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decompress_UDP.js
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decompress_UDP.js
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// RFduino Node Example
// Discover and read temperature from RFduinos running the Temperature Sketch
// https://github.com/RFduino/RFduino/blob/master/libraries/RFduinoBLE/examples/Temperature/Temperature.ino
//
// (c) 2014 Don Coleman
// The above example code was modified by AJ Keller (Push The World), Joel Murphy, and Leif Percifield
// for OpenBCI, and further modified by Joel Murphy for the Pulse Patch project.
var noble = require('noble'),
rfduino = require('./simblee'),
_ = require('underscore');
var sampleCounter = 1;
var connectedPeripheral;
// var dataPacket = "";
// var packetComplete = false;
var lastPacket = null;
var dataObject;
var _peripheral;
var _sendCharacteristic;
var _bleAvailable = false;
var manualDisconnect = false;
var REDvalues = new Array();
var IRvalues = new Array();
var tempInteger;
var tempFraction;
var dieTemp = 0.0;
var lastCounter = 0;
// var thatTime = 0;
// var theOtherTime = 0;
// var failCounter = 0;
var packetCounter = 0;
var droppedPacketCounter = 0;
var goodPacket = 0;
var lastDroppedPacket;
// var packetArray = new Array(127);
// var droppedPacketArray = new Array(127);
// var droppedPacketCounters = [];
var udpOpen = false;
const udpRxPort = 10996;
const udpTxPort = 10997;
const PULSE_PATCH_CMD_STREAM_START = "b";
const PULSE_PATCH_CMD_STREAM_STOP = "s";
const UDP_CMD_CONNECT = "c";
const UDP_CMD_COMMAND = "k";
const UDP_CMD_DISCONNECT = "d";
const UDP_CMD_ERROR = "e";
const UDP_CMD_SCAN = "s";
const UDP_CMD_STATUS = "q";
const UDP_DATA = "t";
const UDP_STOP = ",;\n";
let udpRxOpen = false;
let stream;
let streaming = false;
var connected = true;
const dgram = require('dgram');
const udpRx = dgram.createSocket('udp4');
const udpTx = dgram.createSocket('udp4');
///////////////////////////////////////////////////////////////
// UDP Rx "Server" //
///////////////////////////////////////////////////////////////
udpRx.on('error', (err) => {
console.log(`udpRx error:\n${err.stack}`);
udpRx.close();
});
udpRx.on('message', (msg, rinfo) => {
console.log(`udpRx got: ${msg} from ${rinfo.address}:${rinfo.port}`);
parseMessage(msg);
});
udpRx.on('listening', () => {
var address = udpRx.address();
console.log(`udpRx listening ${address.address}:${address.port}`);
udpOpen = true;
});
udpRx.bind(udpRxPort);
///////////////////////////////////////////////////////////////
// UDP Tx "Server" //
///////////////////////////////////////////////////////////////
var parseMessage = function(msg) {
let msgElements = msg.toString().split(',');
switch (msgElements[0]) {
case UDP_CMD_CONNECT:
if(connected){
var buf = new Buffer(`${UDP_CMD_CONNECT},200,${rfduino.getAdvertisedServiceName(_peripheral)},${UDP_STOP}`);
}else{
var buf = new Buffer(`${UDP_CMD_CONNECT},402,${UDP_STOP}`);
}
udpTx.send(buf,udpTxPort);
break;
case UDP_CMD_COMMAND:
if (connected) {
parseCommand(msgElements[1]);
if(_sendCharacteristic!== null){
var out = new Buffer(msgElements[1]);
_sendCharacteristic.write(out);
console.log(`sending ${out} to Pulse Patch`);
}
} else {
error400();
}
break;
case UDP_CMD_DISCONNECT:
if (connected) {
var buf = new Buffer(`${UDP_CMD_DISCONNECT},200${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
connected = false;
} else {
error400();
}
break;
case UDP_CMD_SCAN:
var buf = new Buffer(`${UDP_CMD_SCAN},200,${rfduino.getAdvertisedServiceName(_peripheral)}${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
break;
case UDP_CMD_STATUS:
if (connected) {
var buf = new Buffer(`${UDP_CMD_STATUS},200,true${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
} else {
var buf = new Buffer(`${UDP_CMD_STATUS},200,false${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
}
break;
case UDP_CMD_ERROR:
default:
var buf = new Buffer(`${UDP_CMD_ERROR},500,Error: command not recognized${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
break;
}
}
var parseCommand = cmd => {
console.log(`parsing ${cmd}`);
switch (cmd) {
case PULSE_PATCH_CMD_STREAM_START:
console.log("start stream");
streaming = true;
droppedPacketCounter = 0;
break;
case PULSE_PATCH_CMD_STREAM_STOP:
console.log("stop stream");
streaming = false;
