How to keep an ODROID device connectable via adb?


Question

I'm using an Odroid (rooted) device running Android 5.1.1 on a local network and I'd like to be able to control it via adb.



Currently I'm running this at startup:



setprop service.adb.tcp.port 5555
stop adbd
start adbd


This works initially, but I've noticed if works with one connection at a time.
If a connection is left open, a second connection won't work.
Even though adb says I'm connected, whenever I try to run any command I get an error:



> adb connect 192.168.0.33
connected to 192.168.0.33:5555
> adb shell date
error: device offline


What's the easiest to ensure adbd is accessible, even if a connection is left open/hanging by accident ?



I'm thinking about running a script that periodically restarts adbd but having a short interval
will be very frustrating as I'd need to constantly reconnect. Is there a way to check if a connection
is open, but hanging ? (no data has been received in a while ?)



Alternatively, would it be possible to close the previous connection if a new one is made automatically ?



How would one keep an odroid connectible via adb constantly (regardless of open connections ?)


Answer

For the scope of the project at that time there were two measures that helped:




  1. Installing SSHelper to add SSH support (can use SSH instead of adb and restart adb daemon in case it gets locked)

  2. Hacky, but a background service could be used to periodically reset adb connections: this could cause trouble depenending on what commands need to run and for how long


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