Signalk / Issue resuming GPSD connection

[damien]

To all,

I have found a work around ; please fell free to comment as it is certainly not the most appropriate.

Idea:
 * Use local GPSD daemon on openplotter to retrieve the GPS (and potential AIS data) so that the connection to GPSD is never lost.
 * Concern : what happen if local GPSD loose the link to GPSD running tinycore
 * Solution : small batch called by systemd for keepalive (systemd rather than

Code:

/home/pi/gpsd_keepalive
#!/bin/bash

# GPSD Keep Alive
# Initiate a connection to remote GPSD and ensure this connection stay alive
# XT211214

# Variables
SOURCE=gpsd://192.168.20.199:2947

# Script
gpsdevices=`gpspipe -r -n 2 | sed -e '$!d' -e 's/.*\[\([^]]*\)\].*/\1/g'`
#echo $gpsdevices

if [ -n "$gpsdevices" ] && [[ "$gpsdevices" =~ "$SOURCE" ]]; then
 #echo "OK"
 true
else
 #echo "Missing $SOURCE"
 # Missing source
 /usr/sbin/gpsdctl remove "$SOURCE"
 /usr/sbin/gpsdctl add "$SOURCE"
fi

Code:

/etc/systemd/system/gpsd_keepalive.timer
[Unit]
Description=Timer for GPSD KeepAlive (to cope with GPSD via networks breaks)

[Timer]
OnBootSec=30s
OnUnitInactiveSec=5s
AccuracySec=1s

[Install]
WantedBy=timers.target

Code:

/etc/systemd/system/gpsd_keepalive.service
[Unit]
Description=GPSD Keep Alive (to cope with GPSD via networks breaks)
#Documentation=
After=network.target

[Service]
WorkingDirectory=/home/pi
User=root
ExecStart=/home/pi/gpsd_keepalive

Starting the services (in root):

• systemctl start gpsd_keepalive.timer gpsd.keepalive.service
  

Xavier.