使用Python通过蓝牙串口通信

Question

如何通过Python和蓝牙处理和接收串行数据？

我正在尝试制作一个简单的Python服务器，通过蓝牙访问数据，具体实现可以参考这里。

我的server.py文件将在收到文本“temp”时发送一个随机数：

#!/usr/bin/env python

import os
import glob
import time
import random

from bluetooth import *

def read_temp():
    return random.random()

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

port = server_sock.getsockname()[1]

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

advertise_service( server_sock, "TestServer",
                   service_id = uuid,
                   service_classes = [ uuid, SERIAL_PORT_CLASS ],
                   profiles = [ SERIAL_PORT_PROFILE ], 
#                   protocols = [ OBEX_UUID ] 
                    )
while True:          
    print "Waiting for connection on RFCOMM channel %d" % port

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

    try:
        data = client_sock.recv(1024)
        if len(data) == 0: break
        print "received [%s]" % data

        if data == 'temp':
            data = str(read_temp())+'!'
            client_sock.send(data)
        else:
            data = 'WTF!' 
            client_sock.send(data)
        print "sending [%s]" % data

    except IOError:
        pass

    except KeyboardInterrupt:

        print "disconnected"

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

        break

当我第一次运行时，出现了以下错误：

bluetooth.btcommon.BluetoothError: (2, 'No such file or directory')

根据谷歌搜索结果，需要通过编辑文件/lib/systemd/system/bluetooth.service并更改以下行来启用兼容模式并加载串行配置文件，以解决问题：

Googled showed

ExecStart=/usr/lib/bluetooth/bluetoothd

to:

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

然后运行sudo sdptool add SP。现在，python server.py似乎没有错误地运行，并且我可以将运行它的机器与我的Android手机配对。但是，它似乎无法接收任何数据。我尝试使用蓝牙终端仿真应用程序，如BlueTerm、BT Simple Terminal和Arduino BT，但当我连接到服务器输入文本并按下回车键时，server.py没有响应。它最初会报告“已接受连接...”并收到一个空字符串，但之后就什么也没收到了。由于没有明确的错误报告，我不知道如何诊断问题。我该如何确定问题是否出在我的Python代码上？还是服务器上的蓝牙配置？或者是我的Android手机？

- Cerin

Answer 1

正确的代码是：

#!/usr/bin/env python
"""
A simple test server that returns a random number when sent the text "temp" via Bluetooth serial.
"""

import os
import glob
import time
import random

from bluetooth import *

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

port = server_sock.getsockname()[1]

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

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

print "Waiting for connection on RFCOMM channel %d" % port
client_sock, client_info = server_sock.accept()
print "Accepted connection from ", client_info

while True:          

    try:
        req = client_sock.recv(1024)
        if len(req) == 0:
            break
        print "received [%s]" % req

        data = None
        if req in ('temp', '*temp'):
            data = str(random.random())+'!'
        else:
            pass

        if data:
            print "sending [%s]" % data
            client_sock.send(data)

    except IOError:
        pass

    except KeyboardInterrupt:

        print "disconnected"

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

        break

- Cerin

Answer 2

你也可以看看Bleak，访问https://pypi.org/project/bleak/。Bleak是一个GATT客户端软件，能够连接到充当GATT服务器的BLE设备。它旨在提供异步、跨平台的Python API，以连接和与例如传感器通信。

- Mark Parris

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我认为bleak不提供串行通信。 - srokatonie