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I have tried to increase the read_timeout to 60 seconds without improvement. 11:41:13,7, SiemensMC35i: Command is sent, waiting for the answer…. 11:41:13,7, SiemensMC35i: put_command expected (>)|(ERROR), timeout occurred. 11:41:08,7, SiemensMC35i: Command is sent, waiting for the answer 11:41:08,6, SiemensMC35i: Checking if Modem is registered to the network 11:41:08,6, SiemensMC35i: Sending SMS from to xxxxxxxxxx 11:41:08,6, SiemensMC35i: I have to send 1 short message for /var/spool/sms/checked/send_sGIFSE 11:41:07,7, SiemensMC35i: Command is sent, waiting for the answer 11:41:06,7, SiemensMC35i: Command is sent, waiting for the answer 11:41:03,7, SiemensMC35i: Command is sent, waiting for the answer 11:41:02,7, SiemensMC35i: Command is sent, waiting for the answer 11:41:02,6, SiemensMC35i: Checking if Modem is registered to the network 11:41:02,6, SiemensMC35i: Sending SMS from to xxxxxxxxxx 11:41:02,6, SiemensMC35i: I have to send 1 short message for /var/spool/sms/checked/send_cuVXbA
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11:41:01,6, SiemensMC35i: Deleted file /var/spool/sms/checked/send_fBQupr This is a piece of the log file with the timeout : I've also tried experimenting with different baud rates but that seemed to make it even worse. I use a rather slow Siemens MC35i so I’ve tried to set the read_timeout to 20 seconds but even that didn’t seem to solve the problem. “put_command expected (>)|(ERROR), timeout occurred” This seems to be caused by timeouts occurring. About 1 out of 4 SMS messages I try to send get lost in the process.