How we can add custom message in mqtt bundle when mqtt broker subscribe any State

Hello friends
I am new in this …
Please help me !
I want to add some custom string or date/time in mosquitto message which having status with it …
I am just using SmartMeter device . when device subscribe its state on mosquitto . i need to add some String and date/time with message payload .like if meter reading is 3.047 it must be like “HELLO,2017-6-22 20:02:32,3.047”
I dont know where i need to change .
Is I need to change in mqtt binding OR Zwave binding .
or some where else .
I dont know …

You need to write a rule that combines the information into a String and sends that as the MQTT message.


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