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Welcome, Guest. Please login or register. Mon Jun 24, 2024 13:13
SMSTools3 Community » Help and support Bottom

Sierrawireless EM7455 - Device or resource busy

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Author Post
Jul 2017
Location: France
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:

However I could connect to the modem manually with socat:

Note that AT commands work only with correct line termination (crnl socat option):

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:

« Last edit by em7455 on Mon Jul 03, 2017 17:45, 84 months ago. »
Jul 2017
Location: France
Topic owner
115200 is the correct baud rate for this modem:

May 2009
Location: Jyväskylä, Finland
I think that the problem is not related to the line termination. Smsd uses CR only, and it has been enough for all modems so far.

I do not know what is causing the error "Device or resource busy", when at the same time socat works well. I tested this on openSUSE 42.2 with Huawei USB stick and smsd 3.1.21 from sources, and everything worked fine. I think that you could use lsof | grep /dev/ttyUSB2 to get a clue about the process which is using the device.

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