Task-05: txtsnd and packetdump are not compatible

[LordTy]

Description

When 2 separate hardware nodes for the tutorial, you can try to txtsnd from one node to the other, but packetdump will not show the packet.
Thus you cannot see if a packet was received correctly.

Steps to reproduce

1. Compile and flash task-05 on 2 nodes with the same radio (for example esp8266).
2. Send from node 1 using txtsnd.
3. Look in the terminal for node 2.

Expected results

A packet is received and dumped to the shell in node 2.

Actual results

Nothing happens in node 2.