Modbus controller (#1779)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/modbus_controller/sensor/modbus_sensor.cpp

@@ -0,0 +1,36 @@
+
+#include "modbus_sensor.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace modbus_controller {
+
+static const char *const TAG = "modbus_controller.sensor";
+
+void ModbusSensor::dump_config() { LOG_SENSOR(TAG, "Modbus Controller Sensor", this); }
+
+void ModbusSensor::parse_and_publish(const std::vector<uint8_t> &data) {
+  union {
+    float float_value;
+    uint32_t raw;
+  } raw_to_float;
+
+  float result = payload_to_float(data, *this);
+
+  // Is there a lambda registered
+  // call it with the pre converted value and the raw data array
+  if (this->transform_func_.has_value()) {
+    // the lambda can parse the response itself
+    auto val = (*this->transform_func_)(this, result, data);
+    if (val.has_value()) {
+      ESP_LOGV(TAG, "Value overwritten by lambda");
+      result = val.value();
+    }
+  }
+  ESP_LOGD(TAG, "Sensor new state: %.02f", result);
+  // this->sensor_->raw_state = result;
+  this->publish_state(result);
+}
+
+}  // namespace modbus_controller
+}  // namespace esphome