Operating system name and version: Windows 7
Version of smsd: 3.1.15
Smsd installed from: sources / package repository / from SMS Server Tools 3 Website
Name and model of a modem / phone: Sierra Wireless Fastrack Extend FXT009
Interface: serial / USB.

Hi Keke,
I am using the SMS Server Tools3 as a Windows Service running with a Sierra Wireless FXT009 Modem. I have set up a batch file which periodically writes a set of 5 messages every 60 seconds to the /var/spool/sms/outgoing folder. What I observe is after about 1 hour or so, I see the following error (copied from the smsd log file)
2013-09-05 13:46:42,7, Fastrac1: -> AT+CSQ 2013-09-05 13:46:42,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:46:42,7, Fastrac1: <- +CSQ: 8,0 OK 2013-09-05 13:46:42,6, Fastrac1: Signal Strength Indicator: (8,0) -97 dBm (Marginal), Bit Error Rate: less than 0.2 % 2013-09-05 13:46:42,6, Fastrac1: Checking if Modem is registered to the network 2013-09-05 13:46:42,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg4.txt to /var/spool/sms/checked/a3lVyE 2013-09-05 13:46:43,7, Fastrac1: -> AT+CREG? 2013-09-05 13:46:43,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:46:43,7, Fastrac1: <- +CREG: 2,1,"1B6C","3215" OK 2013-09-05 13:46:43,6, Fastrac1: Modem is registered to the network 2013-09-05 13:46:43,6, Fastrac1: Selecting PDU mode 2013-09-05 13:46:43,7, Fastrac1: -> AT+CMGF=0 2013-09-05 13:46:43,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:46:43,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg5.txt to /var/spool/sms/checked/CPtKH4 2013-09-05 13:46:43,7, Fastrac1: <- OK 2013-09-05 13:46:44,7, Fastrac1: -> AT+CMGS=147 2013-09-05 13:46:44,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:46:44,7, Fastrac1: <- > 2013-09-05 13:46:44,7, Fastrac1: -> 0031000B914134228159F20000FF97D0303D5D76D37520E15B0C52BEDDE5390B242C9375311648FA7EB741B286624A0D52AB531DC898944EA9206991D85004D965391D14A68372BA9A0DDE768140C8F4190D4296C3723A481AA69775A0D8ADE60281A8F2F4F95C9683EC6176BD0CEA8162B65C432195827AA0D88D050A0EA9496B929A05F540737A989E7EBBC3F2BC0B046A2800 2013-09-05 13:46:44,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:47:34,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg1.txt to /var/spool/sms/checked/0YgunK 2013-09-05 13:47:35,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg3.txt to /var/spool/sms/checked/Aps9bk 2013-09-05 13:47:35,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg2.txt to /var/spool/sms/checked/qzXi6i 2013-09-05 13:47:36,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg4.txt to /var/spool/sms/checked/n9q4Cg 2013-09-05 13:47:37,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg5.txt to /var/spool/sms/checked/pJ76Jg 2013-09-05 13:47:44,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:47:44,7, Fastrac1: <- 2013-09-05 13:47:44,3, Fastrac1: The modem did not answer (expected OK). 2013-09-05 13:47:44,5, Fastrac1: Waiting 10 sec. before retrying 2013-09-05 13:47:54,6, Fastrac1: Checking if modem is ready 2013-09-05 13:47:54,7, Fastrac1: -> AT 2013-09-05 13:47:54,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:47:59,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:47:59,7, Fastrac1: <- 2013-09-05 13:47:59,7, Fastrac1: ->  2013-09-05 13:47:59,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:04,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 3. 2013-09-05 13:48:04,7, Fastrac1: <- 2013-09-05 13:48:05,7, Fastrac1: -> AT 2013-09-05 13:48:05,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:10,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 4. 2013-09-05 13:48:10,7, Fastrac1: <- 2013-09-05 13:48:10,7, Fastrac1: ->  2013-09-05 13:48:10,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:15,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 5. 2013-09-05 13:48:15,7, Fastrac1: <- 2013-09-05 13:48:15,7, Fastrac1: -> AT 2013-09-05 13:48:15,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:20,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 6. 2013-09-05 13:48:20,7, Fastrac1: <- 2013-09-05 13:48:20,7, Fastrac1: ->  2013-09-05 13:48:20,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:25,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 7. 2013-09-05 13:48:25,7, Fastrac1: <- 2013-09-05 13:48:25,7, Fastrac1: -> AT 2013-09-05 13:48:25,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:30,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 8. 