Convert float to text

ESPHome
1

Using this code:

    on_value:
      then:
        - mqtt.publish_json:
            topic: domoticz/in
            payload: |-
              root["idx"] = 259;
              root["nvalue"] = 0;
              root["svalue"] = id(roomtemp).state;

My mqtt subscriber gets this payload:

{“idx”:259,“nvalue”:0,“svalue”:20.125}

The problem is I need the temperature (20.125) to be a string such that in the payload it has quotes around it like this:

{“idx”:259,“nvalue”:0,“svalue”:“20.125”}

Can someone please help me solve this? Thank you.

2

try if it accepts:
id(roomtemp).state.c_str()

3

That does not work. I forget the exact error because I had tried that a while ago. Thank you though.

4

Did you try if the payload will take an Arduino String class? Below code will initialize the String to the numeric value in the parameter. If the payload needs a c string the .c_str() can be added after the last ). For idf framework might need to add correct #include or use std::string.

‘’’
root[“svalue”] = String( id(roomtemp).state );
‘’’

5

That worked! How simple. Here’s the working code:

sensor:
  - platform: dallas_temp
    id: roomtemp
    name: "Room Temperature"
    update_interval: 10s
    on_value:
      then:
        - mqtt.publish_json:
            topic: domoticz/in
            payload: |-
              root["idx"] = 259;
              root["nvalue"] = 0;
              root["svalue"] = String(id(roomtemp).state);

A payload of {“idx”:259,“nvalue”:0,“svalue”:“20.125”} is delivered. Thank you so much!

1 Like