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getStreaming.js
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getStreaming.js
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/* jslint es6 */
/**
* This is an example from the readme.md
* On windows you should run with PowerShell not git bash.
* Install
* [nodejs](https://nodejs.org/en/)
*
* To run:
* change directory to this file `cd examples/getStreaming`
* do `npm install`
* then `npm start`
*/
'use strict';
const OBCIConsts = require('@openbci/utilities').constants;
const OBCIWifi = require('../../openBCIWifi');
const wifi = new OBCIWifi({
debug: false, // Pretty print bytes
verbose: true, // Verbose output
sendCounts: false,
latency: 16667,
protocol: 'tcp' // or "udp"
});
let counter = 0;
let sampleRateCounterInterval = null;
let lastSampleNumber = 0;
let MAX_SAMPLE_NUMBER = 255;
let droppedPacketArray = [];
let sampleRateArray = [];
let droppedPackets = 0;
const sum = (acc, cur) => acc + cur;
const sampleFunc = (sample) => {
try {
// console.log(JSON.stringify(sample));
if (sample.valid) {
counter++;
if (sampleRateCounterInterval === null) {
sampleRateCounterInterval = setInterval(() => {
droppedPacketArray.push(droppedPackets);
sampleRateArray.push(counter);
const dpSum = droppedPacketArray.reduce(sum, 0);
const srSum = sampleRateArray.reduce(sum, 0);
console.log(`SR: ${counter}`);
console.log(`Dropped ${droppedPackets} packets`);
console.log(`Dropped packet average: ${dpSum / droppedPacketArray.length}`);
console.log(`Sample rate average: ${srSum / sampleRateArray.length}`);
droppedPackets = 0;
counter = 0;
}, 1000);
}
let packetDiff = sample.sampleNumber - lastSampleNumber;
if (packetDiff < 0) packetDiff += MAX_SAMPLE_NUMBER;
if (packetDiff > 1) {
console.log(`dropped ${packetDiff} packets | cur sn: ${sample.sampleNumber} | last sn: ${lastSampleNumber}`);
droppedPackets += packetDiff;
}
lastSampleNumber = sample.sampleNumber;
// console.log(JSON.stringify(sample));
}
} catch (err) {
console.error(err);
}
};
wifi.on(OBCIConsts.OBCIEmitterImpedance, (impedance) => {
console.log(JSON.stringify(impedance));
});
wifi.on(OBCIConsts.OBCIEmitterSample, sampleFunc);
// wifi.on(OBCIConsts.OBCIEmitterRawDataPacket, console.log);
wifi.searchToStream({
streamStart: true,
sampleRate: 200
})
.then(() => {
MAX_SAMPLE_NUMBER = wifi.getNumberOfChannels() === 4 ? 200 : 255;
})
.catch((err) => {
console.error(err);
process.exit(0);
});
function exitHandler (options, err) {
if (options.cleanup) {
if (options.verbose) console.log('clean');
/** Do additional clean up here */
if (wifi.isConnected()) wifi.disconnect().catch(console.log);
wifi.removeAllListeners('rawDataPacket');
wifi.removeAllListeners('sample');
wifi.destroy();
if (sampleRateCounterInterval) clearInterval(sampleRateCounterInterval);
}
if (err) console.error(err.stack);
if (options.exit) {
if (options.verbose) console.log('exit');
if (wifi.isStreaming()) {
const _t = setTimeout(() => {
console.log('timeout');
process.exit(0);
}, 1000);
wifi.streamStop()
.then(() => {
console.log('stream stopped');
if (_t) clearTimeout(_t);
process.exit(0);
}).catch((err) => {
console.error(err);
process.exit(0);
});
} else {
process.exit(0);
}
}
}
if (process.platform === 'win32') {
const rl = require('readline').createInterface({
input: process.stdin,
output: process.stdout
});
rl.on('SIGINT', function () {
process.emit('SIGINT');
});
}
// Perform actions on exit
process.on('exit', exitHandler.bind(null, {
cleanup: true
}));
// Perform actions on SIGINT
process.on('SIGINT', exitHandler.bind(null, {
exit: true
}));
// Perform actions on uncaught exceptions
process.on('uncaughtException', exitHandler.bind(null, {
exit: true
}));