Feature request: firmware-local message repeats

[bobrippling]

I've been interested for some time in being able to control my boiler using ebusd. This is possible using messages such as the SetModeOverride.

Problem

With these messages, the boiler expects an update every 10 minutes (source) on SetMode, otherwise it resets to default.

My concern is that my boiler must have its heating set to constant/on, and then rely on these messages every 10 minutes to turn it off when I don't want to use it. If there was an issue with ebusd or the host on which ebusd runs, the boiler would run away with the heating on.

Feature

What are your thoughts on a feature where the firmware can repeat a message by itself, without an active ebusd connection? This could then be configured once by ebusd, so if ebusd terminated or the host otherwise crashed, the ebus adapter would be able to maintain the boiler by repeating this message every 10 minutes.

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SetMode summary

(mostly notes for myself / anyone interested)

SetModeOverride

Using this as a summary of all the discussions I've found to be useful:

• difficulty with the write command ebusd#179
  • Specifically these comments:
    • The message: difficulty with the write command ebusd#179 (comment)
    • Scripting: Vaillant ecoTEC pure automatic modulation and SetMode ebusd-configuration#242 (comment)
    • Details on parameters: Vaillant ecoTEC pure automatic modulation and SetMode ebusd-configuration#242 (comment)
• How do I write FlowTempDesired ? ebusd#190
• Duplicate messages when polling values over mqtt ebusd#170
• Modulation always 20% or overwritten by the heater ebusd-configuration#220
• Still cannot set heating flow temperature on ecotec plus ebusd-configuration#114
• cannot write to burner (reading is ok) ebusd#364

And possibly for circulation pumps too (john30/ebusd-configuration#135).

which, to summarise here for anyone else wanting to do the same, we can use to make these messages writable (assuming your boiler accepts them):

• SetMode (above links)
• Help needed, controlling flow temp without controller ebusd-configuration#78 and How to set desired temperature for BAI00 ebusd-configuration#120 (comment)
  • FlowsetHcMax
  • SetTempdesired

While these don't seem to be writable:

• HwcTempDesired
• FlowTempDesired

There are other messages we're not sure about, which we may be able to configure too:

• ecoTEC plus unknown messages ebusd-configuration#111
• Help needed, controlling flow temp without controller ebusd-configuration#78 (hex command found for controlling boiler)

HomeAssistant / MQTT setup

• Vaillant Ecotec without controller ebusd-configuration#170 (comment)
• SetMode (passive write) not visible on MQTT ebusd#214
• Custom message definitions not working through MQTT ebusd#211
• difficulty with MQTT /set having multiple parameters ebusd#828 (comment)