Hi, I have a custom OS built in the buildroot framework and try to integrate Modem Manager to handle Quectel EG21[the same VID:PID as EC21] using QMI. I've followed Quectel instruction with patching option.c and qmi_wwan in the kernel, libqmi seems to work as expected. Unfortunately, when creating connection over mmcli it always uses ttyUSB2 as primary port, instead of cdc-wdm0 and expecting PPP to be onboard in order to obtain IP address.
I've spent a few days trying to figure out the root cause, here are my findings: 1. I can connect to network using qmicli, get IP address using udhcpc and ping DNS address *# qmicli --device=/dev/cdc-wdm0 --device-open-proxy --wds-start-network="ip-type=4,apn=datamobile.ag <http://datamobile.ag>" --client-no-release-cid --device-open-qmi[01 Jan 1970, 04:00:08] -Warning ** [/dev/cdc-wdm0] couldn't detect transport type of port: unexpected driver detected: qmi_wwan_q[01 Jan 1970, 04:00:08] -Warning ** [/dev/cdc-wdm0] requested QMI mode but unexpected transport type found[/dev/cdc-wdm0] Network started Packet data handle: '2263396000'[/dev/cdc-wdm0] Client ID not released: Service: 'wds' CID: '5'# udhcpc -q -f -i wwan0udhcpc: started, v1.32.0udhcpc: sending discoverudhcpc: sending select for 100.76.170.231udhcpc: lease of 100.76.170.231 obtained, lease time 7200deleting routersadding dns 8.8.8.8* *adding dns 8.8.4.4* 2. When using mmcli simple connect command, I can connect to network but get stuck on IP request - that's because I don't use PPP, here is the relevant debug log: *Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.002863] [modem0/bearer0] looking for best CID matching APN 'datamobile.ag <http://datamobile.ag>' and PDP type 'ipv4'...Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.003039] [modem0/bearer0] found exact context at CID 4Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.003261] [modem0/ttyUSB2/at] device open count is 3 (open)Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.003403] [modem0/bearer0] connection through a plain serial AT port: ttyUSB2Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.003608] [modem0/ttyUSB2/at] device open count is 4 (open)Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.003919] [modem0/ttyUSB2/at] device open count is 3 (close)Jan 1 04:43:56 zubrOS ModemManager[342]: <debug> [000017037.004334] [modem0/ttyUSB2/at] --> 'ATD*99***4#<CR>'Jan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.059613] [modem0/ttyUSB2/at] <-- '<CR><LF>CONNECT 150000000<CR><LF>'Jan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.065783] [modem0/bearer0] setting flow control in ttyUSB2: rts-ctsJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.068708] [modem0/ttyUSB2/at] enabling RTS/CTS flow controlJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.069096] [modem0/ttyUSB2/at] port attributes not fully setJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.069307] [modem0/ttyUSB2/at] flow control settings updated to rts-ctsJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.069642] [modem0/ttyUSB2/at] port now connectedJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.070119] [modem0/bearer0] connectedJan 1 04:43:57 zubrOS ModemManager[342]: <debug> [000017037.071269] [modem0/bearer0] PPP is required for connection, will ignore disconnection reportsJan 1 04:43:57 zubrOS ModemManager[342]: <info> [000017037.071682] [modem0] state changed (connecting -> connected)Jan 1 04:43:57 zubrOS ModemManager[342]: <info> [000017037.092887] [modem0] simple connect state (8/8): all done* 3. I've checked lastest version 1.14.8 as well as 1.12.6, results are the same. 4. I've looked into the debug logs, looks like the problem is that for some reason Modem Manager tries to use cdc-wdm0 port as a AT command port - AT command check fails so it ignores cdc-wdm0 and fallbacks to ttyUSB2: *Jan 1 04:51:00 zubrOS ModemManager[342]: <debug> [000017460.859237] [filter] cdc-wdm devices allowed: yesJan 1 04:51:35 zubrOS kernel: [ 54.178239] qmi_wwan_q 1-1:1.4: cdc-wdm0: USB WDM deviceJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.405464] [base-manager] adding port cdc-wdm0 at sysfs path: /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1:1.4/usbmisc/cdc-wdm0Jan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.420915] [cdc-wdm0] could not get vendor/product idJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.438657] [filter] (usbmisc/cdc-wdm0) port allowed: cdc-wdm deviceJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.447846] [base-manager] port