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central.js
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central.js
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'use strict';
const api = require('pc-ble-driver-js');
const path = require('path');
const prompt = require('prompt-sync')({ sigint: true });
const adapterFactory = api.AdapterFactory.getInstance(undefined, {
enablePolling: false,
});
const BLE_DEVICE_NAME = 'Nordic_UART';
const BLE_UUID_NUS_SERVICE = '6E400001B5A3F393E0A9E50E24DCCA9E'; // NUS Service
const LBS_UUID_NUS_TX_CHAR = '6E400003B5A3F393E0A9E50E24DCCA9E'; // NUS TX
const LBS_UUID_NUS_RX_CHAR = '6E400002B5A3F393E0A9E50E24DCCA9E'; // NUS RX
const BLE_UUID_CCCD = '2902';
const notificationsEnabled = [1, 0]; // Start with notifications enabled
const connectionsPararms = {
min_conn_interval: 7.5,
max_conn_interval: 300,
slave_latency: 0,
conn_sup_timeout: 4000,
};
function discoverNusService(adapter, device) {
return new Promise((resolve, reject) => {
adapter.getServices(device.instanceId, (err, services) => {
if (err) {
reject(Error(`Error discovering the NUS service: ${err}.`));
return;
}
for (const service in services) {
if (services[service].uuid === BLE_UUID_NUS_SERVICE) {
resolve(services[service]);
return;
}
}
reject(Error("Did not discover the NUS service in peripheral's GATT attribute table."));
});
});
}
function discoverTxCharacteristic(adapter, NusService) {
return new Promise((resolve, reject) => {
adapter.getCharacteristics(NusService.instanceId, (err, characteristics) => {
if (err) {
reject(Error(`Error discovering the NUS service's characteristics: ${JSON.stringify(err)}.`));
return;
}
for (const characteristic in characteristics) {
if (characteristics[characteristic].uuid === LBS_UUID_NUS_TX_CHAR) {
resolve(characteristics[characteristic]);
return;
}
}
reject(Error("Did not discover the NUS TX char in peripheral's GATT attribute table."));
});
});
}
function discoverTxCharCCCD(adapter, NusTxCharacteristic) {
return new Promise((resolve, reject) => {
adapter.getDescriptors(NusTxCharacteristic.instanceId, (err, descriptors) => {
if (err) {
reject(Error(`Error discovering the NUS characteristic's CCCD: ${JSON.stringify(err)}.`));
return;
}
for (const descriptor in descriptors) {
if (descriptors[descriptor].uuid === BLE_UUID_CCCD) {
resolve(descriptors[descriptor]);
return;
}
}
reject(Error("Did not discover the NUS chars CCCD in peripheral's GATT attribute table."));
});
});
}
function addUserPrompt(adapter, cccdDescriptor) {
console.log('Type `s` or `S` to toggle notifications on the TX characteristic.');
console.log('Type `q` or `Q` to disconnect from the BLE peripheral and quit application.');
while (true) {
const input = prompt('Enter command:').toLocaleLowerCase();
if (input === 'q') {
adapter.close((err) => {
if (err) {
console.log(`Error closing the adapter: ${err}.`);
}
console.log('Exiting the application...');
process.exit(1);
});
} else if (input === 's') {
if (notificationsEnabled[0]) {
notificationsEnabled[0] = 0;
console.log('Disabling notifications on the NUS TX characteristic.');
} else {
notificationsEnabled[0] = 1;
console.log('Enabling notifications on the NUS TX characteristic.');
}
adapter.writeDescriptorValue(cccdDescriptor.instanceId, notificationsEnabled, false, (err) => {
if (err) {
console.log(`Error enabling notifications on the NUS TX characteristic: ${err}.`);
process.exit(1);
}
console.log('Notifications toggled on the NUS TX characteristic.');
});
}
}
}
function addUserInputListener(adapter, cccdDescriptor) {
console.log('Press any key to toggle notifications on the TX characteristic.');
console.log('Press `q` or `Q` to disconnect from the BLE peripheral and quit application.');
process.stdin.setEncoding('utf8');
process.stdin.setRawMode(true);
process.stdin.on('readable', () => {
const chunk = process.stdin.read();
if (chunk === null) return;
if (chunk[0] === 'q' || chunk[0] === 'Q') {
adapter.close((err) => {
if (err) {
console.log(`Error closing the adapter: ${err}.`);
}
console.log('Exiting the application...');
process.exit(1);
});
} else {
if (notificationsEnabled[0]) {
notificationsEnabled[0] = 0;
console.log('Disabling notifications on the NUS TX characteristic.');
} else {
notificationsEnabled[0] = 1;
console.log('Enabling notifications on the NUS TX characteristic.');
}
adapter.writeDescriptorValue(cccdDescriptor.instanceId, notificationsEnabled, false, (err) => {
if (err) {
console.log(`Error enabling notifications on the NUS TX characteristic: ${err}.`);
process.exit(1);
}
console.log('Notifications toggled on the NUS TX characteristic.');
});
}
});
}
function connect(adapter, connectToAddress) {
return new Promise((resolve, reject) => {
console.log(`Connecting to device ${connectToAddress}...`);
const options = {
scanParams: {
active: false,
interval: 100,
window: 50,
timeout: 0,
},
connParams: connectionsPararms,
};
adapter.connect(connectToAddress, options, (err) => {
if (err) {
reject(Error(`Error connecting to target device: ${err}.`));
return;
}
console.time('connectionTime');
resolve();
});
});
}
function startScan(adapter) {
return new Promise((resolve, reject) => {
console.log('Started scanning...');
const scanParameters = {
