Should we check the BLE connection when we call esp_ble_gattc_read_char?

[kxJiang]

hi,
if the ble connection between ESP32 and a device is suddenly broken, when we are periodically calling

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esp_ble_gattc_read_char

ESP32 will run crash. Is there any safe manner to call

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esp_ble_gattc_read_char

something like that:

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if (ble_connection_is_ok())
{
	esp_ble_gattc_read_char();
}

thanks!

[kolban]

Howdy,
The call to esp_ble_gattc_read_char() should not crash the ESP32. I think that's the symptom we should be looking at. When this call is made, we should eventually receive an ESP_GATTC_READ_CHAR_EVT event. This contains a field called "status" that should inform us of the success (or otherwise) of the call. What I would suggest is to investigate the nature of the crash itself. If as you say, the ESP32 crashes, then we are going to want to create a Github issue for tracking and resolution.

[kxJiang]

Hi,kolban. Thanks for your reply! Your are right. When we call esp_ble_gattc_read_char() in such situations that is when the BLE connection is broken, I got the ESP_GATT_ERROR from the "status" field under ESP_GATTC_READ_CHAR_EVT event. I haven't process this error, that caused ESP32 failed since I still tried to do something with the BLE things. Thanks again！ I also very appreciate your excellent workings on ESP. I have read your book long before, it's very informative. Sometimes I wonder how can you be such productive and always being enthusiastic. Any personal experiences shared on embedded system would be nice