em7455: 115200 is the correct baud rate for this modem:
# socat - /dev/ttyUSB2,b115200,crnl
AT
OK
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.20.03.00 r6691 CARMD-EV-FRMWR2 2016/06/30 10:54:05
MEID: ******
IMEI: ******
IMEI SV: 6
FSN: ******
+GCAP: +CGSM,+DS,+ES
OK
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em7455: Operating system name and version: openSuSE 42.2
Version of smsd: 3.1.21, 3.1.20 - both versions affected.
Smsd installed from: sources (3.1.21) and package repository (3.1.20)
Name and model of a modem / phone: PCI M.2 modem Sierrawireless EM7455. MC7455 could be affected too.
Interface: serial (USB bus emulation)
Smsd could not connect to the modem:
/var/log/smsd> sudo cat smsd.log
2017-07-03 02:20:30,2, smsd: Smsd v3.1.21 started.
2017-07-03 02:20:30,2, smsd: Running as smsd:dialout (479:16).
2017-07-03 02:20:30,7, smsd: Running startup_check (shell): /var/spool/sms/incoming/smsd_script.THs4qH /tmp/smsd_data.ztKYy0
2017-07-03 02:20:30,7, smsd: Done: startup_check (shell), execution time 0 sec., status: 0 (0)
2017-07-03 02:20:30,4, smsd: File mode creation mask: 022 (0644, rw-r--r--).
2017-07-03 02:20:30,5, smsd: Outgoing file checker has started. PID: 12083.
2017-07-03 02:20:30,7, smsd: All PID's: 12083,12084
2017-07-03 02:20:30,5, GSM1: Modem handler 0 has started. PID: 12084.
2017-07-03 02:20:30,5, GSM1: Using check_memory_method 1: CPMS is used.
2017-07-03 02:20:30,3, GSM1: Couldn't open serial port /dev/ttyUSB2, error: Device or resource busy, waiting 30 sec.
2017-07-03 02:21:00,3, GSM1: Cannot open serial port /dev/ttyUSB2, error: Device or resource busy
2017-07-03 02:21:00,2, GSM1: Modem handler 0 terminated. PID: 12084, was started 17-07-03 02:20:30, up 0 min.
2017-07-03 02:21:00,2, smsd: Modem handler 0 (GSM1) terminated while mainprocess is still running. Exited, status 127.
However I could connect to the modem manually with socat:
/var/log/smsd> sudo socat - /dev/ttyUSB2
ATI
ATI
^C
/var/log/smsd> sudo socat - /dev/ttyUSB2,crnl
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.20.03.00 r6691 CARMD-EV-FRMWR2 2016/06/30 10:54:05
MEID: ******
IMEI: ******
IMEI SV: 6
FSN: *******
+GCAP: +CGSM
OK
Note that AT commands work only with correct line termination (crnl socat option):
crnl Converts the default line termination character NL (’\n’, 0x0a) to/from CRNL ("\r\n", 0x0d0a) when writing/reading on this channel (example). Note: socat simply strips all CR characters.
Is my problem related to the line termination or something else?
I haven't found anything about line termination characters in smsd configuration manual.
My smsd config is:
devices = GSM1
logfile = /var/log/smsd/smsd.log
loglevel = 7
[GSM1]
device = /dev/ttyUSB2
incoming = yes
baudrate = 115200
eventhandler = /dev/shm/test/sms_event_handler
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