mirror of https://github.com/espruino/BangleApps
121 lines
3.1 KiB
JavaScript
121 lines
3.1 KiB
JavaScript
/**
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* Copyright reelyActive 2024
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* We believe in an open Internet of Things
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*/
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// Non-user-configurable constants
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const APP_ID = 'openlocatebeacon';
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const ADVERTISING_OPTIONS = { showName: false, interval: 5000 };
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// Global variables
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let bar, gps;
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let sequenceNumber = 0;
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// Menus
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let mainMenu = {
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"": { "title": "OpenLocateBcn" },
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"Lat": { value: null },
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"Lon": { value: null },
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"Altitude": { value: null },
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"Satellites": { value: null }
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};
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// Encode the OpenLocate geo location element advertising packet
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function encodeGeoLocationElement() {
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let lci = new Uint8Array(16);
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let seqFrag = ((sequenceNumber++ & 0x0f) << 4) + 0x01;
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let rfc6225lat = toRfc6225Coordinate(gps.lat);
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let rfc6225lon = toRfc6225Coordinate(gps.lon);
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let rfc6225alt = toRfc6225Altitude(bar.altitude);
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lci[0] = rfc6225lat.integer >> 7;
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lci[1] = ((rfc6225lat.integer & 0xff) << 1) + (rfc6225lat.fraction >> 24);
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lci[2] = (rfc6225lat.fraction >> 16) & 0xff;
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lci[3] = (rfc6225lat.fraction >> 8) & 0xff;
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lci[4] = rfc6225lat.fraction & 0xff;
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lci[5] = rfc6225lon.integer >> 7;
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lci[6] = ((rfc6225lon.integer & 0xff) << 1) + (rfc6225lon.fraction >> 24);
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lci[7] = (rfc6225lon.fraction >> 16) & 0xff;
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lci[8] = (rfc6225lon.fraction >> 8) & 0xff;
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lci[9] = rfc6225lon.fraction & 0xff;
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lci[10] = bar.altitude ? 0x10 : 0x00;
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lci[11] = (rfc6225alt.integer >> 16) & 0xff;
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lci[12] = (rfc6225alt.integer >> 8) & 0xff;
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lci[13] = rfc6225alt.integer & 0xff;
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lci[14] = rfc6225alt.fraction & 0xff;
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lci[15] = 0x41;
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return [
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0x02, 0x01, 0x06, // Flags
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0x16, 0x16, 0x94, 0xfd, 0x09, seqFrag, 0x30, lci[0], lci[1], lci[2],
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lci[3], lci[4], lci[5], lci[6], lci[7], lci[8], lci[9], lci[10], lci[11],
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lci[12], lci[13], lci[14], lci[15]
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];
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}
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// Convert a latitude or longitude coordinate to RFC6225
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function toRfc6225Coordinate(coordinate) {
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let integer = Math.floor(coordinate);
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let fraction = Math.round((coordinate - integer) * 0x1ffffff);
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if(integer < 0) {
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integer += 0x1ff + 1;
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}
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return { integer: integer, fraction: fraction };
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}
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// Convert altitude to RFC6225
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function toRfc6225Altitude(altitude) {
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if(!altitude) {
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return { integer: 0, fraction: 0 };
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}
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let integer = Math.floor(altitude);
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let fraction = Math.round((altitude - integer) * 0xff);
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if(integer < 0) {
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integer += 0x3fffff + 1;
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}
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return { integer: integer, fraction: fraction };
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}
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// Update barometer
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Bangle.on('pressure', (newBar) => {
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bar = newBar;
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mainMenu.Altitude.value = bar.altitude.toFixed(1) + 'm';
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E.showMenu(mainMenu);
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});
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// Update GPS
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Bangle.on('GPS', (newGps) => {
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gps = newGps;
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mainMenu.Lat.value = gps.lat.toFixed(4);
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mainMenu.Lon.value = gps.lon.toFixed(4);
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mainMenu.Satellites.value = gps.satellites;
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E.showMenu(mainMenu);
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if(!isNaN(gps.lat) && !isNaN(gps.lon)) {
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NRF.setAdvertising(encodeGeoLocationElement(), ADVERTISING_OPTIONS);
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}
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else {
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NRF.setAdvertising({}, { name: "Bangle.js" });
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}
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});
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// On start: enable sensors and display main menu
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g.clear();
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Bangle.setGPSPower(true, APP_ID);
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Bangle.setBarometerPower(true, APP_ID);
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E.showMenu(mainMenu); |