TELIT ME310G1 erroneous +CMUX command

[rickou]

Describe the bug ME310 get stuck on init after a failure at the AT+CMUX command step.

To Reproduce Use a Telit ME310G1-WW modem with fw AT#SWPKGV 37.00.217-P0C.210001 M0C.200006 P0C.210001 A0C.210000

Expected behavior no error and continue initialisation in muxed mode

Logs and console output

[00:01:01.128,000] <dbg> modem_chat: modem_chat_script_next: sending: AT+CGMR
[00:01:01.161,000] <dbg> modem_chat: modem_chat_log_received_command:  M0C.200006
[00:01:01.161,000] <dbg> modem_chat: modem_chat_script_next: telit_mex10g1_init_chat_script: step: 26
[00:01:01.161,000] <dbg> modem_chat: modem_chat_log_received_command: OK
[00:01:01.161,000] <dbg> modem_chat: modem_chat_script_next: telit_mex10g1_init_chat_script: step: 27
[00:01:01.161,000] <dbg> modem_chat: modem_chat_script_next: sending: AT+CFUN=1
[00:01:01.838,000] <dbg> modem_chat: modem_chat_log_received_command: OK
[00:01:01.838,000] <dbg> modem_chat: modem_chat_script_next: telit_mex10g1_init_chat_script: step: 28
[00:01:01.838,000] <dbg> modem_chat: modem_chat_script_next: sending: AT+CMUX=0,0,5,127,10,3,30,10,2
[00:01:01.865,000] <dbg> modem_chat: modem_chat_on_unknown_command_received: +CME ERROR: 4
[00:01:02.138,000] <dbg> modem_chat: modem_chat_script_stop: telit_mex10g1_init_chat_script: complete
[00:01:02.138,000] <dbg> modem_cellular: modem_cellular_log_event: event script success
[00:01:02.138,000] <dbg> modem_cellular: modem_cellular_log_event: event bus closed
[00:01:02.138,000] <dbg> modem_cellular: modem_cellular_log_state_changed: switch from run init script to connect cmux
[00:01:02.238,000] <dbg> modem_cellular: modem_cellular_log_event: event timeout
[00:01:02.238,000] <dbg> modem_cellular: modem_cellular_log_event: event bus opened

Additional context refer to #78890

The Telit document 80617ST10991A Rev. 15 specify only AT+CMUX=\<mode>[,\<subset>[,\<port_speed>[,\<N1>]]]

Solution is to shorten the command to 4 parameters. (i don't know how to push the fix ??)

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[jeffwelder-ellenbytech]

My experience on the ME910G1-WW was the CMUX command takes a different amount of parameters based on firmware version of the modem.

Afaik it's undocumented by Telit. If a change is made in this area it might be wise to check the solution on multiple firmwares.

[rickou]

You're right, but i received an answer from Telit this week:

In the ME310G1 family, the +CMUX command doesn't support the extra fields "T1","N2","T2" and "T3":

Checking the r13, the release used by Erlkoenig90 in #78890, the extra parameters are the default ones. So, no prolems to simply remove the extra parameters.

In all cases, we need to do something or new modem FW do not works anymore.