Expose config and config updates through MQTT

docs/mqtt.md

@@ -55,6 +55,10 @@ Main settings:
 `<base-topic>/shaper/set [0 | 1]`       : temporary enable (1)/ disable (0) current shaper ( doesn't survive reboot )  
 `<base-topic>/restart {"device": "gateway|evse"}` : restart the gateway or openevse module
 
+Config:
+
+`<base-topic>/config_version`           : a volatile counter incremented for each config change  
+`<base-topic>/config`                   : expose the configuration as a json object
 
 
 MQTT setup is pre-populated with OpenEnergyMonitor [emonPi default MQTT server credentials](https://guide.openenergymonitor.org/technical/credentials/#mqtt).

src/app_config.cpp

@@ -31,6 +31,8 @@
 #define FACTORY_OFFSET    CONFIG_SIZE
 #define FACTORY_SIZE      1024
 
+uint32_t config_ver = 1;
+
 // Wifi Network Strings
 String esid;
 String epass;
@@ -251,6 +253,26 @@ ConfigOpt *opts[] =
 ConfigJson user_config(opts, sizeof(opts) / sizeof(opts[0]), EEPROM_SIZE, CONFIG_OFFSET);
 ConfigJson factory_config(opts, sizeof(opts) / sizeof(opts[0]), EEPROM_SIZE, FACTORY_OFFSET);
 
+// -------------------------------------------------------------------
+// config version handling
+// -------------------------------------------------------------------
+uint32_t
+config_version() {
+  return config_ver;
+}
+
+void 
+increment_config() {
+  config_ver++;
+  DBUGVAR(config_ver);
+
+  #if ENABLE_CONFIG_CHANGE_NOTIFICATION
+  StaticJsonDocument<128> event;
+  event["config_version"] = config_ver;
+  event_send(event);
+  #endif
+}
+
 // -------------------------------------------------------------------
 // Reset EEPROM, wipes all settings
 // -------------------------------------------------------------------
@@ -368,7 +390,117 @@ bool config_deserialize(const char *json)
 
