mjhjmtu

I am using a Yocto image based on the linux-mainline kernel. I have systemd on the embedded OS that I have created.

Aim

I have a UMTS dongle connected to the board which will use usb_modeswitch to recognise the dongle and wvdial to connect to the 3G insfrastructure.

Method

I wrote a simple bash script in /usr/umts.sh as follows

#!/bin/bash

sleep 1;
usb_modeswitch --default-vendor 12d1 --default-product 1446 -J

sleep 1;
/usr/bin/tmux new-session -d -s Cloud
/usr/bin/tmux set-option set-remain-on-exit on
/usr/bin/tmux new-window -d -n 'wvdial' -t Cloud:1 'sleep 1; /usr/bin/wvdialconf; /usr/bin/wvdial';

usb_modeswitch will configure the USB Dongle and the next part will create a tmux session and trigger wvdial within.

my systemd script looks like follows in /etc/systemd/system/enable-umts.service

GNU nano 2.2.5 File: /etc/systemd/system/enable-umts.service

[Unit]
Description=Enable UMTS Dongle for Cloud Connectivity

[Service]
Type=oneshot
ExecStart=/usr/umts.sh

[Install]
WantedBy=default.target

(I have given execution rights to the script using chmod +x /usr/umts.sh)

I reloaded the daemon systemctl daemon-reload and enabled the service systemctl enable enable-umts.service

and rebooted the board (NOTE: I have only root on board and no other user)

The dmesg infact triggers the usb_modeswitch from the script above and I see related messages

[ OK ] Started Enable UMTS Dongle for Cloud Connectivity.
[ 13.051247] scsi host2: usb-storage 1-1:1.5
[ 13.067326] usb-storage 1-1:1.6: USB Mass Storage device detected
[ 13.074645] scsi host3: usb-storage 1-1:1.6
[ 13.158627] usbcore: registered new interface driver usbserial
[ 13.165501] usbcore: registered new interface driver usbserial_generic
[ 13.174754] usbserial: USB Serial support registered for generic
[ 13.202356] usbcore: registered new interface driver option
[ 13.208714] usbserial: USB Serial support registered for GSM modem (1-port)
[ 13.216468] option 1-1:1.0: GSM modem (1-port) converter detected
[ 13.229840] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[ 13.238774] option 1-1:1.3: GSM modem (1-port) converter detected
[ 13.248906] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 13.256172] option 1-1:1.4: GSM modem (1-port) converter detected
[ 13.264467] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[ 14.069960] scsi 2:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2
[ 14.088684] scsi 3:0:0:0: Direct-Access HUAWEI TF CARD Storage PQ: 0 ANSI: 2
[ 14.127686] sd 3:0:0:0: [sda] Attached SCSI removable disk
GSM modem (1-port) converter detected
] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[ 13.238774] option 1-1:1.3: GSM modem (1-port) converter detected
[ 13.248906] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 13.256172] option 1-1:1.4: GSM modem (1-port) coPassword

But upon login I try to list the sessions tmux ls and it states there are no sessions created.

The `script in fact does not fail and the service status is as follows:

● enable-umts.service - Enable UMTS Dongle for Cloud Connectivity
 Loaded: loaded (/etc/systemd/system/enable-umts.service; enabled; vendor preset: enabled)
 Active: inactive (dead) since Thu 2018-05-17 12:52:10 UTC; 4min 51s ago
 Process: 214 ExecStart=/usr/umts.sh (code=exited, status=0/SUCCESS)
 Main PID: 214 (code=exited, status=0/SUCCESS)

May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Set up interface 0
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Use endpoint 0x01 for message sending ...
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Trying to send message 1 to endpoint 0x01 ...
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: OK, message successfully sent
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Reset response endpoint 0x81
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Reset message endpoint 0x01
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Could not reset endpoint (probably harmless): -99
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: Device is gone, skip any further commands
May 17 12:52:09 phyboard-mira-imx6-3 umts.sh[214]: -> Run lsusb to note any changes. Bye!
May 17 12:52:10 phyboard-mira-imx6-3 systemd[1]: Started Enable UMTS Dongle for Cloud Connectivity.

If execute the script /usr/umts.sh as a standalone script then in fact it does everything it is supposed to do (open a new tmux session and triggers wvdial)

What is wrong here? I tried adding more sleep time but that isn't working either. Sadly there is no rc.local or cron available for the yocto image I am working on.

I added RemainAfterExit=yes|true in my systemd Script as follows:

[Unit]
Description=Enable UMTS Dongle for Cloud Connectivity

[Service]
Type=oneshot
ExecStart=/usr/umts.sh
RemainAfterExit=true
[Install]
WantedBy=default.target

Added full paths to the umts.sh script as follows:

#!/bin/bash

 sleep 1;
 /usr/bin/tmux new-session -d -s Cloud
 /usr/bin/tmux set-option set-remain-on-exit on
 /usr/bin/tmux new-window -d -n 'usb_modeswitch' -t Cloud:2 '/usr/sbin/usb_modeswitch --default-vendor 12d1 --default-product 1446 -J';

 /usr/bin/tmux new-window -d -n 'wvdial' -t Cloud:1 'sleep 10; /usr/bin/wvdialconf; /usr/bin/wvdial';

Reloaded the daemon

systemctl daemon-reload

and rebooted the board. and Found the tmux sessions created and running perfectly