Payload raw data in hex

[Vrielmann-EE]

I would like to send raw hex values over the payload, to keep the amount of data very small. But if I send a value greater or equal than 0x80 - I am not recieving the value 0x80. In this case I am receiving "c2 80".

Thanks in advance

[robertsLando]

@Vrielmann-EE
Could you show me how you are sending it? Could you paste here a snippet that reproduces the issue?

[Vrielmann-EE]

I did - it works as expected. With this small test client on connecting to the same server, I am sending and receiving 128 (0x80), on the right side: Raw payload: 128:

const mqtt = require('mqtt')
const client  = mqtt.connect('mqtt://localhost')

client.on('connect', function () {
    client.subscribe('K2/ULN', function (err) {
        if (!err) {
            const buffer = new Uint8Array(1);
            buffer[0] = 0x80;
            client.publish('K2/ULN', buffer);
        }
    });
})

client.on('message', function (topic, message) {
    console.log(message);
    client.end();
})

My first test client, from which I had sent, is the MQTTbox: https://chrome.google.com/webstore/detail/mqttbox/kaajoficamnjijhkeomgfljpicifbkaf

[robertsLando]

@Vrielmann-EE Ok so it's not an aedes bug, it's a bug with MQTT Box I think

[Vrielmann-EE]

Ok, I think so too! MQTTbox is the only client I know where I can change the "payload type" - Would be grateful for any other hint. How can I mark this question as answered?

[robertsLando]

I did it now

[robertsLando]

I usually use mqtt explorer as mqtt client