<commit_before>A simple server-sent events client for streaming HeaterMeter state using server-sent events and an ESP8266

Requires Arduino Libraries (available from the Arduino 'Manage Libraries' dialog):
ESPAsyncTCP - https://github.com/me-no-dev/ESPAsyncTCP
ArduinoJson - https://github.com/bblanchon/ArduinoJson<commit_msg>[hmc] Add AsyncTCP requirement<commit_after>A simple server-sent events client for streaming HeaterMeter state using server-sent events and an ESP8266

Requires Arduino Libraries (available from the Arduino 'Manage Libraries' dialog):
ESPAsyncTCP (for ESP8266) - https://github.com/me-no-dev/ESPAsyncTCP
AsyncTCP (for ESP32) - https://github.com/me-no-dev/AsyncTCP
ArduinoJson - https://github.com/bblanchon/ArduinoJson
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