从 Raspberry Pi 上的 Python 脚本发布 MQTT 消息 [英] Publishing MQTT messages from a Python script on a Raspberry Pi

问题描述

我正在尝试配置 Raspberry Pi(Raspbian、Jessie)以将温度数据从 DS18B20 传感器发送到我的 MQTT 代理.

I am trying to configure a Raspberry Pi (Raspbian, Jessie) to send temperature data from a DS18B20 sensor to my MQTT broker.

我已经安装了 mosquitto、mosquitto-clients 和 python-mosquitto.我也安装了 paho-mqtt.

I have installed mosquitto, mosquitto-clients, and python-mosquitto. I have also installed paho-mqtt.

Mosquitto 似乎工作正常；我可以从命令行发布，但我无法获得任何我编写或找到的要发布或订阅的 Python 脚本.

Mosquitto seems to be working fine; I can publish from the command line but I can not get ANY python script I've written or found to publish or subscribe.

为什么这可以从命令行工作，

Why does this work from the command line,

mosquitto_pub -h 192.168.0.21 -d -t test/test -m "Hello world!"

而这个脚本没有?

 #!/usr/bin/env python

 import paho.mqtt.client as mqtt

 # set up the mqtt client
 mqttc = mqtt.Client("python_pub")

 # the server to publish to, and corresponding port
 mqttc.connect("192.168.0.21", 1883)

 # the topic to publish to, and the message to publish
 mqttc.publish("test/test", "Hello world!")

 # establish a two-second timeout
 mqttc.loop(2)

提前致谢！

通过实验，我发现通过将脚本中的 IP 更改为 Pi 本身的 IP，我可以发布 Pi 接收到的 MQTT.Pi 还可以接收发布到它的消息.但是，我仍然无法从脚本发布到外部代理.所以现在我认为这是经纪人问题...

Experimenting, I found that by changing the IP in the script to that of the Pi itself, I CAN publish MQTT that is received by the Pi. The Pi can also receive messages published to it. I still, however, can't publish from a script to an external broker. So now I'm thinking it's a broker issue...

推荐答案

如评论中所述，您发布的代码确实有效，但用于发布 single 留言这种形式更好

As mentioned in the comment, the code you posted does work, but for publishing a single message this form is better

#!/usr/bin/env python
import paho.mqtt.publish as publish

publish.single("test/test", "Hello world!", hostname="192.168.0.21")

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