Byte.

Thank you chegewara, I am not able to make this work. Using an android app or any other utility, I can send the four bytes to the GoPro and it works, but definitely cannot do it using an ESP32 program. I'll explore other options, raspberry and such. There is a few python samples to do this. Thank yo...

Thank you very much chegewara, I understand. Please see this screenshot from log of the BLE Tool app, right after a successful BLE command request to a GoPro cam. SmartSelect_20200714-101342_BLE Tool.jpg The app lets you introduce the data to send in hex. In this case just "03010101". As you see, th...

Thank you cheguewara,
the code you suggest produces the same effect. The characteristic value field is filled with those 259,000 and 257,000 that I cannot tell where they come from.
See the log in the BLE Tool app:

Hi, I am using an ESP32 and Arduino IDE to build a camera controller for a GoPro Hero 8. I have got it with no problem using WiFi, but BLE is supposed to drain the battery much less and, I hope, improve the performance. The problem with BLE and ESP32 is I haven't been able to send a command successf...