BlueTooth Classic Slow reading

MIT App Inventor Help
1

Hi to all friends
i made a small app to read via bluetooth the state of 6 switches
I am using an ESP32 D microcontroller to read the switches and to send via Blue Tooth
i am using FreeRTOS

The Esp32 is very fast (ESP32 = 32bit dual-core 160MHz to 240MHz CPU)

i setup the clock in my app inventor app to be 10ms

when my code (after reading the switches ) has a delay of 10ms then my app showing the results very very slow minutes away..

if now increase the delay in my code to 500ms then my app has a delay to read the data just one second
i can live with that but i am curious where is the problem for that lag in reading the data.

i used one app from play store the "Serial Bluetooth Terminal" to connect to my device and it can read the data very fast even when i have 10ms delay in my code, so the code is not the problem i think.. something i am doing wrong in the app inventor setup

Task Code :


void TaskBlueTooth(void *pvParameters) {
  int CheckSafetiesBTh[6];
  for (;;) {
    xQueueReceive(QueueHandle, &CheckSafetiesBTh, portMAX_DELAY);
    if (CheckSafetiesBTh[0] == 0) {
      SerialBT.println("t");
    } else if (CheckSafetiesBTh[0] == 1) {
      SerialBT.println("T");
    } 
    if (CheckSafetiesBTh[1] == 0) {
      SerialBT.println("s");
    } else if (CheckSafetiesBTh[1] == 1) {
      SerialBT.println("S");
    }  
    if (CheckSafetiesBTh[2] == 0) {
      SerialBT.println("d");
    } else if (CheckSafetiesBTh[2] == 1) {
      SerialBT.println("D");
    }    
    if (CheckSafetiesBTh[3] == 0) {
      SerialBT.println("l");
    } else if (CheckSafetiesBTh[3] == 1) {
      SerialBT.println("L");
    }   
    if (CheckSafetiesBTh[4] == 0) {
      SerialBT.println("p");
    } else if (CheckSafetiesBTh[4] == 1) {
      SerialBT.println("P");
    }    
    if (CheckSafetiesBTh[5] == 0) {
      SerialBT.println("e");
    } else if (CheckSafetiesBTh[5] == 1) {
      SerialBT.println("E");
    }
    vTaskDelay(500 / portTICK_PERIOD_MS);
  }
}

MiniPreview.aia (4.4 KB)

Thanks in advance

2

Try it with 10ms delay. If it doesn't work, try increasing the delay to e.g. 30ms.

MiniPreview4.aia (4.4 KB)

3

Take into account the minimum time AI2 needs to run the clock timer.