Add support for ORNO WE-517 Modbus Power Meter

[maximevince]

Description:

This PR adds support for the ORNO WE-517 3-phase power meter with modbus.
By connecting a UART <-> RS485 converter to the Serial RX/TX lines, Tasmota can read out the meter.

I used 8E1 as the serial power config. I am not sure if this is support by SoftwareSerial?
It might only work on the hardware serial port now.

Also, I have no ESP32 to test, so only ESP8266 was tested.

Related issue (if applicable): No related issue, this is support for a new power meter.

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on Tasmota core ESP8266 V.2.7.4.1
• The code change is tested and works on core ESP32 V.1.12.2
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[Jason2866]

CI fail in Tasmota32 sensors /home/runner/work/Tasmota/Tasmota/tasmota/xnrg_17_ornowe517.ino:183:39: error: 'GPIO_WE517_RX' was not declared in this scope
Working okay if you can not test but compilation has to be successful

[maximevince]

CI fail in Tasmota32 sensors /home/runner/work/Tasmota/Tasmota/tasmota/xnrg_17_ornowe517.ino:183:39: error: 'GPIO_WE517_RX' was not declared in this scope
Working okay if you can not test but compilation has to be successful

Okay thanks, the issue is fixed now. All checks passing.

[arendst]

See here #9237 (comment) why on hold

[arendst]

Thx. Just merged with needed changes.

[maximevince]

Awesome! 👍

[Bitfriemler22]

I like the driver very much. The meter is perfect for my use and the driver does everything that is needed, thanks maximevince.
But I found a minor typo in xnrg_17_ornowe517.ino: The address for "Phase 2 volt amps reactive" shall be "0x0028".

[maximevince]

I like the driver very much. The meter is perfect for my use and the driver does everything that is needed, thanks maximevince. But I found a minor typo in xnrg_17_ornowe517.ino: The address for "Phase 2 volt amps reactive" shall be "0x0028".

Thanks for noticing!
I have created an additional pull request with the fix here:
#14841