- 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/MutexTracker.h

@@ -63,7 +63,7 @@ class MutexTracker
     /**
      * Attempt to capture the mutex.
      * 
-     * @returns True if mutex was caught (meaning no other instance is holding the mutex). False otherwise.
+     * @return True if mutex was caught (meaning no other instance is holding the mutex). False otherwise.
      */
     bool attemptMutexCapture(bool &mutexToCapture);
 };