树莓派 pybluez 蓝牙通信

前言

这两天在搞树莓派蓝牙通信，发现里面的坑还真不少，在次记录一下，以备查询

安装 pybluez

我用的python3，现在差不多没人用Python2了吧…
首先需要安装 libbluetooth-dev

 sudo apt-get install libbluetooth-dev

然后安装 pybluez

 sudo pip3 install pybluez

使用

可以先看看官方的示例程序 点我跳转

我使用了 rfcomm-server.py 这个程序，遇到以下错误

1. no such file or directory
解决办法：修改文件

sudo nano /lib/systemd/system/bluetooth.service

找到如下一行

ExecStart=/usr/lib/bluetooth/bluetoothd

在末尾添加 -E -C

ExecStart=/usr/lib/bluetooth/bluetoothd -E -C

如果没有这一行，需要自行添加,写在上面那条语句下面即可

ExecStartPost=/usr/bin/sdptool add SP

Ctrl+o 保存 Ctrl+x 退出

2. no advertisable device
这是由于蓝牙不可见导致
解决办法:在原程序上增加两句，使蓝牙可发现

#!/usr/bin/env python3
"""PyBluez simple example rfcomm-server.py
Simple demonstration of a server application that uses RFCOMM sockets.
Author: Albert Huang 
$Id: rfcomm-server.py 518 2007-08-10 07:20:07Z albert $
"""

import bluetooth
import os
import sys

#增加以下两句 修改蓝牙可见
os.system("bluetoothctl power on")
os.system("bluetoothctl discoverable on")


server_sock = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
server_sock.bind(("", bluetooth.PORT_ANY))
server_sock.listen(1)

port = server_sock.getsockname()[1]

uuid = "94f39d29-7d6d-437d-973b-fba39e49d4ee"

bluetooth.advertise_service(server_sock, "SampleServer", service_id=uuid,
                            service_classes=[uuid, bluetooth.SERIAL_PORT_CLASS],
                            profiles=[bluetooth.SERIAL_PORT_PROFILE],
                            # protocols=[bluetooth.OBEX_UUID]
                            )

print("Waiting for connection on RFCOMM channel", port)

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

try:
    while True:
        data = client_sock.recv(1024)
        if not data:
            break
        print("Received", data)
except OSError:
    pass

print("Disconnected.")

client_sock.close()
server_sock.close()
print("All done.")

3.Permission denied
解决办法：修改文件权限

sudo chmod 777 /var/run/sdp

参考链接

1. https://bbs.archlinux.org/viewtopic.php?id=201672
2. https://blog.csdn.net/qq21497936/article/details/110940484