Add BTHome thermometer

apps/bthometemp/ChangeLog

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+0.01: New App!

apps/bthometemp/README.md

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+# BTHome Temperature and Pressure
+
+This app displays temperature and pressure and advertises them over bluetooth using BTHome.io standard (along with battery level)
+
+This can be used to integrate with [Home Assistant](https://www.home-assistant.io/), so you can use your Bangle as a wireless temperature/pressure sensor.
+
+More info on the standard at https://bthome.io
+
+And the data format used is https://bthome.io/format/

apps/bthometemp/app-icon.js

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+require("heatshrink").decompress(atob("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"))

apps/bthometemp/app.js

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+// history of temperature/pressure readings
+var history = [];
+
+// When we get temperature...
+function onTemperature(p) {
+  // Average the last 5 temperature readings
+  while (history.length>4) history.shift();
+  history.push(p);
+  var avrTemp = history.reduce((i,h)=>h.temperature+i,0) / history.length;
+  var avrPressure = history.reduce((i,h)=>h.pressure+i,0) / history.length;
+  var t = require('locale').temp(avrTemp).replace("'","°");
+  // Draw
+  var rect = Bangle.appRect;
+  g.reset(1).clearRect(rect.x, rect.y, rect.x2, rect.y2);
+  var x = (rect.x+rect.x2)/2;
+  var y = (rect.y+rect.y2)/2 + 10;
+  g.setFont("6x15").setFontAlign(0,0).drawString("Temperature:", x, y - 65);
+  g.setFontVector(50).setFontAlign(0,0).drawString(t, x, y-25);
+  g.setFont("6x15").setFontAlign(0,0).drawString("Pressure:", x, y+15 );
+  g.setFont("12x20").setFontAlign(0,0).drawString(Math.round(avrPressure)+" hPa", x, y+40);
+  // Set Bluetooth Advertising
+  // https://bthome.io/format/
+  var temp100 = Math.round(avrTemp*100);
+  var pressure100 = Math.round(avrPressure*100);
+
+  Bangle.bleAdvert[0xFCD2] = [ 0x40, /* BTHome Device Information
+              bit 0: "Encryption flag"
+              bit 1-4: "Reserved for future use"
+              bit 5-7: "BTHome Version" */
+
+              0x01, // Battery, 8 bit
+              E.getBattery(),
+
+              0x02, // Temperature, 16 bit
+              temp100&255,temp100>>8,
+
+              0x04, // Pressure, 16 bit
+              pressure100&255,(pressure100>>8)&255,pressure100>>16
+  ];
+  NRF.setAdvertising(Bangle.bleAdvert);
+}
+
+// Gets the temperature in the most accurate way with pressure sensor
+function drawTemperature() {
+  Bangle.getPressure().then(p =>{if (p) onTemperature(p);});
+}
+
+if (!Bangle.bleAdvert) Bangle.bleAdvert = {};
+setInterval(function() {
+  drawTemperature();
+}, 10000); // update every 10s
+Bangle.loadWidgets();
+Bangle.setUI({
+  mode : "custom",
+  back : function() {load();}
+});
+E.showMessage("Reading temperature...");
+drawTemperature();

apps/bthometemp/metadata.json

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+{ "id": "bthometemp",
+  "name": "BTHome Temperature and Pressure",
+  "shortName":"BTHome T",
+  "version":"0.01",
+  "description": "Displays temperature and pressure, and advertises them over bluetooth using BTHome.io standard",
+  "icon": "app.png",
+  "tags": "bthome,bluetooth,temperature",
+  "supports" : ["BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"bthometemp.app.js","url":"app.js"},
+    {"name":"bthometemp.img","url":"app-icon.js","evaluate":true}
+  ]
+}