Hi all, This bug have been fixed, refer to https://github.com/espressif/esp-idf/co ... 9fa387a766

Hi nisarg_sls,
I'm sorry to tell you that there are some problems about the parameter Security Options.
As the capability of your BT SPP Acceptor is No Input No Output, it will pair to others by just-work(NO MITM protection). Bluetooth Security Mode is mode 4 level 2.

Hi all， There is one thing that needs attention here. We can't call esp_spp_write() multiple times in succession. We should wait for ESP_SPP_WRITE_EVT, then call esp_spp_write() again. So, when do you call esp_spp_write()？If you call it multiple times in succession, please change it and test again. ...

Hi all,
This is a misspelling in description, actually it is：
```
Connect to remote bluetooth HFP audio gateway(AG) device, must after esp_hf_client_init().
```

Hi zdoucha,
We can send any message by SPP(Serial Port Profile), or send an audio stream by HFP(Hands-free Profile).

Hi zdoucha, esp32 could discover all nearby smartphones(android & ios, bluetooth should be activated on them and discoverable), it also could pair and connect to smartphones. Smartphones send file with OBject EXchange protocol, we do not support it, now. But we can send message to smartphones by oth...

Hi sharky,
If a classic BT device want to discover others, it will sent a inquiry. Then the device which is in inquiry scan mode will response it. So, if a device is no-discoverable (not in inquiry scan), will not find by others.