Envisalink DSC 2DS / 3 / 4 Alarm Server (TPI Proxy & HTTP/JSON API).

AlarmServer enables connections of multiple clients with Envisalink TPI interface.

This is a patched and improved version of the original repo https://github.com/juggie/AlarmServer

Docker image: mathompl/alarmserver-docker-fixed:latest

Problem & Fix

Envisalink connections would sometimes become unresponsive, causing the proxy to hang indefinitely. Restarting AlarmServer or EVL was required.

Root cause:
Envisalink allows only one TCP client at a time. Old connections were not properly closed, preventing new ones from being established.

This update fixes:

• Aggressive cleanup of previous connections before reconnect
• Improved reconnection logic and error handling (StreamClosedError, timeouts)
• Sequential and stable login procedure
• Automatic Envisalink reboot after max reconnection attempts
• Better state management (_connected, _reconnecting, _busy)
• Implements alarmserver<>evl keepalive
• other minor fixes, code cleanup, error handling, proper logging, config cleanup and python 3.8 migration

Proxy now responds 999 when not connected to EVL.