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0031_Bluetooth_SPP.md

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Bluetooth SPP

尝试蓝牙串口功能

参考文档

steps

  • sudo apt-get install bluez pi-bluetooth python-bluez
  • cat /etc/systemd/system/dbus-org.bluez.service 
    [Unit]
Description=Bluetooth service
Documentation=man:bluetoothd(8)
ConditionPathIsDirectory=/sys/class/bluetooth

[Service]
Type=dbus
BusName=org.bluez
ExecStart=/usr/lib/bluetooth/bluetoothd -C
ExecStartPost=/usr/bin/sdptool add SP
NotifyAccess=main
#WatchdogSec=10
#Restart=on-failure
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
LimitNPROC=1
ProtectHome=true
ProtectSystem=full

[Install]
WantedBy=bluetooth.target
Alias=dbus-org.bluez.service
  • sudo reboot
  • hciconfig 
    hci0:	Type: Primary  Bus: UART
	BD Address: DC:A6:32:17:47:93  ACL MTU: 1021:8  SCO MTU: 64:1
	UP RUNNING PSCAN ISCAN 
	RX bytes:1978 acl:31 sco:0 events:96 errors:0
	TX bytes:6491 acl:18 sco:0 commands:76 errors:0

run python service test

  • ls /usr/share/doc/python-bluez/examples/simple/ 
    asynchronous-inquiry.py  l2capclient.py  rfcomm-client.py  sdp-browse.py
inquiry.py		 l2capserver.py  rfcomm-server.py
  • python3 /usr/share/doc/python-bluez/examples/simple/rfcomm-server.py 
    root@raspberrypi: ~# python3 rfcomm-server.py 
Waiting for connection on RFCOMM channel 1
Accepted connection from  ('C4:9F:4C:B2:FA:98', 1)
received [b'wwws']
received [b'ssss']
received [b'sddd']
received [b'ffgg']
[...省略]

systemd

  • /lib/systemd/system/rfcomm.service 
    [Unit]
Description=RFCOMM service
After=bluetooth.service
Requires=bluetooth.service

[Service]
ExecStart=/usr/bin/rfcomm watch hci0

[Install]
WantedBy=multi-user.target
  • sudo systemctl enable rfcomm or sudo systemctl disable rfcomm
  • minicom -s 
        +-----------------------------------------------------------------------+
    | A -    Serial Device      : /dev/rfcomm0                              |
    | B - Lockfile Location     : /var/lock                                 |
    | C -   Callin Program      :                                           |
    | D -  Callout Program      :                                           |
    | E -    Bps/Par/Bits       : 115200 8N1                                |
    | F - Hardware Flow Control : No                                        |
    | G - Software Flow Control : No                                        |
    |                                                                       |
    |    Change which setting?                                              |
    +-----------------------------------------------------------------------+
            | Screen and keyboard      |
            | Save setup as dfl        |
            | Save setup as..          |
            | Exit                     |
            | Exit from Minicom        |
            +--------------------------+
  • 测试通信 
    Welcome to minicom 2.7.1

OPTIONS: I18n
Compiled on Aug 13 2017, 15:25:34.
Port /dev/rfcomm0, 07:39:14

Press CTRL-A Z for help on special keys

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python server demo

#!/usr/bin/env python3
#-*- coding:utf-8 -*-

import bluetooth
import threading
#服务器套接字(用来接收新链接)
server_socket=None

#连接套接字服务子线程
def serveSocket(sock,info):
    #开个死循环等待客户端发送信息
    while True:
        #接收1024个字节,然后以UTF-8解码(中文),如果没有可以接收的信息则自动阻塞线程(API)
        receive=sock.recv(1024).decode('utf-8');
        #打印刚刚读到的东西(info=地址)
        print('['+str(info)+']'+receive);
        #为了返回好看点,加个换行
        receive=receive+"\n";
        #回传数据给发送者
        sock.send(receive.encode('utf-8'));

#主线程

#创建一个服务器套接字,用来监听端口
server_socket=bluetooth.BluetoothSocket(bluetooth.RFCOMM);
#允许任何地址的主机连接,未知参数:1(端口号,通道号)
server_socket.bind(("",1))
#监听端口/通道
server_socket.listen(1);

#开死循环 等待客户端连接
#本处应放在另外的子线程中
while True:
    #等待有人来连接,如果没人来,就阻塞线程等待(这本来要搞个会话池,以方便给不同的设备发送数据)
    sock,info=server_socket.accept();
    #打印有人来了的消息
    print(str(info[0])+' Connected!');
    #创建一个线程专门服务新来的连接(这本来应该搞个线程池来管理线程的)
    t=threading.Thread(target=serveSocket,args=(sock,info[0]))
    #设置线程守护,防止程序在线程结束前结束
    t.setDaemon(True)
    #启动线程
    t.start();