Ruuvi Collector using raspberry pi to collect and store sensor readings in an influx DB and display them with grafana.

Here are some things that will (hopefully) make this more robust.

Add influx.service to the directory /etc/systemd/system/ruuvicollector.service.requires .
This configures systemd so it knows that the influx database engine is required.
Include RestartSec=600 to minimize crash/loop problems.

# If you modify this, please also make sure to edit ./usr/lib/influxdb/scripts/init.sh
# DGG added RestartSec=600

[Unit]
Description=InfluxDB time series database
Documentation=https://docs.influxdata.com/influxdb/
After=network-online.target

[Service]
User=influxdb
Group=influxdb
LimitNOFILE=65536
EnvironmentFile=-/etc/default/influxdb
ExecStart=/usr/bin/influxd -config /etc/influxdb/influxdb.conf $INFLUXD_OPTS
KillMode=control-group
Restart=on-failure
RestartSec=600

[Install]
WantedBy=multi-user.target
Alias=influxd.service 

Revise RuuviCollectorStart.sh to

• log startup,
• wait a while because influxdb needs some time to get going (expecially after an ungraceful shutdown).
• log when it exits (with the return code).

#!/bin/bash
#           There is a link RuuviCollector, so systemctl and syslog talk nice     #    ln RuuviCollectorStart.sh RuuviCollector
# change messages and include/comment-out exit to disable this

cd "${0%/*}"; pwd
logger " ++ /lib/systemd/system/ruuvicollector.service:ExecStart=/home/pi/RuuviCollector/start.sh pwd=$PWD"
echo     ++ did start /home/pi/RuuviCollector/start.sh
logger ' ++ Did /home/pi/RuuviCollector/start.sh'
##exit 0

#  1/14/19 took 11 minutes before influx was able to accept a connection . after poweroff ?

for i in  240 220 200 180 160 140 120 100 80 60 40 20 
do
logger  " ++ RuuviCollector sleeping  $i more  seconds  to give influx a start."     #want influxdb.service ??? ( made that up
sleep 20
done

java -jar target/ruuvi-collector-*.jar
logger " ++ /home/pi/RuuviCollector/start.sh exited with rc=$?"