Couldn't refresh signal quality: 'Serial command timed out'

[Jan Graczyk]

Hello All,

I have a problem with getting the proper signal level from ModemManager. Here is the Linux console output from ModemManager -debug session:

ModemManager[1580]: <debug> [1490979773.483400] [mm-broadband-modem.c:1991] modem_load_signal_quality(): loading signal quality...
ModemManager[1580]: <debug> [1490979773.483759] [mm-port-serial.c:1237] mm_port_serial_open(): (ttymxc2) device open count is 2 (open)
ModemManager[1580]: <debug> [1490979773.484146] [mm-port-serial-at.c:440] debug_log(): (ttymxc2): --> 'AT+CIND?<CR>'
ModemManager[1580]: <debug> [1490979776.462143] [mm-port-serial.c:1237] mm_port_serial_open(): (ttymxc2) device open count is 3 (open)
ModemManager[1580]: <debug> [1490979776.462543] [mm-port-serial.c:1296] mm_port_serial_close(): (ttymxc2) device open count is 2 (close)
ModemManager[1580]: <debug> [1490979776.462821] [mm-port-serial-at.c:440] debug_log(): (ttymxc2): --> 'AT+CSQ<CR>'
ModemManager[1580]: <debug> [1490979779.462935] [mm-port-serial.c:1296] mm_port_serial_close(): (ttymxc2) device open count is 1 (close)
ModemManager[1580]: <debug> [1490979779.463338] [mm-iface-modem.c:1221] signal_quality_check_ready(): Couldn't refresh signal quality: 'Serial command timed out'

This happen when I have issued the following command to ModemManager:

mmcli -m 0 --simple-disconnect

The command:
mmcli -m 0 --simple-connect="pin=1234,apn=internet"
does not bring the ModemManager back to receive proper signal quality.
What I need to do to get ModemManager properly detecting signal quality?

In order to get ModemManager updating signal quality I needed to power down and power up the development board.

Best Regards,

Jan Graczyk






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