Fix for superfluous sensor reading

[ronaldvdmeer]

As mentioned by Tim (#2) the script retrieves all results while only a few are needed. Because I don't have the multical402 I would like to ask @tvwerkhoven if he could test this pull request.

[tvwerkhoven]

@ronaldvdmeer this works up to line 335, I don't have Domoticz running so I can't test the rest.

Note that this still over-queries the meter in case you want to run multiple operations on the same index, e.g. the example command queries the meter 3x. Perhaps you could cache the values for all indices the users wants, and then run the Domoticz operations.

Command:

/usr/bin/python3 ./multical402-4-domoticz.py /dev/ttyUSB0 327:60:2:323,322:60:1:323,323:60:0

Output:

=======================================================================================
Kamstrup Multical 402 serial optical data received: 2020-11-18 20:02:41
Meter vendor/type: Kamstrup M402
---------------------------------------------------------------------------------------
Heat Energy (E1)          13.37 Gj
Heat Energy (E1)          13.37 Gj
Heat Energy (E1)          13.37 Gj

[ronaldvdmeer]

Thank you for testing this. The rest of the code was not modified so the domoticz part should still work.

On your suggestion to create a caching system to limit the IR-readouts even more I must admit I don’t feel like investing the time into something which I can not test - and no longer use - it myself.

Feel free however to fork the repository and make any adjustment you like.