esp32.cpp: Add custom OCPP key to configure MaxCurrent of the controller

Author: mstegen

SmartEVSE-3/src/esp32.cpp

@@ -2213,6 +2213,10 @@ void ocppInit() {
 
     //load OCPP library modules: Mongoose WS adapter and Core OCPP library
 
+    // Declare custom "ConfigureMaxCurrent" key
+    // Parameters: key name, default value, filename for persistence (optional, use CONFIGURATION_FN for default), readonly, rebootRequired, restricted
+    MicroOcpp::declareConfiguration<int>("ConfigureMaxCurrent", 16, CONFIGURATION_FN, false, false, true);
+
     auto filesystem = MicroOcpp::makeDefaultFilesystemAdapter(
             MicroOcpp::FilesystemOpt::Use_Mount_FormatOnFail // Enable FS access, mount LittleFS here, format data partition if necessary
             );
@@ -2428,6 +2432,18 @@ void ocppLoop() {
 
     mocpp_loop();
 
+    // handle Configuration updates
+
+    auto config = MicroOcpp::getConfigurationPublic("ConfigureMaxCurrent");
+    if (config) {
+        uint16_t current = config->getInt();
+        // Check against max and min currents, only write settings when value changes
+        if ((current >= 6) && (current <= 80) && (MaxCurrent != current)) {
+            MaxCurrent = current;
+            write_settings();            
+        } 
+    }
+
     //handle RFID input
 
     if (OcppTrackLastRfidUpdate != OcppLastRfidUpdate) {