Do PSM drop TCP/IP session(MQTT) when going sleep?

Question

Any idea if PSM should drop the PDP context and the TCP/IP session information when going sleep?

My understanding is PSM should retain all these info, so when wake up, it can seamless connect back to tcp/ip session before it sleep. however, in testing, my iot modem(Qualcomm 9205/Quectel Bg95) seems dropping the PDP, MQTT connection info before it enter sleep, so when wake up, I have to re-establish everything. that seems wrong.

Anyone with experience in this?

PiMaker0 · Answer

Your TCP connection will probably expire but your registration and PDP context should stay alive. Check this out for reference. PDP is only the tunnel to enable data connections so TCP will still time out (which affects MQTT).

Answered by PiMaker0 on August 23, 2021

Do PSM drop TCP/IP session(MQTT) when going sleep?

One Answer

Add your own answers!

Ask a Question