上周我问了这个问题，但觉得我没有提供足够的信息并完全解释我在做什么。所以我正在打开一个新的、有更好记录的问题，希望它更容易理解。
我正在开发一个 python 模块/库，它将允许使用 hivemq 网站 (www.hivemq.com/plugins) 上的文件身份验证插件的自定义版本连接到 hivemq 代理。此插件使用 http 身份验证而不是文件身份验证。
此 python 模块用于将 raspberry-pi2 连接到 hivemq 代理，但我遇到了身份验证问题。pi 将在没有插件的情况下连接。从 on_log 和 on_message 函数显示这些消息：
16 Received CONNACK (0, 0)
connected with the result code 0
但是，只要我将身份验证插件添加到代理，它就会给我以下消息：
16 Received CONNACK (0, 5)
connected with the result code 5
据我了解，结果代码 5 表示由于未经授权而被拒绝。
我也从经纪人那里得到这条消息：
ERROR- Could not get valid results from the webservice
org.apache.http.NoHttpResponseException: The targer server failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpRespoonseParser.hava:143)
我在上一个问题中被告知这是由于代理没有找到 http 服务器。但是我只有在树莓派连接时才会收到此消息，所以我不明白为什么它可以找到其他设备而不是 pi。
我的模块代码如下：
import paho.mqtt.client as mqtt
#import base64
#create a client instance
client = mqtt.Client()
#The callback for when the client recieves a CONNACK response from the server
def on_connect(client, userdata, flags, rc):
print("connected with the result code "+str(rc))
#print("usrData: "+str(userdata))
#print("client: " +str(client))
#print("flags: " +str(flags))
#Define any topics you would like the pi to
#automatically subscribe to here
#The callback for when this client publishes to the server.
def on_publish(client, userdata, mid):
print("message published")
#The callback for when a PUBLISH message is recieve from the server.
def on_message(client, userdata, msg):
print(msg.topic+" "+str(msg.payload))
def on_log(client, userdata, level, buf):
print(str(level)+" "+str(buf))
#set callbacks
def setup():
client.on_connect = on_connect
client.on_message = on_message
client.on_publish = on_publish
client.on_log = on_log
#setup connection to broker
def connect(username, password):
client.username_pw_set(username, password)
#client.connect("mqtt.owly.uk")
client.connect("10.19.110.73")
#publish to a topic
def publish(topic, message):
client.publish(topic, message)
def loop():
client.loop()
我认为问题在于 paho 客户端如何格式化对代理的请求。我真的想不出还有什么可能。我有 arduinos 连接到它，mqtt.fx 客户端连接，唯一的问题是树莓派。
很抱歉这个冗长的问题，并提前感谢您的帮助。
编辑：添加了带有数据包详细信息的 tcpdump
pi@raspberrypi ~ $ sudo tcpdump -nnXSs 0 port 1883
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
10:36:12.626081 IP 10.19.8.61.60353 > 52.30.179.227.1883: Flags [S], seq 1221863 198, win 29200, options [mss 1460,sackOK,TS val 227462 ecr 0,nop,wscale 7], leng th 0
0x0000: 4500 003c 5f98 4000 4006 e0d2 0a13 083d E..<_.@.@......=
0x0010: 341e b3e3 ebc1 075b 48d4 271e 0000 0000 4......[H.'.....
0x0020: a002 7210 fa7f 0000 0204 05b4 0402 080a ..r.............
0x0030: 0003 7886 0000 0000 0103 0307 ..x.........
10:36:12.638249 IP 52.30.179.227.1883 > 10.19.8.61.60353: Flags [S.], seq 104987 220, ack 1221863199, win 17898, options [mss 8961,sackOK,TS val 1882686450 ecr 2 27462,nop,wscale 7], length 0
0x0000: 4500 003c 0000 4000 3106 4f6b 341e b3e3 E..<..@.1.Ok4...
0x0010: 0a13 083d 075b ebc1 0641 fa54 48d4 271f ...=.[...A.TH.'.
0x0020: a012 45ea 1a0e 0000 0204 2301 0402 080a ..E.......#.....
0x0030: 7037 83f2 0003 7886 0103 0307 p7....x.....
10:36:12.638365 IP 10.19.8.61.60353 > 52.30.179.227.1883: Flags [.], ack 1049872 21, win 229, options [nop,nop,TS val 227464 ecr 1882686450], length 0
0x0000: 4500 0034 5f99 4000 4006 e0d9 0a13 083d E..4_.@.@......=
0x0010: 341e b3e3 ebc1 075b 48d4 271f 0641 fa55 4......[H.'..A.U
0x0020: 8010 00e5 fa77 0000 0101 080a 0003 7888 .....w........x.
0x0030: 7037 83f2 p7..
