Support parent search without node ID

To not break existing functionality parent search can be started when
node ID is still unknown. In this case node ID is set to broadcast ID,
which can cause funky stuff to happen...

Author: Yveaux

libraries/MySensors/MySensor.cpp

@@ -81,7 +81,7 @@ void MySensor::begin(void (*_msgCallback)(const MyMessage &), uint8_t _nodeId, b
 		requestNodeId();
 	}
 
-	debug(PSTR("%s started, id %d\n"), repeaterMode?"repeater":"sensor", nc.nodeId);
+	debug(PSTR("%s started, id=%d, parent=%d, distance=%d\n"), repeaterMode?"repeater":"sensor", nc.nodeId, nc.parentNodeId, nc.distance);
 
 	// Open reading pipe for messages directed to this node (set write pipe to same)
 	RF24::openReadingPipe(WRITE_PIPE, TO_ADDR(nc.nodeId));
@@ -148,7 +148,8 @@ void MySensor::findParentNode() {
 	debug(PSTR("find parent\n"));
 
 	build(msg, nc.nodeId, BROADCAST_ADDRESS, NODE_SENSOR_ID, C_INTERNAL, I_FIND_PARENT, false).set("");
-	sendWrite(BROADCAST_ADDRESS, msg);
+	// Write msg, but suppress recursive parent search
+	sendWrite(BROADCAST_ADDRESS, msg, false);
 
 	// Wait for ping response.
 	waitForReply();
@@ -195,12 +196,16 @@ boolean MySensor::sendRoute(MyMessage &message) {
 	return false;
 }
 
-boolean MySensor::sendWrite(uint8_t next, MyMessage &message) {
+boolean MySensor::sendWrite(uint8_t next, MyMessage &message, const bool allowFindParent) {
 	bool ok = true;
 	const bool broadcast = next == BROADCAST_ADDRESS;
-	const bool toParent  = !broadcast && (next == nc.parentNodeId);
+	const bool toParent  = next == nc.parentNodeId;
+	// With current implementation parent node Id can equal the broadcast address when
+	// starting with empty eeprom and AUTO node Id is active.
+	// This behavior is undesired, as possible parents will report back to broadcast address.
+//	debug(PSTR("sendWrite next=%d, parent=%d, distance=%d\n"), next, nc.parentNodeId, nc.distance);
 	// If sending directly to parent node and distance is not set, then try to find parent now.
-	if ( toParent && !isValidDistance(nc.distance) ) {
+	if ( allowFindParent && toParent && !isValidDistance(nc.distance) ) {
 		findParentNode();
 		// Known distance indicates parent has been found
 		ok = isValidDistance(nc.distance);
@@ -219,7 +224,8 @@ boolean MySensor::sendWrite(uint8_t next, MyMessage &message) {
 		RF24::startListening();
 
 		debug(PSTR("send: %d-%d-%d-%d s=%d,c=%d,t=%d,pt=%d,l=%d,st=%s:%s\n"),
-				message.sender,message.last, next, message.destination, message.sensor, mGetCommand(message), message.type, mGetPayloadType(message), mGetLength(message), ok?"ok":"fail", message.getString(convBuf));
+				message.sender,message.last, next, message.destination, message.sensor, mGetCommand(message), message.type,
+				mGetPayloadType(message), mGetLength(message), broadcast ? "bc" : (ok ? "ok":"fail"), message.getString(convBuf));
 
 		// If many successive transmissions to parent failed, the parent node might be down and we
 		// need to find another route to gateway.

libraries/MySensors/MySensor.h

@@ -254,7 +254,7 @@ class MySensor : public RF24
 	void setupRepeaterMode();
 	void setupRadio(rf24_pa_dbm_e paLevel, uint8_t channel, rf24_datarate_e dataRate);
 	boolean sendRoute(MyMessage &message);
-	boolean sendWrite(uint8_t dest, MyMessage &message);
+	boolean sendWrite(uint8_t dest, MyMessage &message, const bool allowFindParent = true );
 
   private:
 #ifdef DEBUG