Introduce EVSE Manager configuration option for failing charging if t…

[florinmihut]

…he powermeter has errors

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• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• I read the contribution documentation and made sure that my changes meet its requirements

[Pietfried]

Please add the added errors which now cause the evse manager to become Inoperative to the documentation in the doc.rst

[Pietfried]

Currently, a transaction can never be started if call_start_transaction at the powermeter returns UNEXPECTED_ERROR. My suggestion would be to use the introduced configuration option to control this flow.

I think we should check config.fail_on_powermeter_errors in this line too:

everest-core/modules/EvseManager/Charger.cpp

Line 1206 in add88f3

if (response.status == types::powermeter::TransactionRequestStatus::UNEXPECTED_ERROR) {

and we should not return early in case fail_on_powermeter_errors is false so that we can still start the transaction.

This would mean the fail_on_powermeter_errors option controls:

• If transactions can be started if call_start_transaction at the powermeter returns UNEXPECTED_ERROR.
• If charging is stopped during a transaction if a powermeter raises an error

What do you think @corneliusclaussen @florinmihut ?

I would suggest that we move the changes of the powermeter documentation PR into this PR.

[florinmihut]

Made the requested changes and add the documentation as mermaid files.