wait for network to allow proper start of script

[dfgg12]

fix for #585

[darksidelemm]

This needs to be checked to ensure it doesn't inhibit startup on 'standalone' (no internet or network connection) machines.
I don't think this will really solve the issue, which is more about a logging.exception line spamming the log with a huge traceback. auto_rx should continue on past this exception anyway.