RFLink TCP mode does not implement ping to keep connection alive - connection times out

[genestealer]

The problem

HA RFLink does not perform connection maintenance in TCP mode to keep connection alive. It should periodically perform the "ping" command keep connection, else after 300 seconds the connection times-out. RFlink implements a hello-protocol (see http://www.rflink.nl/blog2/protref) where if the client sends “10;PING;” RFlink replies back with “20;99;PONG;”.

Raised in forum: Implement RFlink ping

Environment

• Home Assistant Core release with the issue: 0.115.6
• Last working Home Assistant Core release (if known): N/A
• Operating environment (OS/Container/Supervised/Core): HassOS 4.13
• Integration causing this issue: RFLink
• Link to integration documentation on our website: https://www.home-assistant.io/components/rflink/

Problem-relevant configuration.yaml

Traceback/Error logs

2020-10-05 00:13:59 INFO (MainThread) [rflink.protocol] disconnected because of close/abort.
2020-10-05 00:14:00 DEBUG (MainThread) [rflink.protocol] connected

Additional information

Workaround:

# Example configuration.yaml entry
sensor:
  - platform: command_line
    name: RFLink Keep Alive Command
    command: 'echo "10;PING;" | nc 192.168.2.22 23'
    scan_interval: 60 #seconds

[genestealer]

Tagging @lbschenkel and @aequitas

[javicalle]

I think that an approach like this can be implemented for RFLink serial connections (when host: None).

[github-actions]

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This issue has now been marked as stale and will be closed if no further activity occurs. Thank you for your contributions.

[genestealer]

This is still an open issue

[cpainchaud]

I can only upvote this! actually it may be easier to tweak TCP KeepAlive settings, I would have done it myself if I was able to tell where TCP socket is created in the code!

[genestealer]

Fantastic, thank you so much for implementing this.