break;
default:
// Send message to tell driver command not recognized
udpTx.send(new Buffer(`${UDP_CMD_COMMAND},406${UDP_STOP}`), udpTxPort);
break;
}
}
function error400() {
var buf = new Buffer(`${UDP_CMD_ERROR},400,Error: No open BLE device${UDP_STOP}`);
udpTx.send(buf,udpTxPort);
}
var stop = function() {
noble.stopScanning();
};
noble.on('scanStart', function() {
console.log('Scan started');
//setTimeout(stop, 60000);
});
noble.on('scanStop', function() {
console.log('Scan stopped');
});
var onDeviceDiscoveredCallback = function(peripheral) {
_peripheral = peripheral;
console.log('\nDiscovered Peripherial ' + peripheral.uuid);
if (_.contains(_peripheral.advertisement.serviceUuids, rfduino.serviceUUID)) {
// here is where we can capture the advertisement data from the rfduino and check to make sure its ours
console.log('Device is advertising \'' + rfduino.getAdvertisedServiceName(_peripheral) + '\' service.');
console.log("serviceUUID: " + _peripheral.advertisement.serviceUuids);
_peripheral.on('connect', function() {
console.log("got connect event");
peripheral.discoverServices();
noble.stopScanning();
//connectedPeripheral = peripheral;
});
_peripheral.on('disconnect', function() {
noble.removeListener('discover', onDeviceDiscoveredCallback);
_peripheral.removeAllListeners('servicesDiscover');
_peripheral.removeAllListeners('connect');
_peripheral.removeAllListeners('disconnect');
//_peripheral = null;
console.log('Disconnected');
if (!manualDisconnect) {
autoReconnect();
}
});
_peripheral.on('servicesDiscover', function(services) {
var rfduinoService;
for (var i = 0; i < services.length; i++) {
if (services[i].uuid === rfduino.serviceUUID) {
rfduinoService = services[i];
console.log("Found simblee Service");
break;
}
}
if (!rfduinoService) {
console.log('Couldn\'t find the simblee service.');
return;
}
rfduinoService.on('characteristicsDiscover', function(characteristics) {
console.log('Discovered ' + characteristics.length + ' service characteristics');
var receiveCharacteristic;
for (var i = 0; i < characteristics.length; i++) {
console.log(characteristics[i].uuid);
if (characteristics[i].uuid === rfduino.receiveCharacteristicUUID) {
receiveCharacteristic = characteristics[i];
//break;
}
if (characteristics[i].uuid === rfduino.sendCharacteristicUUID) {
console.log("Found sendCharacteristicUUID");
_sendCharacteristic = characteristics[i];
//break;
}
}
if (receiveCharacteristic) {
receiveCharacteristic.on('read', function(data, isNotification) {
if(streaming){
processCompressedData(data);
}else{
}
});
console.log('Subscribing for data notifications');
receiveCharacteristic.notify(true);
}
});
rfduinoService.discoverCharacteristics();
});
console.log("Calling connect");
_peripheral.connect(function(err) {
console.log("connected");
// connected = true;
});
}
};
// noble.on('stateChange', function(state) {
// if (state === 'poweredOn') {
// noble.startScanning([rfduino.serviceUUID], false);
// }
// });
noble.on('stateChange', function(state) {
if (state === 'poweredOn') {
//noble.startScanning([rfduino.serviceUUID], false);
noble.startScanning();
} else {
noble.stopScanning();
}
});
noble.on('discover', onDeviceDiscoveredCallback);
function exitHandler(options, err) {
if (options.cleanup) {
console.log('clean');
//console.log(connectedPeripheral);
manualDisconnect = true;
_peripheral.disconnect();
// if(connectedPeripheral){
// noble.disconnect(connectedPeripheral.uuid);
// }
//connectedPeripheral.disconnect();
}
if (err) console.log(err.stack);
if (options.exit) {
console.log("exit");
_peripheral.disconnect();
process.exit();
}
}
var autoReconnect = function() {
if (_bleAvailable || noble.state === "poweredOn") {
noble.on('discover', onDeviceDiscoveredCallback);
noble.startScanning([rfduino.serviceUUID], false);
} else {
this.warn("BLE not AVAILABLE");
}
}
var interpret18bitAsInt32 = function(sample) {
if ((sample & 0x00020000) > 0) {
sample |= 0xFFFC0000;
} else {
sample &= 0x0003FFFF;
}
return sample;
}
var unpackSamples = function(buffer) {
var D = new Array(2);
D[0] = [0, 0, 0, 0];
D[1] = [0, 0, 0, 0];
var bufferPos = 0;
D[0][0] = ((buffer[bufferPos] & 0xFF) << 10); //111111110000000000
bufferPos++; //1
D[0][0] |= ((buffer[bufferPos] & 0xFF) << 2); //000000001111111100
bufferPos++; //2
