERROR: Operation not allowed

at+usocr=17

+CME ERROR: Operation not allowed

So we get Operation not allowed on most of the socket related commands. We have disabled eDRX and tried both hex and binary mode, happens in both.
by tomo asked Oct 17
50 views
0 votes
Maybe network closed the socket and you missed URC or network closed the socket and notification didn't make it to the modem.
by grumpy answered Oct 18
I have a very similar issue I just posted as a comment here:
https://forum.u-blox.com/index.php/21330/sara-r410m-mode-freezes-after-hundred-consequent-packets-sent?show=21330%23q21330

SARA is most definitely buggy with the UDPs.
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