Support of device Heidemann HX 70372,70835,70836 range extension for door bells

[nospam2000]

I want to add support for the Heidemann HX 70372,70835,70836 range extension for door bells device.
I already created the implementation on a branch, but there is still work to do before I can raise a merge request.

The branch can be found here if anybody wants to have a look at it. The implementation is in this file.

The frames are 13 bit long but the content it is not totally clear. It contains at least a 6 bit id, but the rest is unclear.
The bits 0..3, 8 and 12 are always zero. I need to test with an empty battery to check if any of those bits is a batttery low bit.

If anyone has information about those bits, please post below

[ProfBoc75]

@nospam2000 , We need few sample codes to confirm, but from my point of view flex decoder convert into a simple conf file is enough to decode this, no need to create a decoder.
Look at conf folder, you have examples there and may be your door bell device ?

[nospam2000]

@ProfBoc75 I added a flex decoder here, but I'm still testing

[nospam2000]

@ProfBoc75 The flex decoder works fine now, so the C code is no longer needed. The 'battery_ok' field is most probably a constant and can be removed or could be used for integrity check.

I collected 12 test data sample files. All have been created using the same distance between sender and SDR using this command: ../build/src/rtl_433 -c ../conf/heidemann_hx_extension.conf -R 0 -R 300 -S known -g 20

Shall I upload all of them? They contain two different id values and some different melody values.
Are additional files from a higher distance also needed (with more noise)?

Here you can see the extracted information for both the C decoder as well as the flex decoder:

for i in *.cu8 ; do ../build/src/rtl_433 -F json -R 0 -R 300 -c ../conf/heidemann_hx_extension.conf -r $i 2>/dev/null  | jq -c ".filename=\"$i\""; done

{"time":"@0.289840s","model":"Heidemann-HX-Extension","id":180,"melody":1,"battery_ok":1,"filename":"g002_433.92M_250k.cu8"}
{"time":"@0.289840s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da08","battery_ok":1,"id":180,"melody":1,"filename":"g002_433.92M_250k.cu8"}
{"time":"@0.272996s","model":"Heidemann-HX-Extension","id":180,"melody":1,"battery_ok":1,"filename":"g004_433.92M_250k.cu8"}
{"time":"@0.272996s","model":"Heidemann-HX-Extension-Cfg","count":25,"num_rows":25,"len":13,"data":"da08","battery_ok":1,"id":180,"melody":1,"filename":"g004_433.92M_250k.cu8"}
{"time":"@0.287588s","model":"Heidemann-HX-Extension","id":180,"melody":3,"battery_ok":1,"filename":"g017_433.92M_250k.cu8"}
{"time":"@0.287588s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da18","battery_ok":1,"id":180,"melody":3,"filename":"g017_433.92M_250k.cu8"}
{"time":"@0.287436s","model":"Heidemann-HX-Extension","id":180,"melody":5,"battery_ok":1,"filename":"g040_433.92M_250k.cu8"}
{"time":"@0.287436s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da28","battery_ok":1,"id":180,"melody":5,"filename":"g040_433.92M_250k.cu8"}
{"time":"@0.314844s","model":"Heidemann-HX-Extension","id":180,"melody":5,"battery_ok":1,"filename":"g041_433.92M_250k.cu8"}
{"time":"@0.314844s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da28","battery_ok":1,"id":180,"melody":5,"filename":"g041_433.92M_250k.cu8"}
{"time":"@0.070564s","model":"Heidemann-HX-Extension","id":180,"melody":5,"battery_ok":1,"filename":"g042_433.92M_250k.cu8"}
{"time":"@0.070564s","model":"Heidemann-HX-Extension-Cfg","count":34,"num_rows":35,"len":13,"data":"da28","battery_ok":1,"id":180,"melody":5,"filename":"g042_433.92M_250k.cu8"}
{"time":"@0.086368s","model":"Heidemann-HX-Extension","id":180,"melody":5,"battery_ok":1,"filename":"g043_433.92M_250k.cu8"}
{"time":"@0.086368s","model":"Heidemann-HX-Extension-Cfg","count":50,"num_rows":50,"len":13,"data":"da28","battery_ok":1,"id":180,"melody":5,"filename":"g043_433.92M_250k.cu8"}
{"time":"@0.286468s","model":"Heidemann-HX-Extension","id":180,"melody":9,"battery_ok":1,"filename":"g071_433.92M_250k.cu8"}
{"time":"@0.286468s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da48","battery_ok":1,"id":180,"melody":9,"filename":"g071_433.92M_250k.cu8"}
{"time":"@0.284824s","model":"Heidemann-HX-Extension","id":180,"melody":14,"battery_ok":1,"filename":"g116_433.92M_250k.cu8"}
{"time":"@0.284824s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da70","battery_ok":1,"id":180,"melody":14,"filename":"g116_433.92M_250k.cu8"}
{"time":"@0.286372s","model":"Heidemann-HX-Extension","id":180,"melody":6,"battery_ok":1,"filename":"g124_433.92M_250k.cu8"}
{"time":"@0.286372s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"da30","battery_ok":1,"id":180,"melody":6,"filename":"g124_433.92M_250k.cu8"}
{"time":"@0.289360s","model":"Heidemann-HX-Extension","id":221,"melody":1,"battery_ok":1,"filename":"g127_433.92M_250k.cu8"}
{"time":"@0.289360s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"ee88","battery_ok":1,"id":221,"melody":1,"filename":"g127_433.92M_250k.cu8"}
{"time":"@0.284008s","model":"Heidemann-HX-Extension","id":221,"melody":3,"battery_ok":1,"filename":"g144_433.92M_250k.cu8"}
{"time":"@0.284008s","model":"Heidemann-HX-Extension-Cfg","count":49,"num_rows":50,"len":13,"data":"ee98","battery_ok":1,"id":221,"melody":3,"filename":"g144_433.92M_250k.cu8"}