Esphomeyaml: How to create custom payload for component?

ESPHome
1

Hi

I want to use ESP32 boards with ble_rssi component with home assistant MQTT Room Presence. For this i need to send custom payload from esphomeyaml. Was trying for some time but without succes. Maybe someone here have better C++ knowledge and can help me with this??

My code that can send RSSI value to custom Topic

     - platform: ble_rssi
    mac_address: 84:A4:66:89:75:8E
    name: "beacon"
    id: rssi_beacon
    on_value:
    - mqtt.publish:
        topic: home_presence
        payload: !lambda >-
          char[3] rssi;
          double rssitemp=id(rssi_sygonix).value;
          dtostrf(rssitemp, 2, 0, rssi);
          return rssi;

This code will send RSSI value to Payload, i payload like this:

{
  "id": "84:A4:66:89:75:8E",
  "name": "beacon",
  "distance": 78
}

Any ideas??

1 Like
2

Was able to make it works :slight_smile:

  - platform: ble_rssi
    mac_address: 84:A4:66:89:75:8E
    name: "Beacon"
    id: rssi_beacon
    on_value:
    - mqtt.publish:
        topic: home_presence/room_1
        payload: !lambda >-
          double ratio = id(rssi_sygonix).value/-59;
          double distancetemp = (0.89)* pow(ratio,7.7095) + 0.11;  
          char distance[sizeof(distancetemp)+1];
          dtostrf(distancetemp,2,3,distance);
          std::string payload;
          payload.append("{\"id\":\"84:A4:66:89:75:8E\",\"name\":\"Beacon\",\"distance\":");
          payload.append(distance);
          payload.append("}");
          return payload;```

btw. now im sending calculated distance (not RSSI) in payload

2 Likes
3

in version 1.9 u can publish mqtt message via mqtt.publish_json action:

…
- platform: ble_rssi
mac_address: 84:A4:66:89:75:8E
name: “Sygonix”
id: rssi_sygonix
on_value:
- mqtt.publish_json:
topic: home_presence/room_1
payload: |-
root[“id”] = “84:A4:66:89:75:8E”;
root[“name”] = “sygonix”;
root[“distance”] = (0.89)* pow(id(rssi_sygonix).value/-59,7.7095) + 0.11;
…

1 Like
4

could you please send the whole code for ESP?
I can’t make work it out

5 
esp32_ble_tracker:
  scan_interval: 10s
  id: 'dev_ble'

sensor:
  - platform: ble_rssi
    mac_address: 84:A4:66:89:75:8E
    id: rssi_sygonix
    internal: true
    on_value:
    - mqtt.publish_json:
        topic: home_presence/room_1
        payload: |-
          root["id"] = "84:A4:66:89:75:8E";
          root["name"] = "sygonix";
          root["distance"] = (0.89)* pow(id(rssi_sygonix).state/-59,7.7095) + 0.11;