Initial version

apps/bootbthomebatt/ChangeLog

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+0.01: Initial release.

apps/bootbthomebatt/README.md

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+# BLE BTHome Battery Service
+
+Broadcasts battery remaining percentage over BLE using the BTHome protocol
+
+## Usage
+
+This boot code runs in the background and has no user interface.
+
+Based on [BootGATTBat](https://github.com/espruino/BangleApps/tree/master/apps/bootgattbat) by [Jonathan Jefferies](https://github.com/jjok).
+
+## Creator
+
+[Deirdre O'Byrne](https://github.com/deirdreobyrne)

apps/bootbthomebatt/boot.js

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+(() => {
+  var btHomeSequenceNo = 0;
+  function advertiseBTHomeBattery() {
+    require("ble_advert").set(0xFCD2, [0x40,0x00,btHomeSequenceNo,0x01,E.getBattery()]);
+    btHomeSequenceNo = (btHomeSequenceNo + 1) & 255;
+  }
+
+  setInterval(advertiseBTHomeBattery, 5 * 60 * 1000);
+  advertiseBattery();
+})();

apps/bootbthomebatt/metadata.json

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+{
+  "id": "bootbthomebatt",
+  "name": "BLE BTHome Battery Service",
+  "shortName": "BTHome Battery Service",
+  "version": "0.01",
+  "description": "Broadcasts battery remaining over bluetooth using the BTHome protocol.\n",
+  "icon": "bluetooth.png",
+  "type": "bootloader",
+  "tags": "battery,ble,bluetooth,bthome",
+  "supports": ["BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"bthomebat.boot.js","url":"boot.js"}
+  ]
+}