ESPHome Telegram bot send message example

telegram.yaml

substitutions:
  TELEGRAM_BOT_TOKEN: !secret telegram_bot_token
  api_key: !secret api_key
  ota_password: !secret ota_password
  chat_id: xxxxxxxxx

esphome:
  name: wemos
  friendly_name: wemos

esp8266:
  board: d1_mini_pro

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: ${api_key}

ota:
  password: ${ota_password}

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

captive_portal:
  
status_led:
  pin: GPIO2

http_request:
  useragent: esphome/device
  timeout: 10s

button:
  - platform: template
    name: Send Telegram message
    on_press:
      - http_request.post:
          url: "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage"
          headers:
            Content-Type: application/json
          json:
            chat_id: ${chat_id}
            text: Message from ESPHome
          verify_ssl: false

in case anyone is still using this post... here is how I got telegram working on ESPhome - thanks to original contributor for the excellent headstart...

substitutions:
  TELEGRAM_BOT_TOKEN: !secret telegram_bot_token
  mychat_id: "-1234567890" # replace with your numeric chat ID, keep the minus symbol if a group/channel. Note the need of quotes

esp32: # in case anything is board specific and you want to know what board this worked on
  board: esp32-s3-devkitc-1
  framework:
    type: esp-idf

http_request:
#  useragent: esphome/device  # Keeping this line in just did not work for me. Commented out and voila it worked.
  timeout: 10s

binary_sensor:
  - platform: gpio
(YOUR CODE)
    on_press:
      - http_request.post:
          url: "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage"
          request_headers:
            Content-Type: application/json
          json:
            chat_id: ${mychat_id}
            text: "Message from ESPHome"