How can i use mqtt in lvgl

How to
1

I’m using:

SquareLine Studio 1.0.4

##Esp32 DevKitV1

Hello
I’m having some difficulty
In my project, I would like to combine the use of the PubSubClient(mqtt) library and LVGL(SquareLine)
I would like to find out:

  1. how can I effectively and without bugs combine their work
  2. how can I change the state of the button, like a switch, that is, On Off, through mqtt
    3)how can i change Arc state via mqtt

Many thanks in advance

2

Hi,

MQTT exists “next to” LVGL so they shouldn’t cause bugs in each other.

To react on an MQTT message in LVGL, just call lv_arc_set_value() or similar function when you get a message.

Note that LVGL is not thread safe so please read this section of LVGL’s docs:
https://docs.lvgl.io/master/porting/os.html

3

Thanks for the answer. I would like to know how I can use mqtt in ui_events.c file. That is, I want to get: when the button is clicked, send the value to mqtt.

“my device is esp32, i program in arduino ide”

4

Could you already use MQTT without SquareLine or LVGL?

5

hi. I also want to use WiFi.h library in ui_envents but it gives me this error. please help me

image
image1920×1080 244 KB

6

i solved it by changing ui_events.c to ui_events.cpp. Thank for all