search

nkolban / esp32-snippets

Sample ESP32 snippets and code fragments
https://leanpub.com/kolban-ESP32
Apache License 2.0
2.37k stars 710 forks source link

BLE Client: getCharacteristics doesn't get any values #911

Open skye0402 opened 5 years ago

skye0402 commented 5 years ago

Dear experts,

I try to connect to a Decawave Module which uses a Nordic BLE Chip nRF52832. I can connect successfully with the Android nRF app. Now the client app that I use only gets to the point saying:

ESP32 BLE Server program Scan Result: Name: , Address: 38:a0:d6:a3:ca:c5, manufacturer data: 06000109210a63c058508cf454594f4e353635373930343941 Scan Result: Name: , Address: c7:69:d1:f4:79:4e Found Device :-)... connecting to Server as client

  • Created client
  • Connected to fitnessband
  • Found our service ****LED turned ON****

However, it doesn't connect to the characteristic and so I tried to read all available characteristics (nRF shows many, maybe 20). But it seems this variable is null.

Any expert here that can check if I made a coding mistake? I try now since days to connect and can't manage. I see that the blue LED of the server goes on which means BLE is being connected to, but then goes off again.

Thank you for your help!

chegewara commented 5 years ago

There is additional parameter in connect() function. Try to use BLE_ADDR_TYPE_RANDOM. https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/BLEClient.h#L37

skye0402 commented 5 years ago

Thank you very much for that hint. pClient->connect(pAddress, BLE_ADDR_TYPE_RANDOM);

Is this how you meant it? Now the program stops after output of line

ESP32 BLE Server program Scan Result: Name: , Address: 25:7e:20:f9:bf:92, manufacturer data: 06000109210a63c058508cf454594f4e353635373930343941 Scan Result: Name: , Address: c7:69:d1:f4:79:4e Found Device :-)... connecting to Server as client

  • Created client

And it doesn't move further. Maybe crashed? I'm wondering what ways to I have to debug it.