 bool config_deserialize(DynamicJsonDocument &doc)
 {
-  return user_config.deserialize(doc);
+  bool config_modified = user_config.deserialize(doc);
+
+  #if ENABLE_CONFIG_CHANGE_NOTIFICATION
+  // Update EVSE config
+  // Update the EVSE setting flags, a little low level, may move later
+  if(doc.containsKey("diode_check"))
+  {
+    bool enable = doc["diode_check"];
+    if(enable != evse.isDiodeCheckEnabled()) {
+      evse.enableDiodeCheck(enable);
+      config_modified = true;
+      DBUGLN("diode_check changed");
+    }
+  }
+
+  if(doc.containsKey("gfci_check"))
+  {
+    bool enable = doc["gfci_check"];
+    if(enable != evse.isGfiTestEnabled()) {
+      evse.enableGfiTestCheck(enable);
+      config_modified = true;
+      DBUGLN("gfci_check changed");
+    }
+  }
+
+  if(doc.containsKey("ground_check"))
+  {
+    bool enable = doc["ground_check"];
+    if(enable != evse.isGroundCheckEnabled()) {
+      evse.enableGroundCheck(enable);
+      config_modified = true;
+      DBUGLN("ground_check changed");
+    }
+  }
+
+  if(doc.containsKey("relay_check"))
+  {
+    bool enable = doc["relay_check"];
+    if(enable != evse.isStuckRelayCheckEnabled()) {
+      evse.enableStuckRelayCheck(enable);
+      config_modified = true;
+      DBUGLN("relay_check changed");
+    }
+  }
+
+  if(doc.containsKey("vent_check"))
+  {
+    bool enable = doc["vent_check"];
+    if(enable != evse.isVentRequiredEnabled()) {
+      evse.enableVentRequired(enable);
+      config_modified = true;
+      DBUGLN("vent_check changed");
+    }
+  }
+
+  if(doc.containsKey("temp_check"))
+  {
+    bool enable = doc["temp_check"];
+    if(enable != evse.isTemperatureCheckEnabled()) {
+      evse.enableTemperatureCheck(enable);
+      config_modified = true;
+      DBUGLN("temp_check changed");
+    }
+  }
+
+  if(doc.containsKey("service"))
+  {
+    EvseMonitor::ServiceLevel service = static_cast<EvseMonitor::ServiceLevel>(doc["service"].as<uint8_t>());
+    if(service != evse.getServiceLevel()) {
+      evse.setServiceLevel(service);
+      config_modified = true;
+      DBUGLN("service changed");
+    }
+  }
+
+  if(doc.containsKey("max_current_soft"))
+  {
+    long current = doc["max_current_soft"];
+    if(current != evse.getMaxConfiguredCurrent()) {
+      evse.setMaxConfiguredCurrent(current);
+      config_modified = true;
+      DBUGLN("max_current_soft changed");
+    }
+  }
+
+  if(doc.containsKey("scale") && doc.containsKey("offset"))
+  {
+    long scale = doc["scale"];
+    long offset = doc["offset"];
+    if(scale != evse.getCurrentSensorScale() || offset != evse.getCurrentSensorOffset()) {
+      evse.configureCurrentSensorScale(doc["scale"], doc["offset"]);
+      config_modified = true;
+      DBUGLN("scale changed");
+    }
+  }
+  #endif
+
+  if(config_modified)
+  {
+    #if ENABLE_CONFIG_CHANGE_NOTIFICATION
+    // HACK: force a flush of the RAPI command queue to make sure the config
+    //       is updated before we send the response
+    DBUG("Flushing RAPI command queue ...");
+    rapiSender.flush();
+    DBUGLN(" Done");
+    #endif
+
+    increment_config();
+  }
+
+  return config_modified;
 }
 
 bool config_serialize(String& json, bool longNames, bool compactOutput, bool hideSecrets)
@@ -378,6 +510,43 @@ bool config_serialize(String& json, bool longNames, bool compactOutput, bool hid
 
 bool config_serialize(DynamicJsonDocument &doc, bool longNames, bool compactOutput, bool hideSecrets)
 {
+  // Static supported protocols
+  JsonArray mqtt_supported_protocols = doc.createNestedArray("mqtt_supported_protocols");
+  mqtt_supported_protocols.add("mqtt");
+  mqtt_supported_protocols.add("mqtts");
+  JsonArray http_supported_protocols = doc.createNestedArray("http_supported_protocols");
+  http_supported_protocols.add("http");
+
+  #if ENABLE_CONFIG_CHANGE_NOTIFICATION
+  doc["buildenv"] = buildenv;
+  doc["version"] = currentfirmware;
+  doc["wifi_serial"] = serial;
+  doc["protocol"] = "-";
+  doc["espinfo"] = ESPAL.getChipInfo();
+  doc["espflash"] = ESPAL.getFlashChipSize(); 
+
+  // EVSE information are only evailable when config_version is incremented
+  if(config_ver > 0) {
+    // Read only information
+    doc["firmware"] = evse.getFirmwareVersion();
+    doc["evse_serial"] = evse.getSerial();
+    // OpenEVSE module config
+    doc["diode_check"] = evse.isDiodeCheckEnabled();
+    doc["gfci_check"] = evse.isGfiTestEnabled();
+    doc["ground_check"] = evse.isGroundCheckEnabled();
+    doc["relay_check"] = evse.isStuckRelayCheckEnabled();
+    doc["vent_check"] = evse.isVentRequiredEnabled();
+    doc["temp_check"] = evse.isTemperatureCheckEnabled();
+    doc["max_current_soft"] = evse.getMaxConfiguredCurrent();
+    // OpenEVSE Read only information
+    doc["service"] = static_cast<uint8_t>(evse.getServiceLevel());
+    doc["scale"] = evse.getCurrentSensorScale();
+    doc["offset"] = evse.getCurrentSensorOffset();
+    doc["min_current_hard"] = evse.getMinCurrent();
+    doc["max_current_hard"] = evse.getMaxHardwareCurrent();
+  }
+  #endif
+
   return user_config.serialize(doc, longNames, compactOutput, hideSecrets);
 }
 