D[0][0] |= ((buffer[bufferPos] & 0xC0) >> 6); //000000000000000011
D[1][0] = ((buffer[bufferPos] & 0x3F) << 12); //111111000000000000
bufferPos++; //3
D[1][0] |= ((buffer[bufferPos] & 0xFF) << 4); //000000111111110000
bufferPos++; //4
D[1][0] |= ((buffer[bufferPos] & 0xF0) >> 4); //000000000000011111
D[0][1] = ((buffer[bufferPos] & 0x0F) << 14); //111100000000000000
bufferPos++; //5
D[0][1] |= ((buffer[bufferPos] & 0xFF) << 6); //000011111111000000
bufferPos++; //6
D[0][1] |= ((buffer[bufferPos] & 0xFC) >> 2); //000000000000111111
D[1][1] = ((buffer[bufferPos] & 0x03) << 16); //110000000000000000
bufferPos++; //7
D[1][1] |= ((buffer[bufferPos] & 0xFF) << 8); //001111111100000000
bufferPos++; //8
D[1][1] |= (buffer[bufferPos] & 0xFF); //000000000011111111
bufferPos++; //9
D[0][2] = ((buffer[bufferPos] & 0xFF) << 10); //111111110000000000
bufferPos++; //10
D[0][2] |= ((buffer[bufferPos] & 0xFF) << 2); //000000001111111100
bufferPos++; //11
D[0][2] |= ((buffer[bufferPos] & 0xC0) >> 6); //000000000000000011
D[1][2] = ((buffer[bufferPos] & 0x3F) << 12); //111111000000000000
bufferPos++; //12
D[1][2] |= ((buffer[bufferPos] & 0xFF) << 4); //000000111111110000
bufferPos++; //13
D[1][2] |= ((buffer[bufferPos] & 0xF0) >> 4); //000000000000011111
D[0][3] = ((buffer[bufferPos] & 0x0F) << 14); //111100000000000000
bufferPos++; //14
D[0][3] |= ((buffer[bufferPos] & 0xFF) << 6); //000011111111000000
bufferPos++; //15
D[0][3] |= ((buffer[bufferPos] & 0xFC) >> 2); //000000000000111111
D[1][3] = ((buffer[bufferPos] & 0x03) << 16); //110000000000000000
bufferPos++; //16
D[1][3] |= ((buffer[bufferPos] & 0xFF) << 8); //001111111100000000
bufferPos++; //17
D[1][3] |= (buffer[bufferPos] & 0xFF); //000000000011111111
// var values = ""; // verbose
for (var j = 0; j < 4; j++) {
REDvalues[j] = interpret18bitAsInt32(D[0][j]);
// values += REDvalues[j]; values += "\t" // verbose
IRvalues[j] = interpret18bitAsInt32(D[1][j]);
// values += IRvalues[j]; values += "\n" // verbose
}
// console.log(values); // verbose
}
var processCompressedData = function(data) {
if (lastPacket !== null) {
} else {
console.log("First Packet");
}
lastPacket = data;
var packetIndex = parseInt(data[0]);
var tempAvailable = false;
switch (packetIndex) {
case 4:
//console.log(data.length);
packetCounter = parseInt(data[0]); // used to find dropped packets
var buffer = new Buffer(18);
for (var i = 0; i < 18; i++) {
buffer[i] = data[i + 1];
}
unpackSamples(buffer);
for (var p = 1; p <= 4; p++) {
var packet = "";
packet = `${UDP_DATA},200,`;
packet += (packetCounter - (4-p));
packet += ",";
packet += REDvalues[p-1];
packet += ",";
packet += IRvalues[p-1];
packet += `${UDP_STOP}`;
if(udpOpen){
var outBuff = new Buffer(packet);
udpTx.send(outBuff,0,outBuff.length, udpTxPort);
}
// console.log(packet);
}
break;
default:
if(parseInt(data[0]) - packetCounter != 4){ // check for dropped packet
lastDroppedPacket = parseInt(data[0]);
//var retryString = "&"+dropped;
//var reset = Buffer.from(retryString);
//_sendCharacteristic.write(reset);
droppedPacketCounter++;
console.error("\t>>>PACKET DROP<<< " + packetCounter + " " + lastDroppedPacket + " " + droppedPacketCounter);
}else{
// goodPacket++;
// console.log(goodPacket)
}
if(packetIndex === 100){
tempInteger = data[19];
}
if(packetIndex === 104){
tempFraction = data[19];
dieTemp = tempInteger;
dieTemp += (tempFraction/16);
tempAvailable = true;
console.log(dieTemp);
}
var buffer = new Buffer(18);
for (var i = 0; i < 18; i++) {
buffer[i] = data[i + 1];
}
unpackSamples(buffer);
packetCounter = parseInt(data[0]);
for (var p = 1; p <= 4; p++) {
var packet = "";
packet = `${UDP_DATA},200,`;
packet += (packetCounter - (4-p));
packet += ",";
packet += REDvalues[p-1];
packet += ",";
packet += IRvalues[p-1];
if(tempAvailable){
packet += ","; packet += dieTemp;
tempAvailable = false;
}
packet += `${UDP_STOP}`;
if(udpOpen){
var outBuff = new Buffer(packet);
udpTx.send(outBuff,0,outBuff.length, udpTxPort);
}
// console.log(packet);
}
}
//console.log(data.toString());
}
//do something when app is closing
process.on('exit', exitHandler.bind(null, {
cleanup: true
}));
//catches ctrl+c event
process.on('SIGINT', exitHandler.bind(null, {
exit: true
}));
//catches uncaught exceptions
process.on('uncaughtException', exitHandler.bind(null, {
exit: true
}));