What i'm doing wrong?

Hello. So, i'm trying to connect a Shelly 2.5 in relay mode (2 channels). I want to control channels, which works fine, to get the Switch value (if the switch it's on or off) and to find out the consumption on any channel. (in case one switch it's on, but the consumption is 0, it's means there's a problem, and i want to message the client that the lamp it's broken). I can see in subscription de actual value, in all my necessary, but i really don't know how to put the value from subscriber, into the parser. (ex: The instant consumption from the led bulb, from subscriber, into consumption panel value) . I'm a MQTT beginner, don't really know how it's works, but i try to do my best. 

Thank you very much!