wrong mac address from received message

[jordigrau83]

Hi!
First thanks for your work, its a nice project!
I tried the example 7 that sends a message to every node on the mesh, it sends the messages correctly, but there's a weird thing on the mac address on the received messages.

To try everyting I'm sending a string with sender and receiver MAC adresses.

• with only 2 nodes A B, everything is ok, both get the message from the correct source m2mMesh.getMeshAddress(m2mMesh.sourceId()) :

  Node A get message from B and Mac address from message is B
  Node B get message from A and Mac address from message is A

• with 3 nodes A B C, all receive the messages correctly, BUT the m2mMesh.sourceId() is WRONG:

  Node A get message from B and Mac address from message is C
  Node A get message from C and Mac address from message is B

  Node B get message from A and Mac address from message is C
  Node B get message from C and Mac address from message is A

  Node C get message from A and Mac address from message is B
  Node C get message from B and Mac address from message is A