2013-09-05 13:48:30,7, Fastrac1: <- 2013-09-05 13:48:31,7, Fastrac1: ->  2013-09-05 13:48:31,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:36,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 9. 2013-09-05 13:48:36,7, Fastrac1: <- 2013-09-05 13:48:36,7, Fastrac1: -> AT 2013-09-05 13:48:36,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:38,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg1.txt to /var/spool/sms/checked/EXkT9q 2013-09-05 13:48:38,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg3.txt to /var/spool/sms/checked/ZKYtap 2013-09-05 13:48:39,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg2.txt to /var/spool/sms/checked/nB8FU9 2013-09-05 13:48:40,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg4.txt to /var/spool/sms/checked/uaV7Ep 2013-09-05 13:48:40,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg5.txt to /var/spool/sms/checked/xdcrex 2013-09-05 13:48:41,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 10. 2013-09-05 13:48:41,7, Fastrac1: <- 2013-09-05 13:48:41,7, Fastrac1: ->  2013-09-05 13:48:41,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:46,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 11. 2013-09-05 13:48:46,7, Fastrac1: <- 2013-09-05 13:48:47,7, Fastrac1: -> AT 2013-09-05 13:48:47,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:52,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:48:52,7, Fastrac1: <- 2013-09-05 13:48:53,7, Fastrac1: ->  2013-09-05 13:48:53,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:48:58,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:48:58,7, Fastrac1: <- 2013-09-05 13:48:59,7, Fastrac1: -> AT 2013-09-05 13:48:59,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:04,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:49:04,7, Fastrac1: <- 2013-09-05 13:49:04,7, Fastrac1: ->  2013-09-05 13:49:04,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:09,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:49:09,7, Fastrac1: <- 2013-09-05 13:49:10,7, Fastrac1: -> AT 2013-09-05 13:49:10,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:15,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:49:15,7, Fastrac1: <- 2013-09-05 13:49:16,7, Fastrac1: ->  2013-09-05 13:49:16,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:21,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:49:21,7, Fastrac1: <- 2013-09-05 13:49:22,7, Fastrac1: -> AT 2013-09-05 13:49:22,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:27,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:49:27,7, Fastrac1: <- 2013-09-05 13:49:27,7, Fastrac1: ->  2013-09-05 13:49:27,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:32,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:49:32,7, Fastrac1: <- 2013-09-05 13:49:34,7, Fastrac1: -> AT 2013-09-05 13:49:34,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:39,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 1. 2013-09-05 13:49:39,7, Fastrac1: <- 2013-09-05 13:49:39,7, Fastrac1: ->  2013-09-05 13:49:39,7, Fastrac1: Command is sent, waiting for the answer 2013-09-05 13:49:41,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg1.txt to /var/spool/sms/checked/y1eIcc 2013-09-05 13:49:42,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg3.txt to /var/spool/sms/checked/fBxb6D 2013-09-05 13:49:43,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg2.txt to /var/spool/sms/checked/3u6FNK 2013-09-05 13:49:43,5, smsd: Moved file /var/spool/sms/outgoing/TrialSMSMsg4.txt to /var/spool/sms/checked/gpxez7 2013-09-05 13:49:44,7, Fastrac1: put_command expected (OK)|(ERROR), timeout occurred. 2. 2013-09-05 13:49:44,7, Fastrac1: <-

My Configuration is as shown below:


Can you give me some idea on how to go about this.

The modem stopped answering, it freezed. The device still exists for OS, which means that the cable likely is not faulty. When this freezing happens, your should just restart smsd service, to see if it helps. I think that it will not help, but only one change at a time should be done when resolving the problem. If you need to disconnect and reconnect the modem to get it working, the issue is problematic. I recommend to change the modem, at least for testing.