Dear Team,
we’re evaluating the BC92 and already ordered a first batch of boards for it.
It’s an awesome chip but I think it still runs beta firmware. Is there a roadmap for a firmware update?
And one side question: what’s “STNN”? The module sends this from time to time after a command
Also, here’s some feedback:
PSM
On our own board, PSM does not work reliably. The first time after boot, the module goes successfuly into deep sleep, but after waking it with PSM_EINT by pulling it low, it does wake up but never goes back to deep sleep. Sometimes it works 2 or 3 cycles, but never more. I can see some activity with a current profiler showing spikes every 90 seconds and after 3 such spikes the current goes up to 25.5mA with a lot of ripple and after another approx. 3 minutes the module goes into deep sleep successfully.
The behavior is different with BC92 TE-B where it seems to work flawlessly.
Is there anything required in circuity? Like holding PSM_EINT (or any other pin) up to prevent it from floating so that the module can go to deep sleep? Do you maybe have a schematic of the TE-B?
UDP/GSM
It seems UDP is not implemented for GSM.
AT+QNWCFG=0,1
OK
AT+QIOPEN=1,0,“UDP”,“78.94.82.30”,49897
OK
+QIOPEN: 0,570
The same commands work perfectly for NB.
APN is set and it seems UE is attached but the context can’t be activated:
AT+CGATT?
+CGATT: 1
AT+CGACT?
+CGACT: 1,0
AT+CGACT=1,1
ERROR
It takes a while between AT+CGACT and ERROR.
Release assistance
The module always stays active 20 seconds for a successful data transmission and it seems there’s no way (yet) to force a release like we would do with AT+QCFG=“rrcabort” for the BG series.
Power profile for failed PSM
Power profile for successful PSM
