OpenWRT 23.03 and SIM7600E not connect

[igodor]

I installed your version of the chan-quectel plugin on a router with OpenWRT with a Simcom SIM7600E modem.
Asterisk 20.5.2, openwrt 23.05.3
Cannot establish a connection to the modem, a connection error occurs and constantly reconnects.

-- [quectel0] Trying to connect on /dev/ttyUSB2...
-- [quectel0] Connected, initializing...
-- [quectel0] Manufacturer: SIMCOM INCORPORATED
[quectel0] SimCOM module
== [quectel0] Model: SIMCOM_SIM7600E
== [quectel0] Revision identification: LE11B04SIM7600M21-A
== [quectel0] IMEI: 800000000000000
== [quectel0] IMSI: 250000000000000
[quectel0] Location area code: 4E2B
[quectel0] Cell ID: 16F45B1
== [quectel0] SMS service centre: +79000000000
== [quectel0] ICCID: +CCID: 8970000000000000000
== [quectel0] ICCID: 8970000000000000000
[Jun 19 11:50:03] NOTICE[7136]: src/at_response.c:2629 at_response_cpcmreg: [quectel0] SimCom - Voice channel inactive
[Jun 19 11:50:03] ERROR[9437]: src/monitor_thread.c:119 check_dev_status: [quectel0][DATA] Lost connection: I/O error
-- [quectel0] Error initializing channel
[Jun 19 11:50:03] WARNING[9437]: src/tty.c:32 tty_close_lck: [TTY] Unable to disable exlusive mode for /dev/ttyUSB2: I/O error
-- [quectel0] Disconnected
-- [quectel0] Trying to connect on /dev/ttyUSB2...
-- [quectel0] Connected, initializing...
-- [quectel0] Manufacturer: SIMCOM INCORPORATED
[quectel0] SimCOM module
== [quectel0] Model: SIMCOM_SIM7600E
== [quectel0] Revision identification: LE11B04SIM7600M21-A
== [quectel0] IMEI: 800000000000000
== [quectel0] IMSI: 250000000000000
[quectel0] Location area code: 4E2B
[quectel0] Cell ID: 16F45B1
== [quectel0] SMS service centre: +79000000000
== [quectel0] ICCID: +CCID: 8970000000000000000
== [quectel0] ICCID: 8970000000000000000
[Jun 19 11:51:03] NOTICE[7136]: src/at_response.c:2629 at_response_cpcmreg: [quectel0] SimCom - Voice channel inactive
[Jun 19 11:51:03] ERROR[9628]: src/monitor_thread.c:119 check_dev_status: [quectel0][DATA] Lost connection: I/O error
-- [quectel0] Error initializing channel
[Jun 19 11:51:03] WARNING[9628]: src/tty.c:32 tty_close_lck: [TTY] Unable to disable exlusive mode for /dev/ttyUSB2: I/O error
-- [quectel0] Disconnected
-- [quectel0] Trying to connect on /dev/ttyUSB2...
-- [quectel0] Connected, initializing...
-- [quectel0] Manufacturer: SIMCOM INCORPORATED
[quectel0] SimCOM module
== [quectel0] Model: SIMCOM_SIM7600E
== [quectel0] Revision identification: LE11B04SIM7600M21-A
== [quectel0] IMEI: 800000000000000
== [quectel0] IMSI: 250000000000000
[quectel0] Location area code: 4E2B
[quectel0] Cell ID: 16F45B1
== [quectel0] SMS service centre: +79000000000
== [quectel0] ICCID: +CCID: 8970000000000000000
== [quectel0] ICCID: 8970000000000000000
[Jun 19 11:52:03] NOTICE[7136]: src/at_response.c:2629 at_response_cpcmreg: [quectel0] SimCom - Voice channel inactive
[Jun 19 11:52:03] ERROR[9637]: src/monitor_thread.c:119 check_dev_status: [quectel0][DATA] Lost connection: I/O error
-- [quectel0] Error initializing channel
[Jun 19 11:52:03] WARNING[9637]: src/tty.c:32 tty_close_lck: [TTY] Unable to disable exlusive mode for /dev/ttyUSB2: I/O error
-- [quectel0] Disconnected

Everything works correctly on the original plugin(https://github.com/IchthysMaranatha/asterisk-chan-quectel).
Can you tell me what settings need to be made?

[RoEdAl]

• Maybe some other services/processes accessing /dev/ttyUSB2?
• Maybe other devices in chan_quectel are configured to use /dev/ttyUSB2?
• Maybe you're running Asterisk as root?
• This may be also a serious powering issue.

[igodor]

How to check if another process is in use on this ttyUSB2 port?
Only 1 device quectel0 is configured in quectel.conf: data=/dev/ttyUSB2 audio=/dev/ttyUSB4
Asterisk was started by the user ssterisk and dialout,audio groups
User "asterisk" has been added to the dialout and audio groups
No problem with power supply

[RoEdAl]

How to check if another process is in use on this ttyUSB2 port?

This is OpenWRT with rather limited number of services. Also, lsof utility may be used.

No problem with power supply

Have you at least checked output of logread (dmesg) command?

[mpmc]

I had something similar to this on the GL-XE300 on Openwrt with the EC25, turns out I had made two mistakes.

• Hadn't actually added asterisk to the correct group. I'd actually added the non user dialout to the asterisk group. So my /etc/group had the incorrect line of asterisk:x:385:asterisk,dialout instead of the correct dialout:x:20:asterisk.
• Not realised that the GL-XE300 had it's own usb-serial, so all ttyusb's were shifted up by one.

That was a fun evening on lack of sleep!

Mostly off-topic (but slighty related?)

I also had some fun trying to power the SIM7600G [4G pi hat and USB version of the same thing from Waveshare], and two Quectel EP06!

No matter what USB3 hubs/power supplies/routers I've tried so far, (3 so far and a Belkin RT1800 AX router, all the hubs can power a 2a + USB hard drive no problem). Still, the bloody modules would boot up then reset when I tried to use them. I've yet to find a reliable way to power them without resetting/looping due to the power draw bursts.

I think having a wiki page of known good methods to power the modules might be a good idea?

[RoEdAl]

Mostly off-topic

• It is a good idea to get persistent TTY device names using udev rules. On OpenrWRT you may try my hotplug script.
• You may try this little gadget from Olimex.