cdc-wdm0 is first in device /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1Jan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.452686] [cdc-wdm0] could not get vendor/product idJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.452926] [cdc-wdm0] could not get vendor/product idJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.453594] [plugin-manager] task 5: port grabbed: cdc-wdm0Jan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.453830] [plugin-manager] task 5,cdc-wdm0: new support task for portJan 1 04:51:35 zubrOS ModemManager[342]: <debug> [000017495.453969] [plugin-manager] task 5,cdc-wdm0: deferred until min wait time elapsedJan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097261] [plugin-manager] task 5,cdc-wdm0: found '2' plugins to tryJan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097370] [plugin-manager] task 5,cdc-wdm0: will try with plugin 'quectel'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097474] [plugin-manager] task 5,cdc-wdm0: will try with plugin 'generic'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097620] [plugin-manager] task 5,cdc-wdm0: startedJan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097735] [plugin-manager] task 5,cdc-wdm0: checking with plugin 'quectel'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.097997] [plugin/quectel] probes required for port cdc-wdm0: 'at'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.105918] [cdc-wdm0/probe] launching port probing: 'at'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.180827] [cdc-wdm0/at] opening serial port...Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.182859] [cdc-wdm0/at] device open count is 1 (open)Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.184505] [cdc-wdm0/at] --> 'AT<CR><LF>'Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.316902] [plugin-manager] task 5: still 6 running probes (5 active): ttyUSB3, ttyUSB0, ttyUSB1, ttyUSB2, wwan0, cdc-wdm0Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.472725] [plugin-manager] task 5,cdc-wdm0: got suggested plugin (quectel)Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.472903] [plugin-manager] task 5: still 5 running probes (5 active): ttyUSB0, ttyUSB1, ttyUSB2, wwan0, cdc-wdm0Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.529726] [plugin-manager] task 5: still 4 running probes (4 active): ttyUSB0, ttyUSB1, ttyUSB2, cdc-wdm0Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.748822] [plugin-manager] task 5: still 3 running probes (3 active): ttyUSB0, ttyUSB1, cdc-wdm0Jan 1 04:51:37 zubrOS ModemManager[342]: <debug> [000017497.967929] [plugin-manager] task 5: still 3 running probes (3 active): ttyUSB0, ttyUSB1, cdc-wdm0Jan 1 04:51:39 zubrOS ModemManager[342]: <debug> [000017499.975497] [cdc-wdm0/at] --> 'AT<CR><LF>'Jan 1 04:51:42 zubrOS ModemManager[342]: <debug> [000017502.972692] [cdc-wdm0/at] --> 'AT<CR><LF>'Jan 1 04:51:44 zubrOS ModemManager[342]: <debug> [000017504.098907] [plugin-manager] task 5: still 2 running probes (2 active): ttyUSB0, cdc-wdm0Jan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.974499] [cdc-wdm0/probe] port is not AT-capableJan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.975249] [plugin-manager] task 5,cdc-wdm0: found best plugin for port (quectel)Jan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.975721] [plugin-manager] task 5,cdc-wdm0: finished in '10.521877' secondsJan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.976232] [plugin-manager] task 5,cdc-wdm0: best plugin matches device reported one: quectelJan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.977365] [cdc-wdm0/at] device open count is 0 (close)Jan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.977820] [cdc-wdm0/at] closing serial port...Jan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.990382] [cdc-wdm0/at] serial port closedJan 1 04:51:45 zubrOS ModemManager[342]: <debug> [000017505.993552] [cdc-wdm0/at] forced to close portJan 1 04:51:47 zubrOS ModemManager[342]: <warn> [000017507.074976] [plugin/quectel] could not grab port cdc-wdm0: Cannot add port 'usbmisc/cdc-wdm0', unsupported* That's the point where I stucked and ran out of ideas for further debugging. I expect there might be some udev rule missing for EG21 to make it work, something that would suggest Modem Manager to use cdc-wdm0 as QMI interface instead of AT. Any ideas what is the problem I am facing here? I will appreciate any help. Best Regards, Rafał
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