10:36:12.639260 IP 10.19.8.61.60353 > 52.30.179.227.1883: Flags [P.], seq 122186 3199:1221863304, ack 104987221, win 229, options [nop,nop,TS val 227464 ecr 1882 686450], length 105
0x0000: 4500 009d 5f9a 4000 4006 e06f 0a13 083d E..._.@.@..o...=
0x0010: 341e b3e3 ebc1 075b 48d4 271f 0641 fa55 4......[H.'..A.U
0x0020: 8018 00e5 fae0 0000 0101 080a 0003 7888 ..............x.
0x0030: 7037 83f2 1067 0006 4d51 4973 6470 03c2 p7...g..MQIsdp..
0x0040: 003c 0017 7061 686f 2f43 3844 3032 3037 .<..paho/C8D0207
0x0050: 4432 3344 3935 4636 3437 4600 1f39 6136 D23D95F647F..9a6
0x0060: 3632 6235 3934 6566 6632 3237 6661 6131 62b594eff227faa1
0x0070: 6435 6365 6436 3937 3065 6665 001f 3039 d5ced6970efe..09
0x0080: 6630 3865 3762 3432 3336 3266 6661 6435 f08e7b42362ffad5
0x0090: 6430 6664 3237 3836 3561 6231 37 d0fd27865ab17
10:36:12.651185 IP 52.30.179.227.1883 > 10.19.8.61.60353: Flags [.], ack 1221863 304, win 140, options [nop,nop,TS val 1882686463 ecr 227464], length 0
0x0000: 4500 0034 79aa 4000 3106 d5c8 341e b3e3 E..4y.@.1...4...
0x0010: 0a13 083d 075b ebc1 0641 fa55 48d4 2788 ...=.[...A.UH.'.
0x0020: 8010 008c ab0d 0000 0101 080a 7037 83ff ............p7..
0x0030: 0003 7888 ..x.
10:36:12.654912 IP 52.30.179.227.1883 > 10.19.8.61.60353: Flags [P.], seq 104987 221:104987225, ack 1221863304, win 140, options [nop,nop,TS val 1882686467 ecr 2 27464], length 4
0x0000: 4500 0038 79ab 4000 3106 d5c3 341e b3e3 E..8y.@.1...4...
0x0010: 0a13 083d 075b ebc1 0641 fa55 48d4 2788 ...=.[...A.UH.'.
0x0020: 8018 008c 8af6 0000 0101 080a 7037 8403 ............p7..
0x0030: 0003 7888 2002 0005 ..x.....
10:36:12.654954 IP 10.19.8.61.60353 > 52.30.179.227.1883: Flags [.], ack 1049872 25, win 229, options [nop,nop,TS val 227465 ecr 1882686467], length 0
0x0000: 4500 0034 5f9b 4000 4006 e0d7 0a13 083d E..4_.@.@......=
0x0010: 341e b3e3 ebc1 075b 48d4 2788 0641 fa59 4......[H.'..A.Y
0x0020: 8010 00e5 fa77 0000 0101 080a 0003 7889 .....w........x.
0x0030: 7037 8403 p7..
10:36:12.654915 IP 52.30.179.227.1883 > 10.19.8.61.60353: Flags [F.], seq 104987 225, ack 1221863304, win 140, options [nop,nop,TS val 1882686467 ecr 227464], le ngth 0
0x0000: 4500 0034 79ac 4000 3106 d5c6 341e b3e3 E..4y.@.1...4...
0x0010: 0a13 083d 075b ebc1 0641 fa59 48d4 2788 ...=.[...A.YH.'.
0x0020: 8011 008c ab04 0000 0101 080a 7037 8403 ............p7..
0x0030: 0003 7888 ..x.
10:36:12.655687 IP 10.19.8.61.60353 > 52.30.179.227.1883: Flags [F.], seq 122186 3304, ack 104987226, win 229, options [nop,nop,TS val 227465 ecr 1882686467], le ngth 0
0x0000: 4500 0034 5f9c 4000 4006 e0d6 0a13 083d E..4_.@.@......=
0x0010: 341e b3e3 ebc1 075b 48d4 2788 0641 fa5a 4......[H.'..A.Z
0x0020: 8011 00e5 fa77 0000 0101 080a 0003 7889 .....w........x.
0x0030: 7037 8403 p7..
10:36:12.667605 IP 52.30.179.227.1883 > 10.19.8.61.60353: Flags [.], ack 1221863 305, win 140, options [nop,nop,TS val 1882686480 ecr 227465], length 0
0x0000: 4500 0034 79ad 4000 3106 d5c5 341e b3e3 E..4y.@.1...4...
0x0010: 0a13 083d 075b ebc1 0641 fa5a 48d4 2789 ...=.[...A.ZH.'.
0x0020: 8010 008c aaf5 0000 0101 080a 7037 8410 ............p7..
0x0030: 0003 7889 ..x.
^C
10 packets captured
10 packets received by filter
0 packets dropped by kernel