after restart of mqtt broker, pv data cannot be set

[Rumbelstilzchen]

Steps to reproduce:

1. Start mqtt broker - e.g. mosquitto
2. Restart Go-E charger
3. send every 5s data to ids/set e.g.: {"ppv":0,"pakku":4056.735596,"pgrid":-16.98193359}
4. check received data: http://charger.ip/api/status?filter=ppv,pakku,pgrid
   --> works as expected

Restart mqtt broker:

• PV data sender reconnects automatically to broker
• charger reconnects to broker and its topics get updated
• (according to mqtt explorer everything looks fine)

checking received data via http://charger.ip/api/status?filter=ppv,pakku,pgrid yields only null

Workaround:

• call http://charger.ip/api/set?rst=1 within reconnect method of sender
• wait app. 30s before sending data
  --> received data: http://charger.ip/api/status?filter=ppv,pakku,pgrid is there again