Hi all, I am looking into contributing to enhance the Bluetooth stack on Nuttx. I have begun testing the BLE stack in order to familiarize myself with it. For that, I am using the ESP32-DevKitC development board with the esp32-devkitc configuration loaded.
The problem I encountered is that the advertising of packets is broken (at least on ESP32). I am unable to detect any advertising packets being sent, thus I am unable to pair the device running Nuttx with any other device. I tried to investigate the issue by printing byte by byte the HCI packets sent by the host to the controller and the responses received, hoping to maybe discover some fault in the initialization of the controller or in the enabling of the advertising process. From the logs, it seems that everything is fine; for each command that is sent, there is a response with a 'success' return code. In theory, this means that advertising should work, but in my case, it does not. I also tried different values for the advertising parameters, but to no avail. I am using my smartphone as a way to sniff the advertising packets from the BLE stack and I found the following: on some occasions, in around 1 out of 10 system boots, right after the BLE stack is initialized and advertising enabled by default, I receive only one advertising packet. After that, advertising seems to stop because I am not seeing other advertising packets being sent after that. Apart from that, in the majority of system boots, no advertising packets are seen at all. Firstly, I would like to know if this issue has been encountered with other development boards as well. Does advertising work with other boards or is it just an esp32 related issue? This might help to narrow down the problem. Secondly, I would like to know if anyone has successfully tested BLE on the ESP32 in the past (with a different version of NuttX) and encountered no issues. Do you think it is a driver issue, a linker issue, or something else further up in the stack? I am looking forward to hearing from you and would appreciate any assistance in resolving this issue. Best regards, Robert
