[OpenTRV-dev] Help getting serial connection to Radbot

[Damon Hart-Davis]

Have you woken up the CLI by sending any character (though CR is a good one)?

You should at least be seeing a JSON data frame anyway every couple of minutes at 4800 8n1.

Rgds

Damon

> On 14 Feb 2021, at 18:24, Robert May <rob at themayfamily.me.uk <mailto:rob at themayfamily.me.uk>> wrote:
> 
> I've finally found time to unbox my Radbots.   The plan is to build a combined stats hub and boiler controller based on a RPi.
> 
> I've successfully compiled the code Christoph shared (https://github.com/wintersteiger/wlmcd <https://github.com/wintersteiger/wlmcd>) and used to to show the one Radbot I've powered up transmits and that I can receive the frames using a CC1101/RPi combination.  Of course the decryption fails as I've yet to set a decryption key.
> 
> I'm struggling to get a connection over the serial port to the Radbot.  I'm trying to follow the instructions shared by Tristan (https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs <https://github.com/tyrken/heatmon/wiki/Reprogramming-Radbot-TRVs>) but I can't seem to get any comms over the serial port.
> 
> I've opened up my radbot to get better access to the pads.
> I'm powering the Radbot from a bench power supply at 3.0V
> I've got a USB serial dongle operating at 3.3V logic, grounded to the -ve supply.
> I think I'm hold the rx/tx lines on the pads (tx from my dongle to rx on the radbot and rx on the dongle to tx on the Radbot), but I get nothing from 'screen' that I'm using for my terminal.
> 
> As far as I know I'm using 4800baud, 8-N-1 (screen /dev/ttyUSB0 4800), which I believ to be the expected settings?
> 
> Can anyone see anything that I'm doing wrong or give me a pointer to things that I can try. ?
> 
> Thanks,
> Rob.
> 
> 
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