Add grid and EVSE meter components with load balancer

components/meter_orno_modbus/include/orno_modbus.h

@@ -0,0 +1,22 @@
+#ifndef ORNO_MODBUS_H_
+#define ORNO_MODBUS_H_
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    ORNO_METER_GRID,
+    ORNO_METER_EVSE
+} orno_meter_type_t;
+
+esp_err_t orno_modbus_init(void);
+esp_err_t orno_modbus_read_current(orno_meter_type_t type, float *current);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ORNO_MODBUS_H_ */