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Not sure if you ever found the answer, but this post may be of interest: http://www.domoticaforum.eu/viewtopic.php?f=75&t=11419

Bart

Just for information. Here is the way I managed to get all of this to work (for those that are interested): NEST heatlink (for zone 1): - OpenTherm interface of the heatlink connects to Gateway (regular install) - The NEST heatlink also has a relais contact (request heat from boiler). I connected th...

Can you send me the latest (4.2.5) version by email? Then I will use that as base, and may send back usefull changes back to you. I plan to add the 2 new GA/GB commands described in my latest reply in http://www.domoticaforum.eu/viewtopic.php?f=75&t=11419

The NEST received firmware upgrades after installation. I will run a log and post, but I suggest I post any on that as reply in http://www.domoticaforum.eu/viewtopic.php?f=75&t=10897 as this topic is not about the NEST but about making a 2 zone system. On this topic: The bottom line is I think I...

[ The right title is: "Multi zone system setup (with NEST + on/off thermostat" ] My central heating system has 2 zones: Zone 1: main part of house with thermostat in the living room - the thermostat can open/close a electric valve towards the floor heating Zone 2: basement area - with trad...

When rebuilding the source files I noticed the hex file on the site does not match the file generated by the sources. I seems the source files on http://otgw.tclcode.com/download.html are version 4.2.4 where the downloadable hex file is version 4.2.5. Would you please be so kind to update the source...