active: true,
interval: 100,
window: 50,
timeout: 0,
};
adapter.startScan(scanParameters, (err) => {
if (err) {
reject(new Error(`Error starting scanning: ${err}.`));
} else {
resolve();
}
});
});
}
function handleConnectedDevice(adapter, device) {
discoverNusService(adapter, device)
.then((service) => {
console.log('Discovered the NUS service.');
return discoverTxCharacteristic(adapter, service)
.then((characteristic) => {
console.log('Discovered the NUS TX characteristic.');
return discoverTxCharCCCD(adapter, characteristic);
})
.then((descriptor) => {
console.log("Discovered the NUS TX characteristic's CCCD.");
console.log('Enabling notifications on the NUS TX characteristic.');
adapter.writeDescriptorValue(descriptor.instanceId, notificationsEnabled, false, (err) => {
if (err) {
console.log(`Error enabling notifications on the NUS TX characteristic: ${err}.`);
process.exit(1);
}
console.log('Notifications toggled on the NUS TX characteristic.');
});
// INFO: Not used right now, notifications are enabled by default
// addUserInputListener(adapter, descriptor);
// addUserPrompt(adapter, descriptor);
});
})
.catch((error) => {
console.log(error);
process.exit(1);
});
}
function addAdapterListener(adapter) {
adapter.on('logMessage', (severity, message) => {
if (severity > 3) console.log(`LOG ${severity} ${message}`);
});
adapter.on('error', (error) => {
console.log(`error: ${JSON.stringify(error, null, 1)}.`);
});
adapter.on('deviceConnected', (device) => {
console.log(`Device ${device.address}/${device.addressType} connected.`);
});
adapter.on('deviceDisconnected', (device) => {
console.log(`Device ${device.address} disconnected.`);
console.timeEnd('connectionTime');
startScan(adapter)
.then(() => {
console.log('Successfully initiated the scanning procedure.');
})
.catch((error) => {
console.log(error);
});
});
adapter.on('deviceDiscovered', (device) => {
if (device.name === BLE_DEVICE_NAME) {
console.log(`Discovered device ${device.address}/${device.addressType}.`);
connect(adapter, device.address)
.then(() => {
// no need to do anything here
})
.catch((error) => {
console.log(error);
process.exit(1);
});
}
});
adapter.on('scanTimedOut', () => {
console.log('scanTimedOut: Scanning timed-out. Exiting.');
process.exit(1);
});
adapter.on('characteristicValueChanged', (attribute) => {
switch (attribute.uuid) {
case LBS_UUID_NUS_TX_CHAR:
console.log(`NUS RX: ${attribute.uuid} ${String.fromCharCode(...attribute.value)}`);
break;
default:
console.log(`Received Data: ${attribute.uuid} ${attribute.value}`);
}
});
adapter.on('connParamUpdateRequest', (device, connectionParameters) => {
console.log(`connParamUpdateRequest: ${JSON.stringify(connectionParameters)}.`);
adapter.updateConnectionParameters(device.instanceId, connectionParameters, (err) => {
if (err) {
console.log(`updateConnectionParameters Failed: ${err.message}.`);
return;
}
handleConnectedDevice(adapter, device);
});
});
adapter.on('connParamUpdate', (device, connectionParameters) => {
console.log(`connParamUpdate: ${JSON.stringify(connectionParameters)}.`);
});
adapter.on('dataLengthChanged', (remoteDevice, maxTxOctets) => {
console.log(`dataLengthChanged: ${maxTxOctets}.`);
});
adapter.on('dataLengthUpdated', (remoteDevice, event) => {
console.log(`dataLengthUpdated: ${JSON.stringify(event.effective_params)}.`);
});
adapter.on('attMtuRequest', (device, newMtu) => {
console.log(`attMtuRequest: ${newMtu}.`);
adapter.attMtuReply(device.instanceId, newMtu, (err, mtu) => {});
});
adapter.on('dataLengthUpdateRequest', (device, newOctets) => {
console.log(`dataLengthUpdateRequest: ${JSON.stringify(newOctets)}.`);
adapter.dataLengthUpdate(device.instanceId, newOctets, () => {});
});
}
function openAdapter(adapter) {
return new Promise((resolve, reject) => {
const baudRate = 1000000;
console.log(`Opening adapter with ID: ${adapter.instanceId} and baud rate: ${baudRate}...`);
adapter.open({ baudRate, logLevel: 'debug' }, (err) => {
if (err) {
reject(Error(`Error opening adapter: ${err}.`));
}
resolve();
});
});
}
function help() {
console.log(`Usage: ${path.basename(__filename)} <PORT> <SD_API_VERSION>`);
console.log();
console.log('PORT is the UART for the adapter. For example /dev/ttyS0 on Unix based systems or COM1 on Windows based systems.');
console.log('SD_API_VERSION can be v2 or v5. nRF51 series uses v2.');
console.log();
console.log('It is assumed that the nRF device has been programmed with the correct connectivity firmware.');
}
if (process.argv.length !== 4) {
help();
process.exit(-1);
} else {
const [, , port, apiVersion] = process.argv;
if (port == null) {
console.error('PORT must be specified');
process.exit(-1);
}
if (apiVersion == null) {
console.error('SD_API_VERSION must be provided');
process.exit(-1);
} else if (!['v2', 'v5'].includes(apiVersion)) {
console.error(`SD_API_VERSION must be v2 or v5, argument provided is ${apiVersion}`);
process.exit(-1);
}
const adapter = adapterFactory.createAdapter(apiVersion, port, 'pc-ble');
addAdapterListener(adapter);
openAdapter(adapter)
.then(() => {
console.log('Opened adapter.');
return startScan(adapter);
})
.then(() => {
console.log('Scanning.');
})
.catch((error) => {
console.log(error);
process.exit(-1);
});
}