traceroute needs graceful recovery from error

[roberthadow]

When traceroute fails, it fails catastrophically. It needs to be refactored to exit gracefully rather than hanging the system.

For testing pruposes, I have a bash script on my Ubuntu system with lines like this:

meshtastic --host 192.168.1.202 --traceroute '!b03dbb38'

When the command fails, it hangs in the terminal, typically something like this:

Exception in thread Thread-19:
Traceback (most recent call last):
  File "/home/rhadow/miniconda3/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "/home/rhadow/miniconda3/lib/python3.12/threading.py", line 1431, in run
    self.function(*self.args, **self.kwargs)
  File "/home/rhadow/miniconda3/lib/python3.12/site-packages/meshtastic/mesh_interface.py", line 1116, in callback
    self.sendHeartbeat()
  File "/home/rhadow/miniconda3/lib/python3.12/site-packages/meshtastic/mesh_interface.py", line 1105, in sendHeartbeat
    self._sendToRadio(p)
  File "/home/rhadow/miniconda3/lib/python3.12/site-packages/meshtastic/mesh_interface.py", line 1180, in _sendToRadio
    self._sendToRadioImpl(toRadio)
  File "/home/rhadow/miniconda3/lib/python3.12/site-packages/meshtastic/stream_interface.py", line 120, in _sendToRadioImpl
    self._writeBytes(header + b)
  File "/home/rhadow/miniconda3/lib/python3.12/site-packages/meshtastic/tcp_interface.py", line 79, in _writeBytes
    self.socket.send(b)

...
It may generate a couple more threads, then just stop with

BrokenPipeError: [Errno 32] Broken pipe

Instead of returning control to the bash script, it just hangs.

It needs to detect the error, grafeully exit with notification, then allow the bash script to continue.

[roberthadow]

This issue duplicates #765.