Add grid and EVSE meter components with load balancer

components/gridmeter/src/gridmeter_events.c

@@ -0,0 +1,3 @@
+#include "gridmeter.h"
+
+ESP_EVENT_DEFINE_BASE(GRIDMETER_EVENT);

components/gridmeter/src/gridmeter_modbus.c

@@ -0,0 +1,22 @@
+#include "gridmeter.h"
+#include "orno_modbus.h"
+#include "esp_event.h"
+#include "esp_log.h"
+
+static const char *TAG = "gridmeter_modbus";
+
+esp_err_t gridmeter_init(void)
+{
+    ESP_LOGI(TAG, "Initializing grid meter (Modbus)");
+    return orno_modbus_init();
+}
+
+esp_err_t gridmeter_read_current(float *current)
+{
+    esp_err_t err = orno_modbus_read_current(ORNO_METER_GRID, current);
+    if (err == ESP_OK)
+    {
+        esp_event_post(GRIDMETER_EVENT, GRIDMETER_EVENT_UPDATE, current, sizeof(float), portMAX_DELAY);
+    }
+    return err;
+}