Communicate with Android bluetooth device via NodeJS and Termux

You can communicate through the serial port using this tool. I have never use this tool but providing this only as a reference, since android is built on a linux kernel this might work. Please note that the examples are same as documentation.

https://github.com/eelcocramer/node-bluetooth-serial-port

Basic client usage

var btSerial = new (require('bluetooth-serial-port')).BluetoothSerialPort();btSerial.on('found', function(address, name) {    btSerial.findSerialPortChannel(address, function(channel) {        btSerial.connect(address, channel, function() {            console.log('connected');            btSerial.write(new Buffer('my data', 'utf-8'), function(err, bytesWritten) {                if (err) console.log(err);            });            btSerial.on('data', function(buffer) {                console.log(buffer.toString('utf-8'));            });        }, function () {            console.log('cannot connect');        });        // close the connection when you're ready        btSerial.close();    }, function() {        console.log('found nothing');    });});btSerial.inquire();

Basic server usage (only on Linux)

var server = new(require('bluetooth-serial-port')).BluetoothSerialPortServer();var CHANNEL = 10; // My service channel. Defaults to 1 if omitted.var UUID = '38e851bc-7144-44b4-9cd8-80549c6f2912'; // My own service UUID. Defaults to '1101' if omittedserver.listen(function (clientAddress) {    console.log('Client: ' + clientAddress + ' connected!');    server.on('data', function(buffer) {        console.log('Received data from client: ' + buffer);        // ...        console.log('Sending data to the client');        server.write(new Buffer('...'), function (err, bytesWritten) {            if (err) {                console.log('Error!');            } else {                console.log('Send ' + bytesWritten + ' to the client!');            }        });    });}, function(error){    console.error("Something wrong happened!:" + error);}, {uuid: UUID, channel: CHANNEL} );