Try connecting to a simple module

[naokiiwakami]

Module description is such as follows. This module is simple enough to build on a breadboard.

{
    "node_type": "Module",
    "model_name": "a3.poc",
    "model_id": 3,
    "component_number": 0,
    "channel": "can",
    "child_nodes": [{
        "node_type": "Knob",
        "node_name": "LED",
        "component_number": 1,
        "max_value": 255
    }, {
        "node_type": "Switch",
        "node_name": "Color",
        "component_number": 2,
        "options": [ "red", "green", "blue" ],
        "initial_value": 0
    }]
}

[naokiiwakami]

Instance descriptor:

instance_descriptor = {
    model_id: 3,
    instance_id: 0,
    components: [
        0, // module value, usually meaningless
        128,
        1
    ]
};

[naokiiwakami]

struct instance_descriptor {
  uint16_t model_id;
  uint16_t instance_id;
  uint16_t components[];
};