mirror of https://github.com/espruino/BangleApps
71 lines
1.6 KiB
JavaScript
71 lines
1.6 KiB
JavaScript
(() => {
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function setupHRMAdvertising() {
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/*
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* This function prepares BLE heart rate Advertisement.
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*/
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NRF.setAdvertising(
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{
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0x180d: undefined
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},
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{
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// We need custom Advertisement settings for Apps like OpenTracks
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connectable: true,
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discoverable: true,
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scannable: true,
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whenConnected: true,
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}
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);
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NRF.setServices({
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0x180D: { // heart_rate
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0x2A37: { // heart_rate_measurement
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notify: true,
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value: [0x06, 0],
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},
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0x2A38: { // Sensor Location: Wrist
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value: 0x02,
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}
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}
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});
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}
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function updateBLEHeartRate(hrm) {
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/*
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* Send updated heart rate measurement via BLE
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*/
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if (hrm === undefined || hrm.confidence < 50) return;
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try {
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NRF.updateServices({
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0x180D: {
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0x2A37: {
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value: [0x06, hrm.bpm],
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notify: true
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},
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0x2A38: {
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value: 0x02,
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}
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}
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});
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} catch (error) {
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if (error.message.includes("BLE restart")) {
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/*
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* BLE has to restart after service setup.
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*/
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NRF.disconnect();
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}
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else if (error.message.includes("UUID 0x2a37")) {
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/*
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* Setup service if it wasn't setup correctly for some reason
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*/
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setupHRMAdvertising();
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} else {
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console.log("[bootgatthrm]: Unexpected error occured while updating HRM over BLE! Error: " + error.message);
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}
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}
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}
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setupHRMAdvertising();
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Bangle.on("HRM", function (hrm) { updateBLEHeartRate(hrm); });
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})();
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