Using CMUX over UART on WP7607-1

Hello!

I’ve been trying to run CMUX on UART1 of the modem, using AT commands from external uC. I’m porting solution, that was running fine on HL7692. Modem was starting, then AT+CMUX=0,0,5,512, configure channels (send SABM, receive UA etc. ) and from then start sending commands using CMUX protocol.

But on this modem, I’ve found, that before AT+CMUX there is also AT!MUXMODE=1 needed to enable it and then modem needs to be reset. The problem is, after it resets, it no longer responds to regular AT commands (not encapsuled in GSM 07.10 protocol). Therefore, I can’t use AT+CMUX. And as far as I know, I also can’t open logical channels with SABM before AT+CMUX=0 to start it.

Is there something I’m missing here? Anyone managed to make it work? Thanks for your help!

i can see my module can still respond AT command after AT!MUXMODE=1 and reset.

ati3
Manufacturer: Sierra Wireless, Incorporated
Model: WP7608
Revision: SWI9X07Y_02.18.05.00 000000 jenkins 2018/07/19 17:40:21
IMEI: 352913090100734
IMEI SV: 5
FSN: XG805285330204
+GCAP: +CGSM

OK

at!muxmode=1
OK
at!reset
OK

+CREG: 2

+CGREG: 2

+CREG: 1,“FFFE”,“6745D16”,7

at!mapuart?
!MAPUART: 1,16

OK
at+ipr?
+IPR: 115200

OK
at+ifc?
+IFC: 0,0

OK