Help building app

Questions & Help
1

Hi all,

I have a android built in wall display with led lights, gpo ports, 2relais and temperature and humidity sensor.

I do have the API documents, but don’t know how to build an app for it.

It’s also possible to connect via MQTT.

Is there someone who could help me?

2

You can request an app here:

Do you have any knowledge about MQTT?

3

Thanks, i will repost it there. I am complete new to mqtt. Did read a lot but never really did something with that.

4

What’s the product name?

Can you share these?

5

cid=client_id

prefix=homeassistant

base=client_id

static void init_topics(const char* base)

{

// 灯光

snprintf(light_state_topic, sizeof(light_state_topic), "%s/light/status", base);

snprintf(light_command_topic, sizeof(light_command_topic), "%s/light/switch", base);

snprintf(brightness_state_topic, sizeof(brightness_state_topic), "%s/brightness/status", base);

snprintf(brightness_command_topic, sizeof(brightness_command_topic), "%s/brightness/set", base);

snprintf(rgb_state_topic, sizeof(rgb_state_topic), "%s/rgb/status", base);

snprintf(rgb_command_topic, sizeof(rgb_command_topic), "%s/rgb/set", base);

// 传感器

snprintf(temp_state_topic, sizeof(temp_state_topic), "%s/sensors/temperature", base);

snprintf(hum_state_topic, sizeof(hum_state_topic), "%s/sensors/humidity", base);

// 开关

snprintf(switch1_state_topic, sizeof(switch1_state_topic), "%s/switch1/status", base);

snprintf(switch1_command_topic, sizeof(switch1_command_topic), "%s/switch1/set", base);

snprintf(switch2_state_topic, sizeof(switch2_state_topic), "%s/switch2/status", base);

snprintf(switch2_command_topic, sizeof(switch2_command_topic), "%s/switch2/set", base);

}

// ========= ③ 统一发布 5 个实体的 Discovery =========

static void publish_ha_discovery(const char* cid, const char* prefix /*通常为"homeassistant"*/) {

char topic\[256\];

char payload\[1024\];

char dev\[256\];

make_device_json(dev, sizeof(dev), cid);

printf(“------%s------\n”,prefix);

// ------- light (支持 开关/亮度/RGB) -------

snprintf(topic, sizeof(topic), "%s/light/%s_rgb1/config", prefix, cid);

snprintf(payload, sizeof(payload),

    "{"

      "\\"name\\":\\"%s RGB\\","

      "\\"unique_id\\":\\"%s_rgb1\\","

      "\\"command_topic\\":\\"%s\\","

      "\\"state_topic\\":\\"%s\\","

      "\\"state_value_template\\":\\"{{ value_json.state }}\\","

      "\\"brightness_command_topic\\":\\"%s\\","

      "\\"brightness_state_topic\\":\\"%s\\","

      "\\"brightness_value_template\\":\\"{{ value_json.brightness }}\\","

      "\\"rgb_command_topic\\":\\"%s\\","

      "\\"rgb_state_topic\\":\\"%s\\","

      "\\"rgb_value_template\\":\\"{{ value_json.rgb\[0\] }},{{ value_json.rgb\[1\] }},{{ value_json.rgb\[2\] }}\\","

      "\\"payload_on\\":\\"ON\\","

      "\\"payload_off\\":\\"OFF\\","

      "%s"

    "}",

    cid, cid,

    light_command_topic, light_state_topic,

    brightness_command_topic, brightness_state_topic,

    rgb_command_topic, rgb_state_topic,

    dev

);

publish_config_retained(topic, payload);

// ------- switch1 -------

snprintf(topic, sizeof(topic), "%s/switch/%s_switch1/config", prefix, cid);

snprintf(payload, sizeof(payload),

    "{"

      "\\"name\\":\\"%s Switch1\\","

      "\\"unique_id\\":\\"%s_switch1\\","

      "\\"command_topic\\":\\"%s\\","

      "\\"state_topic\\":\\"%s\\","

      "\\"value_template\\":\\"{{ value_json.state }}\\","

      "\\"payload_on\\":\\"ON\\","

      "\\"payload_off\\":\\"OFF\\","

      "%s"

    "}",

    cid, cid,

    switch1_command_topic, switch1_state_topic,

    dev

);

publish_config_retained(topic, payload);

// ------- switch2 -------

snprintf(topic, sizeof(topic), "%s/switch/%s_switch2/config", prefix, cid);

snprintf(payload, sizeof(payload),

    "{"

      "\\"name\\":\\"%s Switch2\\","

      "\\"unique_id\\":\\"%s_switch2\\","

      "\\"command_topic\\":\\"%s\\","

      "\\"state_topic\\":\\"%s\\","

      "\\"value_template\\":\\"{{ value_json.state }}\\","

      "\\"payload_on\\":\\"ON\\","

      "\\"payload_off\\":\\"OFF\\","

      "%s"

    "}",

    cid, cid,

    switch2_command_topic, switch2_state_topic,

    dev

);

publish_config_retained(topic, payload);

// ------- temperature sensor -------

snprintf(topic, sizeof(topic), "%s/sensor/%s_temperature/config", prefix, cid);

snprintf(payload, sizeof(payload),

    "{"

      "\\"name\\":\\"%s Temperature\\","

      "\\"unique_id\\":\\"%s_temperature\\","

      "\\"state_topic\\":\\"%s\\","

      "\\"value_template\\":\\"{{ value_json.temperature }}\\","

      "\\"unit_of_measurement\\":\\"°C\\","

      "\\"device_class\\":\\"temperature\\","

      "\\"state_class\\":\\"measurement\\","

      "%s"

    "}",

    cid, cid,

    temp_state_topic,

    dev

);

publish_config_retained(topic, payload);

// ------- humidity sensor -------

snprintf(topic, sizeof(topic), "%s/sensor/%s_humidity/config", prefix, cid);

snprintf(payload, sizeof(payload),

    "{"

      "\\"name\\":\\"%s Humidity\\","

      "\\"unique_id\\":\\"%s_humidity\\","

      "\\"state_topic\\":\\"%s\\","

      "\\"value_template\\":\\"{{ value_json.humidity }}\\","

      "\\"unit_of_measurement\\":\\"%%\\","

      "\\"device_class\\":\\"humidity\\","

      "\\"state_class\\":\\"measurement\\","

      "%s"

    "}",

    cid, cid,

    hum_state_topic,

    dev

);

publish_config_retained(topic, payload);

}

6

The model is rk3576_u also named as smt101

7

This is al the info i have, hopes that’s enough?

8

What’s the MQTT broker domain? Maybe it’s in the environment variables? You didn’t mention the domain/base URL of this MQTT broker.

9

And how do you authenticate? Is the MQTT username the email address of your account there?

Also, what’s the name of the mobile/web app that you control it with?

10

Can we private message each other here? Maybe thats more easy

1 Like