MQTT reporting system status

[henriklund]

Describe your problem I use a standard MQTT JSON for receiving data. On the previous version I had installed (v2.1.14) this worked as a charm. However, after v.2.2.3 I noted my graphs have started to get 'holes' in them. Further investigation shows that the reason is that the MQTT reports a normal data package (list 4) immediately followed by 'System data'. Since I pull the tPI information for the overall state of the entity, I had to create a workaround to get the value from previous message. This is not pretty since it relies on the assumption of a specific order in messages. Secondly I pull all data and apply those as the entities attribute. Those data (attributes) are used in various Grafana graphs. The introduction of a (almost) blank 'System data' message means that once every minute, attributes will be blank since the 'System data' message does not contain any relevant data (similar to list 4).

I thus wonder what purpose the 'System data' serves, and if there is any way to avoid this message? I do recognize that there is an option to use 'Home Assistant' format for MQTT. However, I created my setup prior to this, and it has been working flawlessly ever since (well until now).

Hardware information:

• Country: DK
• Meter: Kampstrup
• Encryption enabled: yes
• AMS reader: Pow-K ESP8266
• M-bus adapter (if applicable): N/A
• Relevant firmware information:

Version: 2.2.3

• MQTT: yes
• MQTT payload type: JSON
• HAN GPIO: GPIO3 (according to configfile)
• HAN baud and parity: 2400 8N1
• Temperature sensors: N/A
• ENTSO-E API enabled: yes (although ESP8266 does not provide possibility to enter ENTSO-E API key)