bglib: A JavaScript repository from Tessel

BGLib

BGLib is a Node library for sending and receiving packets from BlueGiga BLE devices (currently supports ble112 and ble113). It is currently being developed by Technical Machine to support our Tessel BLE module.

Install

npm install bglib

Examples

Creating a packet

var bg = require('bglib');

var bglib = new bg()
bglib.getPacket(bg.api.systemHello, function(err, packet) {
  console.log(packet.getByteArray()); // Returns buf< 0, 0, 0, 1 >
}); 

// Use Packet Mode if you don't have flow control
// It adds a length byte to the front of every packet
bglib.setPacketMode(true);

bglib.getPacket(bg.api.systemHello, function(err, packet) {
  console.log(packet.getByteArray()); // Returns buf< 4, 0, 0, 0, 1 >
});

bglib.getPacket(bg.api.gapDiscover, [1, 0], function(err, response) {
  bglib.getPacket(bg.api.systemHello, function(err, packet) {
  console.log(packet); 
  /* Returns { mType: 0,
  tType: 0,
  payloadHighBits: 0,
  payloadLowBits: 0,
  cClass: 0,
  cID: 1,
  payload: <Buffer >,
  packetMode: true,
  callback: null }
  */
});

Parsing Incoming Data

var incomingBytes = new Buffer([ 128, 38, 6, 0, 189, 0, 108, 189, 40, 93, 28, 216, 1, 255, 27, 2, 1, 6, 17, 6, 186, 86, 137, 166, 250, 191, 162, 189, 1, 70, 125, 110, 56, 88, 171, 173, 5, 22, 10, 24, 7, 4]);

bglib.parseIncoming(incomingBytes, function(err, parsedPackets) {
  console.log("Parsed packets: ", parsedPackets);

  // BGLib will automatically parse each packet into the values stated by the datasheet
  // depending on what type of event/response it is. Below is an example for the discovered
  // peripheral event that was passed in:
  console.log(parsedPackets[0].response.packet_type) // 0
  console.log(parsedPackets[0].response.sender) //  buf< 108, 189, 40, 93, 28, 216>
  console.log(parsedPackets[0].response.address_type) // 1
  console.log(parsedPackets[0].response.bond) // 255
  console.log(parsedPackets[0].response.data) //  data object with flag types, raw data, etc
  console.log(parsedPackets[0].rssi) // -67
});

The library will hold the current state of the packets so you can pass in pieces of a packet and it will return the entire parsed packet when it has all been passed in.

Thanks