Is there a way to find out the security level set on a specific BLE connection? I can configure the level from my side, using BLE stack, including passkey, MITM protection, etc., but can I find out information about what level of protection was set specifically for this device with which the connection was established?

建立连接使用到的加密一般是配对绑定。

需要数据传输用到加密，可以使用AES128加解密。