@bencevans/ve.direct/test.js

Victron VE.Direct Parser

const test = require("tape");
const SerialPort = require("serialport");
const VEDirectParser = require("./parser");

const validMessage = Buffer.from([
    0x0d, 0x0a, 0x50, 0x49, 0x44, 0x09, 0x30, 0x78, 0x32, 0x30, 0x33, 0x0d, 0x0a, 0x56, 0x09, 0x32, //  |..PID.0x203..V.2|
    0x36, 0x32, 0x30, 0x31, 0x0d, 0x0a, 0x49, 0x09, 0x30, 0x0d, 0x0a, 0x50, 0x09, 0x30, 0x0d, 0x0a, //  |6201..I.0..P.0..|
    0x43, 0x45, 0x09, 0x30, 0x0d, 0x0a, 0x53, 0x4f, 0x43, 0x09, 0x31, 0x30, 0x30, 0x30, 0x0d, 0x0a, //  |CE.0..SOC.1000..|
    0x54, 0x54, 0x47, 0x09, 0x2d, 0x31, 0x0d, 0x0a, 0x41, 0x6c, 0x61, 0x72, 0x6d, 0x09, 0x4f, 0x46, //  |TTG.-1..Alarm.OF|
    0x46, 0x0d, 0x0a, 0x52, 0x65, 0x6c, 0x61, 0x79, 0x09, 0x4f, 0x46, 0x46, 0x0d, 0x0a, 0x41, 0x52, //  |F..Relay.OFF..AR|
    0x09, 0x30, 0x0d, 0x0a, 0x42, 0x4d, 0x56, 0x09, 0x37, 0x30, 0x30, 0x0d, 0x0a, 0x46, 0x57, 0x09, //  |.0..BMV.700..FW.|
    0x30, 0x33, 0x30, 0x37, 0x0d, 0x0a, 0x43, 0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x09, 0xd8, //  |0307..Checksum..|
    // From https://www.victronenergy.com/live/vedirect_protocol:faq
])

test('parser.checksum', t => {
    t.plan(2)
    t.equal(VEDirectParser.checksum(validMessage), 0)
    t.notEqual(VEDirectParser.checksum(Buffer.from([0x34, 0x54])), 0)
})

test("parser", (t) => {
    const rl = new SerialPort.parsers.Delimiter({
        delimiter: Buffer.from([0x0d, 0x0a], 'hex'),
        includeDelimiter: false
    })

    const parser = new VEDirectParser()

    parser.on('data', data => {
        console.log(data)
        t.equal(data['Alarm'], 'OFF')
        t.equal(data['Relay'], 'OFF')
        t.end()
    })

    rl.pipe(parser)
    rl.write(validMessage)
    rl.write(Buffer.from([0x0d, 0x0a]))
});