Powerpal smart energy monitor

Feature Requests
575

My re-batteried Powerpal worked fine for days, then today it stalled and refused to send any more updates. Exactly the same symptoms as when the battery went flat.

I thought my Powerpal was faulty, but having nothing really to lose I actually ended up going through a bizarrely useful debug session with ChatGPT. It suggested that manually sending the Powerpal a RTC clock update might get it going again, and it did! So if this happens to anyone else after a battery replacement, this is what Chatty came up with:

time:
  - platform: homeassistant
    id: homeassistant_time

button:
  - platform: template
    name: "Powerpal: Set Device Time (now)"
    on_press:
      - ble_client.ble_write:
          id: powerpal
          service_uuid: '59DAABCD-12F4-25A6-7D4F-55961DCE4205'
          characteristic_uuid: '59DA0004-12F4-25A6-7D4F-55961DCE4205'   # time
          value: !lambda |-
            uint32_t t = id(homeassistant_time).now().timestamp;
            return std::vector<uint8_t>{
              (uint8_t)(t      ), (uint8_t)(t >> 8),
              (uint8_t)(t >> 16), (uint8_t)(t >> 24)
            };
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