Allow flash strings in present() to save RAM (#1198)

Author: tekka007

core/MySensorsCore.cpp

@@ -355,9 +355,20 @@ bool present(const uint8_t childSensorId, const uint8_t sensorType, const char *
              const bool ack)
 {
 	return _sendRoute(build(_msgTmp, GATEWAY_ADDRESS, childSensorId, C_PRESENTATION, sensorType,
-	                        ack).set(childSensorId==NODE_SENSOR_ID?MYSENSORS_LIBRARY_VERSION:description));
+	                        ack).set(childSensorId == NODE_SENSOR_ID ? MYSENSORS_LIBRARY_VERSION : description));
 }
 
+#if !defined(__linux__)
+bool present(const uint8_t childSensorId, const uint8_t sensorType,
+             const __FlashStringHelper *description,
+             const bool ack)
+{
+	return _sendRoute(build(_msgTmp, GATEWAY_ADDRESS, childSensorId, C_PRESENTATION, sensorType,
+	                        ack).set(childSensorId == NODE_SENSOR_ID ? F(" MYSENSORS_LIBRARY_VERSION "): description));
+}
+#endif
+
+
 bool sendSketchInfo(const char *name, const char *version, const bool ack)
 {
 	bool result = true;

core/MySensorsCore.h

@@ -137,10 +137,14 @@ void presentNode(void);
 */
 bool present(const uint8_t sensorId, const uint8_t sensorType, const char *description="",
              const bool ack = false);
-
+#if !defined(__linux__)
+bool present(const uint8_t childSensorId, const uint8_t sensorType,
+             const __FlashStringHelper *description,
+             const bool ack = false);
+#endif
 /**
  * Sends sketch meta information to the gateway. Not mandatory but a nice thing to do.
- * @param name String containing a short Sketch name or NULL  if not applicable
+ * @param name String containing a short Sketch name or NULL if not applicable
  * @param version String containing a short Sketch version or NULL if not applicable
  * @param ack Set this to true if you want destination node to send ack back to this node. Default is not to request any ack.
  * @return true Returns true if message reached the first stop on its way to destination.
@@ -153,7 +157,6 @@ bool sendSketchInfo(const __FlashStringHelper *name, const __FlashStringHelper *
 
 /**
 * Sends a message to gateway or one of the other nodes in the radio network
-*
 * @param msg Message to send
 * @param ack Set this to true if you want destination node to send ack back to this node. Default is not to request any ack.
 * @return true Returns true if message reached the first stop on its way to destination.