ESP32 wroom32: BluetoothSerial.write doesn't work anymore at client reconnection

[Alteregoxxx]

Hello everyone,
this is my first topic, looking for your help

As for the subject, using the ESP32 Wroom32 BluetoothSerial, if it's sending fast lots of a data using BluetoothSerial.write() method and the client to which it was connected disconnects, at the client reconnection, ESP32 Wroom32 accept the connection (I'm sure because I can see it from the serial prints I perform in the callback called at client connection/disconnection) , but the BluetoothSerial.write() method doesn't send data anymore.

A snippet worths a thousand words:

Code: [Select all] [Expand/Collapse]

1.  
2. #include <Arduino.h>
3. #include <BluetoothSerial.h>
4. BluetoothSerial MyBT;
5. bool connesso = 0;
6. /* I use some other variables here
7. ...
8. ...
9. */
10.  
11. void callback(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
12. {
13.   if (event == ESP_SPP_SRV_OPEN_EVT)
14.   {
15.     Serial.println("Client Connected");
16.     connesso = true;
17.   }
18.  
19.   if (event == ESP_SPP_CLOSE_EVT)
20.   {
21.     Serial.println("Client disconnected");
22.     connesso = false;
23.   }
24. }
25.  
26. /* I implement some other functions here
27. .....
28. .....
29. */
30.  
31. void setup()
32. {
33.  
34.   Serial.begin(9600);
35.   MyBT.register_callback(callback);
36.  
37.   MyBT.begin("ESP32-BT");
38.   while (!MyBT.hasClient())
39.   {
40.     delay(1000);
41.     Serial.println("ESP32 is ready to pair.");
42.   }
43.   Serial.println("ESP32 PAIRED!!");
44.   delay(1000);
45. }
46.  
47. void loop()
48. {
49.  
50. /* I initialize here all the variables that I'll send using BluetoothSerial.write()
51. .....
52. .....
53. */
54.  
55.   if (connesso)
56.   {
57.  
58. /*I perform some other tasks on the aforementioned variables here
59. .......
60. .......
61. .......
62. */
63.  
64.     MyBT.write(AddParityAndPosition(&MyUint8_t_here, true));
65.     MyBT.write(AddParityAndPosition(&AnotherUint8_t_here, false));
66.     /*If I insert some delay in the order of hundreds of milliseconds, as in the subsequent line of code, the issue disappear*/
67.     //delay(100);  
68.  
69.   }
70.  
71.   else{
72.     Serial.println("Waiting for a client connection");
73.     delay(500);
74.   }
75.  
76. }

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Is this a normal behaviour? Can someone be so kind in trying to reproduce the issue?

Any help/explanation on the issue is very welcome!

Thanks!

[Alteregoxxx]

Has anyone managed to replicate the issue?

[Darshan Panchal]

Hi,

Facing the same issue on my esp32 on bleutooth serial example.

If any one find any solution, please post.

Regards.