mqtt用户名或密码不正确

Question

我用python编写了关于在VS上运行的网关的代码。现在的问题是，我已经配置了mqtt的用户名和密码以及服务器的IP和端口，但返回值为rc=4(用户名或密码不正确(，我使用wireshark捕获数据包，我发送的CONNECT数据包是正确的，但返回的值显示用户名或密码错误

def __doPost(self):
self.__connectMqtt(host = host, port = port, mqttUsername = id, mqttPassword = token)
def __connectMqtt(self,host,port,mqttUsername,mqttPassword):
# Username = mqttUsername.encode("utf-8")
self.mqttc.username_pw_set(username=mqttUsername, password=mqttPassword)
# self.mqttc.subscribe(self.setTopic,1)
self.mqttc.on_connect=self.__on_connect
self.mqttc.on_message=self.__on_message
self.mqttc.on_publish=self.__on_publish
self.mqttc.on_disconnect=self.__on_disconnect
# self.mqttc.tls_set(ca_certs = r"C:UserschrisDesktopMobiusPi-Project-Templates-1.0.5helloworld-templatesrcroot.crt")
self.mqttc.connect(host, port, keepalive=200)
# self.publish(message = "SUPCON Test")
self.mqttc.publish_to_mqtt = self.publish_to_mqtt()
# self.mqttc.subscribe_gateway = self.subscribe_gateway()
self.mqttc.loop_forever()
def __on_connect(self,client, userdata, flags, rc):
"""
The value of rc indicates success or not:
0: Connection successful
1: Connection refused - incorrect protocol version
2: Connection refused - invalid client identifier
3: Connection refused - server unavailable
4: Connection refused - bad username or password
5: Connection refused - not authorised
6-255: Currently unused.
"""
if   rc==0:
print("Connect successful")
elif rc==1:
print("incorrect protocol version")
elif rc==2:
print("invalid client identifier")
elif rc==3:
print("server unavailable")
elif rc==4:
print("bad username or password")
# print (client,flags)
elif rc==5:
print("not authorised")
elif 6<rc<255:
print("Currently unused")
else:
print("Connect failed")
def __on_message(self,client, userdata, message):
message=message.payload.decode('utf8')
print('receive message:%s'%(message)) 
def __on_publish(self,client, userdata, mid):
print('publish message success mid:%s'%(mid))

def __on_disconnect(self,client,userdata,rc):
if rc==0:
print('disconnect success')
else:
print('disconnect fail')

Answer 1

哦，我已经解决了这个问题。因为每个网关都有客户端ID，我需要连接的服务器需要指定客户端ID，并且不可能连接到任何东西。我需要定义要连接的客户端ID。

如果您的网关没有连接到服务器，并且返回的错误是错误的用户名或密码，则可能是clientID错误。