我整天都在尝试解决问题，做了很多研究，尝试了许多不同的方法，但是没有一个起作用。我目前有一个使用bluepy连接到蓝牙BLE设备的代码，当它连接正常时，但是有时它无法连接并且不会出错，只是在[00:00:00]行中被吸住了： 00:00]正在连接，并且不会显示在“例外”中。当我发送新命令时，有时可以正常工作，但是由于我没有收到错误或任何信息，因此我不确定何时需要发送新命令。

下面是代码：

#!/usr/bin/env python
from bluepy import *
import paho.mqtt.client as mqtt
import struct

### Variables

mqtt_client = ""
mqtt_port = 
mqtt_user = ""
mqtt_password = ""
mqtt_path = ""

####  Don't edit below here

open = "\x00\xff\x00\x00\x9a\x0d\x01\x00\x96"
close = "\x00\xff\x00\x00\x9a\x0d\x01\x64\xf2"

def shade_command(fble,fcmd):
      try:
        print "["+ fble + "] Connecting"
        dev = btle.Peripheral(fble)
        print "["+ fble + "] Connected!"
        chs = dev.getcharacteristics()
        for ch in chs:
          if ch.uuid == "0000fe51-0000-1000-8000-00805f9b34fb":
            ch.write(fcmd)
        dev.disconnect
        print  "["+ fble + "] Disconnected"
      except:
        print "["+ fble + "] Error Connecting"

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client,userdata,flags,rc):
    print("Connected to MQTT with result code "+str(rc))

    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe(mqtt_path + "/#")

# The callback for when a PUBLISH message is received from the server.
def on_message(client,msg):
    if msg.payload == "open":
        address = msg.topic.replace(mqtt_path + "/","")
        result = shade_command(address,open)
        if result == True:
          print msg.topic + "/status"
          client.publish(msg.topic + "/status","on",qos=0,retain=False)
    if msg.payload == "close":
        address = msg.topic.replace(mqtt_path + "/",close)
        if result == True:
          client.publish(msg.topic + "/status","off",retain=False)
          print msg.topic + "/status"

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.username_pw_set(mqtt_user,password=mqtt_password)
client.connect(mqtt_client,mqtt_port,60)

问题在这里发生：

def shade_command(fble,fcmd):
      try:
        print "["+ fble + "] Connecting"
        dev = btle.Peripheral(fble)
        print "["+ fble + "] Connected!"
        chs = dev.getcharacteristics()
        for ch in chs:
          if ch.uuid == "0000fe51-0000-1000-8000-00805f9b34fb":
            ch.write(fcmd)
        dev.disconnect
        print  "["+ fble + "] Disconnected"
      except:
        print "["+ fble + "] Error Connecting"

当我尝试连接到MAC地址并且不起作用时，我没有收到错误消息，只是在这段代码之后停下来：

        print "["+ fble + "] Connecting"
        dev = btle.Peripheral(fble)

我最后看到的是[00：00：00：00：00]正在连接，什么都没有！我期待看到例外代码。

下面是一个输出示例，当我发送MQTT命令时，它首先尝试连接，但是什么也没有发生，它只是停止了，而不是我发送了另一个命令，并且它起作用了，我知道它在显示“ Connecting”，“连接的！”和“已断开连接”

[02:B3:CD:3D:C5:34] Connecting
[02:B3:CD:3D:C5:34] Connecting
[02:B3:CD:3D:C5:34] Connected!
[02:B3:CD:3D:C5:34] Disconnected

编辑1：

试图使用下面的除外代码，但不起作用：

except btle.BTLEException as e:

编辑2：

现在感谢@hardillb，我知道paho mqtt是捕获错误并忽略它们的人，我添加了这段代码，现在我可以看到何时发生错误：

def on_log(client,level,buff):  # mqtt logs function
    print buff

client.on_log = on_log

当我遇到错误时，它显示如下：

Caught exception in on_message: global name 'traceback' is not defined