Problem when disable GPRS context and try to re-enable it

Hello,

I start a new thread about a bad thing I seen. I can't re-enable a previously disabled context.

Here the command to reproduce the issue:

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dbus-send --system --type=method_call --print-reply --dest=org.ofono /simcom_0/context1 org.ofono.ConnectionContext.SetProperty string:"Activ e" variant:boolean:true

dbus-send --system --type=method_call --print-reply --dest=org.ofono /simcom_0/context1 org.ofono.ConnectionContext.SetProperty string:"Activ e" variant:boolean:false

dbus-send --system --type=method_call --print-reply --dest=org.ofono /simcom_0/context1 org.ofono.ConnectionContext.SetProperty string:"Activ e" variant:boolean:true
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and bellow, the log:

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ofonod[10347]: Modem: > AT+CGDCONT=1,"IP","gprs.swisscom.ch"\r ofonod[10347]: Modem: < \r\nOK\r\n
ofonod[10347]: drivers/atmodem/gprs-context.c:at_cgdcont_cb() ok 1 ofonod[10347]: Modem: > AT+CGDATA="PPP",1\r
ofonod[10347]: Modem: < \r\nCONNECT 115200\r\n ofonod[10347]: drivers/atmodem/gprs-context.c:at_cgdata_cb() ok 1 ofonod[10347]: drivers/atmodem/gprs-context.c:setup_ppp() ofonod[10347]: drivers/atmodem/gprs-context.c:ppp_connect() ofonod[10347]: IP: 10.146.60.102
ofonod[10347]: DNS: 195.186.216.33, 195.186.152.33 ofonod[10347]: src/gprs.c:pri_activate_callback() 0x108698 ofonod[10347]: plugins/udev.c:udev_event() subsystem net add ofonod[10347]: plugins/udev.c:udev_event() subsystem net finished ofonod[10347]: plugins/udevng.c:check_modem_list() ofonod[10347]:
drivers/atmodem/gprs-context.c:at_gprs_deactivate_primary() cid 1 ofonod[10347]: plugins/udevng.c:remove_device() /sys/devices/virtual/net/ppp0
ofonod[10347]: plugins/udev.c:udev_event() subsystem net remove ofonod[10347]: plugins/udev.c:remove_modem() /devices/virtual/net/ppp0 ofonod[10347]: plugins/udev.c:udev_event() subsystem net finished ofonod[10347]: drivers/atmodem/gprs-context.c:ppp_disconnect() Reason: 6 ofonod[10347]: Modem: < \r\nNO CARRIER\r\n

ofonod[10347]: drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1
ofonod[10347]: src/gprs.c:pri_activate_callback() 0x108698 ofonod[10347]: src/gprs.c:pri_activate_callback() Activating context failed with error: Unknown error type
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I read the code, added some logs and found the function at_chat_send_common() doesn't do his job because chat->command_queue is NULL.

I guess chat->command_queue is free and set to NULL in chat_cleanup(struct at_chat *chat) but I don't dig more why this function is call...

Any ideas ?

Regards,
Anthony Viallard.

Quoted 11 lines · Viallard Anthony

ofonod[10347]: drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1
ofonod[10347]: src/gprs.c:pri_activate_callback() 0x108698 ofonod[10347]: src/gprs.c:pri_activate_callback() Activating context failed with error: Unknown error type
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I read the code, added some logs and found the function at_chat_send_common() doesn't do his job because chat->command_queue is NULL.

Quoted 5 lines

I guess chat->command_queue is free and set to NULL in chat_cleanup(struct at_chat *chat) but I don't dig more why this function is call...

Any ideas ?

I think I've seen this before, or something similar. It may be that when the modem hangs up the PPP link it also hangs up the serial port (e.g. using a HUP). GAtChat thinks that the port has been closed and things no longer work.

On most devices this behavior can be turned off by sending AT&C0 init string. Try that?