- Add broadcast functionality.

- Add createPermanentConnections argument to attemptAutoEncryptingTransmission method.

- Reduce risk of misinterpreting acks by adding check for ack sender MAC.

- Reduce _encryptionRequestTimeoutMs from 500 ms to 300 ms since this should give enough (100 %) margin to the level where problems start appearing (150 ms timeout) and also save a lot of time in case of request failure.

- Improve comments.

libraries/ESP8266WiFiMesh/src/MeshBackendBase.cpp

@@ -134,6 +134,8 @@ void MeshBackendBase::setSSID(const String &newSSIDPrefix, const String &newSSID
 
   String newSSID = _SSIDPrefix + _SSIDRoot + _SSIDSuffix;
 
+  assert(newSSID.length() <= 31);
+
   if(getSSID() != newSSID)
   {
     _SSID = newSSID;