I am working with two different QMI modems (Telit LE910 and Sierra MC7710 in QMI mode) and experimenting one issue with both of them.
After boot I try to establish the connection: ModemManager & (wait for the modem to be detected) mmcli -m 0 --simple-connect="apn=.." This somtimes works, but most of the time fails. However, when it fails, issuing mmcli -m 0 --simple-connect="apn=.." always works. I don't think it is related to the enviroment, because other modems (or even the same Sierra MC7710 using MBIM or Direct IP) work fine. The common error is this (complete logs at the end) ModemManager[684]: [/dev/cdc-wdm0] No transaction matched in received message What could be causing that? Sierra log (QMI) root@ccimx6sbc:~# ModemManager[684]: <info> Simple connect started... ModemManager[684]: <info> Simple connect state (1/8): Unlock check ModemManager[684]: <info> Simple connect state (2/8): Wait to get fully initialized ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (locked -> initializing) ModemManager[684]: <warn> (ttyUSB2): port attributes not fully set ModemManager[684]: <warn> couldn't load list of Own Numbers: 'Couldn't get MSISDN: QMI protocol error (16): 'NotProvisioned'' ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (initializing -> disabled) ModemManager[684]: <info> Simple connect state (3/8): Enable ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disabled -> enabling) ModemManager[684]: <warn> (ttyUSB2): port attributes not fully set ModemManager[684]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[684]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> enabled) ModemManager[684]: <info> Simple connect state (4/8): Wait to get fully enabled ModemManager[684]: <info> Simple connect state (5/8): Register ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> searching) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabled -> searching) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (searching -> idle) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (idle -> registering) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (searching -> registered) ModemManager[684]: <info> Simple connect state (6/8): Bearer ModemManager[684]: <info> Simple connect state (7/8): Connect ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting) ModemManager[684]: [/dev/cdc-wdm0] Allocating new client ID... ModemManager[684]: [/dev/cdc-wdm0] Registered 'wds' (version 1.12) client with ID '1' ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (home -> idle) ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> disconnecting) ModemManager[684]: [/dev/cdc-wdm0] No transaction matched in received message ModemManager[684]: <warn> Error disconnecting bearer '/org/freedesktop/ModemManager1/Bearer/0': 'Couldn't disconnect QMI bearer: this bearer is not connected'. Will assume disconnected anyway. ModemManager[684]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disconnecting -> enabled) error: couldn't connect the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Cancelled: Connection setup operation has been cancelled' Telit LE910 (QMI) log: root@imx6qsabresd:~# mmcli -m 0 --simple-connect=apn=ac.vodafone.es,pin=1234 ModemManager[960]: <info> Simple connect started... ModemManager[960]: <info> Simple connect state (1/8): Unlock check ModemManager[960]: <info> Simple connect state (2/8): Wait to get fully initialized ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (locked -> initializing) ModemManager[960]: <warn> (ttyUSB2): port attributes not fully set ModemManager[960]: <warn> couldn't load list of Own Numbers: 'Couldn't get MSISDN: QMI protocol error (16): 'NotProvisioned'' ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (initializing -> disabled) ModemManager[960]: <info> Simple connect state (3/8): Enable ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disabled -> enabling) ModemManager[960]: <warn> (ttyUSB2): port attributes not fully set ModemManager[960]: <warn> (ttyUSB3): port attributes not fully set ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> searching) ModemManager[960]: Couldn't read SMS messages: QMI protocol error (17): 'MissingArgument' ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (searching -> unknown) ModemManager[960]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (17): 'MissingArgument' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (52): 'DeviceNotReady' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[960]: Couldn't read SMS messages: QMI protocol error (48): 'InvalidArgument' ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> enabled) ModemManager[960]: <info> Simple connect state (4/8): Wait to get fully enabled ModemManager[960]: <info> Simple connect state (5/8): Register ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown -> idle) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (idle -> registering) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabled -> registered) ModemManager[960]: <info> Simple connect state (6/8): Bearer ModemManager[960]: <info> Simple connect state (7/8): Connect ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting) ModemManager[960]: [/dev/cdc-wdm0] Allocating new client ID... ModemManager[960]: [/dev/cdc-wdm0] Registered 'wds' (version 1.36) client with ID '10' ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (home -> searching) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (searching -> idle) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> disconnecting) ModemManager[960]: <warn> Error disconnecting bearer '/org/freedesktop/ModemManager1/Bearer/0': 'Couldn't disconnect QMI bearer: this bearer is not connected'. Will assume disconnected anyway. ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disconnecting -> enabled) error: couldn't connect the modem: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Cancelled: Connection setup operation has been cancelled' ModemManager[960]: [/dev/cdc-wdm0] No transaction matched in received message ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (idle -> registering) (ModemManager:960): GLib-CRITICAL **: g_variant_new_string: assertion 'g_utf8_validate (string, -1, NULL)' failed (ModemManager:960): GLib-CRITICAL **: g_variant_ref_sink: assertion 'value != NULL' failed ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering -> home) ModemManager[960]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabled -> registered)
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