[Question] AlignedDataSendDuringIdle and J01.FR.19

[Wolfy7]

I'm trying to understand the correct implementation of the AlignedDataSendDuringIdle configuration variable in relation to the OCPP 2.0.1 specification requirements J01.FR.19 and J01.FR.20.

Current Implementation

The codebase contains a comment referencing J01.FR.20 in meter_values.cpp:34:

// J01.FR.20 if AlignedDataSendDuringIdle is true and any transaction is active, 
// don't send clock aligned meter values
if (this->context.device_model
        .get_optional_value<bool>(ControllerComponentVariables::AlignedDataSendDuringIdle)
        .value_or(false)) {
    for (auto const& evse : this->context.evse_manager) {
        if (evse.has_active_transaction()) {
            return; // Don't send ANY clock-aligned meter values
        }
    }
}

This implementation checks the global AlignedDataSendDuringIdle variable and stops sending clock-aligned meter values for all EVSEs if any transaction is active on any EVSE.

Specification Details

According to the OCPP 2.0.1 specification, AlignedDataSendDuringIdle has:

Questions

1. Which requirement applies?

• Is J01.FR.19 or J01.FR.20 the correct requirement for this behavior?
• What is the difference between these two requirements?

2. Current behavior vs. specification:

• The current implementation uses only the global variable (no EVSE-specific lookup)
• It stops sending meter values for all EVSEs when any transaction is active
• Is this the intended "global fallback" behavior when no EVSE-specific value is configured?

3. EVSE-specific implementation:

• Should the implementation check for EVSE-specific AlignedDataSendDuringIdle values?

Could you help clarify:

• The correct interpretation of J01.FR.19 and J01.FR.20