src/app_config.h

@@ -221,6 +221,8 @@ inline EvseState config_default_state()
 // Ohm Connect Settings
 extern String ohm;
 
+extern uint32_t config_version();
+
 // -------------------------------------------------------------------
 // Load saved settings
 // -------------------------------------------------------------------

src/mqtt.cpp

@@ -35,6 +35,7 @@ uint8_t claimsVersion = 0;
 uint8_t overrideVersion = 0;
 uint8_t scheduleVersion = 0;
 uint8_t limitVersion = 0;
+uint32_t configVersion = 0;
 
 String lastWill = "";
 
@@ -300,6 +301,7 @@ mqtt_connect()
     event_send(doc);
 
     // Publish MQTT override/claim
+    mqtt_publish_config();
     mqtt_publish_override();
     mqtt_publish_claim();
     mqtt_publish_schedule();
@@ -507,6 +509,23 @@ mqtt_publish_schedule() {
   }
 }
 
+bool
+mqtt_publish_config() {
+  if(!config_mqtt_enabled() || !mqttclient.connected() || evse.getEvseState() == OPENEVSE_STATE_STARTING) {
+    return false;
+  }
+  const size_t capacity = JSON_OBJECT_SIZE(128) + 1024;
+  DynamicJsonDocument doc(capacity);
+  config_serialize(doc, true, false, true);
+  mqtt_publish_json(doc, "/config");
+
+  String fulltopic = mqtt_topic + "/config_version";
+  String payload = String(config_version());
+  mqttclient.publish(fulltopic, payload, true);
+
+  return true;
+}
+
 void
 mqtt_set_limit(LimitProperties &limitProps) {
   Profile_Start(mqtt_set_limit);
@@ -614,6 +633,11 @@ mqtt_loop() {
       DBUGF("Limit has changed, publishing to MQTT");
       limitVersion = limit.getVersion();
     }
+
+    if(configVersion != config_version() && mqtt_publish_config()) {
+      DBUGF("Config has changed, publishing to MQTT");
+      configVersion = config_version();
+    }
   }
   Profile_End(mqtt_loop, 5);
 }

src/mqtt.h

@@ -33,6 +33,7 @@ extern void mqtt_loop();
 // data: a comma seperated list of name:value pairs to send
 // -------------------------------------------------------------------
 extern void mqtt_publish(JsonDocument &data);
+extern bool mqtt_publish_config();
 extern void mqtt_publish_claim();
 extern void mqtt_set_claim(bool override, EvseProperties &props);
 extern void mqtt_publish_override();

src/web_server.cpp

@@ -78,8 +78,6 @@ void handleUpdateClose(MongooseHttpServerRequest *request);
 void handleTime(MongooseHttpServerRequest *request);
 void handleTimePost(MongooseHttpServerRequest *request, MongooseHttpServerResponseStream *response);
 
-extern uint32_t config_version;
-
 void dumpRequest(MongooseHttpServerRequest *request)
 {
 #ifdef ENABLE_DEBUG_WEB_REQUEST
@@ -253,7 +251,7 @@ void buildStatus(DynamicJsonDocument &doc) {
 
   doc["ota_update"] = (int)Update.isRunning();
 
-  doc["config_version"] = config_version;
+  doc["config_version"] = config_version();
   doc["claims_version"] = evse.getClaimsVersion();
   doc["override_version"] = manual.getVersion();
   doc["schedule_version"] = scheduler.getVersion();