====== Gammu et le Huawei E220 ======

udev rule (file /etc/udev/rules.d/modem.rules):
  SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1001", SYMLINK+="modem_huawei_$env{ID_USB_INTERFACE_NUM}"

Ensuite, il faut prendre en compte le changement

  sudo udevadm control --reload-rules
  sudo udevadm trigger
====== Installer le nécessaire ======

  sudo apt install gammu gammu-smsd python3-gammu

====== Configurer gammu ======

  sudo usermod -aG dialout gammu
  sudo usermod -aG dip gammu
  sudo chown -R gammu.gammu /var/spool/gammu

dip est le groupe pour démarrer pppd par l'entremise de wvdial

====== Fichier de configuration de gammu-smsd ======

<file "/etc/gammu-smsdrc">
[gammu]
# Please configure this!
port = /dev/modem_huawei_02
connection = at19200
# Debugging
#logformat = textall

[smsd]
service = files
logfile = syslog
pin = 115200
# Increase for debugging information
debuglevel = 0

# Paths where messages are stored
inboxpath = /var/spool/gammu/inbox/
outboxpath = /var/spool/gammu/outbox/
sentsmspath = /var/spool/gammu/sent/
errorsmspath = /var/spool/gammu/error/
</file>

===== Configuration Gammu SMSD systemd =====

Préparation de la conf

  sudo systemctl stop gammu-smsd
  sudo systemctl disable gammu-smsd
  rm /etc/init.d/gammu-smsd


Default config /etc/default/gammu-smsd

<file /etc/default/gammu-smsd>
DAEMON_OPTS=""

# user to use (gammu is default)
GAMMU_USER=gammu
GAMMU_GROUP=gammu
</file>



Configuration du fichier systemd de gammu-smsd ''/etc/systemd/system/multi-user.target.wants/gammu-smsd.service''

<file /etc/systemd/system/multi-user.target.wants/gammu-smsd.service>
[Unit]
Description=SMS daemon for Gammu
Documentation=man:gammu-smsd(1)
After=mysql.service postgresql.service network-online.target

[Service]
EnvironmentFile=-/etc/default/gammu-smsd
# Run daemon as root user
#ExecStart=/usr/bin/gammu-smsd --pid=/var/run/gammu-smsd.pid --daemon
# Run daemon as non-root user (set user/group in /etc/sysconfig/gammu-smsd)
ExecStart=/usr/bin/gammu-smsd --user=${GAMMU_USER} --group=${GAMMU_GROUP} --pid=/var/run/gammu-smsd.pid --daemon
ExecReload=/bin/kill -HUP $MAINPID
ExecStopPost=/bin/rm -f /var/run/gammu-smsd.pid
Type=forking
PIDFile=/var/run/gammu-smsd.pid

[Install]
WantedBy=multi-user.target

</file>

Then the restart of the gammu-smsd daemon

  sudo systemctl daemon-reload
  sudo systemctl start gammu-smsd