蓝牙设备配置 HCI

启动蓝牙设备

检查RFkill列表，蓝牙hci设备是否被Block

rfkill list

$     rfkill list
0: bt_default: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
2: brcmfmac-wifi: Wireless LAN
	Soft blocked: no
	Hard blocked: no
3: hci0: Bluetooth
	Soft blocked: yes
	Hard blocked: no

若blocked yes则

rfkill unblock 3

若需要恢复关闭状态节约电源，使用block命令即可

蓝牙设备属性配置

sudo hciconfig hci0 piscan
sudo hciconfig hci0 iscan

若有需要可以进入bluetoothctl管理，使用discoverable on、pairable on来开启蓝牙

蓝牙服务端配置

以L2CAP协议传输数据为例

import bluetooth

def l2cap_server():
    server_sock = bluetooth.BluetoothSocket(bluetooth.L2CAP)
    psm = 0x1001  # L2CAP PSM（Protocol/Service Multiplexer）
    server_sock.bind(("", psm))
    server_sock.listen(1)

    print(f"Waiting for connection on L2CAP PSM {psm}")

    client_sock, client_info = server_sock.accept()
    print(f"Accepted connection from {client_info}")

    try:
        while True:
            data = client_sock.recv(1024)
            if not data:
                break
            print(f"Received: {data.decode('utf-8')}")
    except IOError:
        pass
    finally:
        client_sock.close()
        server_sock.close()

if __name__ == "__main__":
    l2cap_server()

客户端在配对后连接

import bluetooth

def l2cap_client():
    server_address = "XX:XX:XX:XX:XX:XX"  # 替换为服务器的蓝牙地址
    psm = 0x1001  # L2CAP PSM（Protocol/Service Multiplexer）

    sock = bluetooth.BluetoothSocket(bluetooth.L2CAP)
    sock.connect((server_address, psm))

    try:
        while True:
            data = input("Enter message to send: ")
            sock.send(data.encode('utf-8'))
    except KeyboardInterrupt:
        pass
    finally:
        sock.close()

if __name__ == "__main__":
    l2cap_client()

即可正常传输数据