R410M bug: zero payload UDP packet lockup


Once the device receives a UDP packet which does not have payload (which are commonly used as keepalive) the socket locks up: it can no longer receive new packets.

Firmware revision: L0. [Feb 03 2018 13:00:41]

Hi @akos,

I tried sending an empty UDP package using: AT+USOST=0,“IP”,PORT, 0, “”, but it didn’t really like the empty data. I got a generic CME ERROR: OPERATION NOT ALLOWED. How have you managed to send an empty UDP packet?


I think he means sending a message to the device, not sending from it.
Sending an empty string, from the device, is not possible.

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Thanks, explains. Reading is hard on the early monday morning.