This library allows building and parsing DASH7 ALP packets.

Methods:

parse(payload)

Parses a ALP encoded packets.

• payload : The payload to parse. Can either be a Buffer or an array containing bytes (integers between 0 and 255).
• Return value: Array of parsed ALP packets.

Example:

var alp = require("alp-lib");
var hex_payload = "41000008"; // Read 8 first bytes of file 0
var payload = new Buffer(hex_payload, "hex");
var parsed = alp.parse(payload);
console.log(parsed);

build(packets)

Encodes packets into bytes following the ALP protocol.

• packets : Array containing the informations concerning the ALP packets to build. The specification of the required informations can be found in the file alp_spec.xml included in the folder of this module.
• Return value: An array of bytes.

Example:

var alp = require ("alp-lib");
var pkt = {
    opcode      : 1,        // Read file
    resp        : true,     // We want a response
    group       : false,    // This action is not grouped with the next
    file_id     : 0,        // We want to read the file 0
    file_offset : 0,        // We want to read from the offset 0
    length      : 8,        // We want to read 8 bytes
};
var payload = alp.build([pkt]);
console.log("Array:", payload);
var buf = new Buffer(payload);
console.log("Buffer:", buf);