i would like to add a special character (0xdf) to a payload string instead of the “****”:
payload: '{"x":0,"y":3,"txt":"Wh: {{trigger.payload_json.t[:-1]}}**** {{trigger.payload_json.h[:-1]}}% {{trigger.payload_json.i[:-1]}}"}'
how do i escape this character?
i tried to look for it but didn’t find how to do it - anyone knows how to do this?
Have you tried something like
payload: '{"x":0,"y":3,"txt":"Wh: {{trigger.payload_json.t[:-1]}}chr(0xdf){{trigger.payload_json.h[:-1]}}% {{trigger.payload_json.i[:-1]}}"}'
?
just did - this was the output:
{"x":0,"y":3,"txt":"Wh: 29.0chr(0xdf) 35.0% 28.2"}
well, then substitute that **** with {{ chr(0xdf) }}
that was my 1st thought, but it makes the configuration invalid with the error:
Invalid config for [automation]: invalid template (TemplateSyntaxError: expected token ‘,’, got ‘xdf’) for dictionary value @ data[‘action’][0][‘data_template’][‘payload’]. Got None. (See /home/homeassistant/.homeassistant/configuration.yaml, line 40). Please check the docs at Automation - Home Assistant
ok. why don’t you run that chr(0xdf) in python and then paste that special character into your template?
i’m not sure what you mean - i also tried this but got the same error
payload: >
{% set ch = chr(0xdf) %}
'{"x":0,"y":3,"txt":"Wh: {{trigger.payload_json.t[:-1]}}{{ch}} {{trigger.payload_json.h[:-1]}}% {{trigger.payload_json.i[:-1]}}"}'
ß
Try and copy paste that ^^
That’s because Jinja does not have chr function, it’s not Python.
I meant that you can get character with the code above by running Python interpreter and executing that chr(0xdf).
Just use the symbol nickrout provided where you need it.
since i couldn’t solve it, i’ve decided to use a workaround - sending a special (valid) character which won’t be used, and replacing it on the arduino with 0xdf char.
didn’t copy/paste of that special character work?
and how do you perform the replacement on arduino?
sorry - didn’t understand what needs to be done here - can you explain?. what i did was to send char (*) and scanning/replacing the string at the arduino side.
I meant to send something like this
payload: '{"x":0,"y":3,"txt":"Wh: {{trigger.payload_json.t[:-1]}}ß {{trigger.payload_json.h[:-1]}}% {{trigger.payload_json.i[:-1]}}"}'
use {{ '\xdf' }}
payload: >
{% set v = trigger.payload_json.t[:-1] + '\xdf ' + trigger.payload_json.h[:-1] + '% ' + trigger.payload_json.i[:-1] %}
'{"x":0,"y":3,"txt":"Wh":"{{v}}"}'
That will only work if the encoding of the file (where the template resides) can handle that character.
Thanks! works fine 
it would be great if you could mark a post with the solution as a solution 
sorry - thx - done
