CODEWITHSUNDEEP
androidpublish-subscribemqttpaho
Ramin
Ramin

Reputation: 484

publishing and recieving bigger messages using MQTT

I'm trying to test out my android application which uses MQTT to receive messages. I receive the message as JSON which also contains a base64 encoded image. this works perfectly fine when the image is a few kilobytes , but when I try to send anything around 400KB the messages doesn't get sent.

I've used two public brokers both times got the same response. (test.mosquitto.org & iot.eclipse.org)

here's the JSON object being sent:

public void send() {
JSONObject obj = new JSONObject();
try {
    obj.put("isFormat", Boolean.valueOf(true));
    obj.put("title", "this is a title");
    obj.put("image", "(insert base64 encoded image here)");
    obj.put("imageExtension", "png");
    obj.put("body", "<p>body</p>");
} catch (JSONException e) {
}

here's the code used to publish , using Paho android service client:

client.publish(topic,obj.toString().getBytes(),Constants.QoS_ACK,false,null,null);

Upvotes: 0

Views: 776

Answers (1)

kamils
kamils

Reputation: 1

I think MQTT might not be comfortable with you sending the image within the JSON and you also doing a toString() which I doubt will help to encode back the image. try sending the image seperately and then bundle it with the json at reception. This should work!

Upvotes: 0

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