mqtt web sockets code publish.single(topic, payload,....does not work.

1 次查看（过去 30 天）
Barnard Richards
Barnard Richards 2020-5-22
评论： Barnard Richards 2021-2-23
The example code
Publish Using WebSockets in Python on a Raspberry Pi
https://au.mathworks.com/help/thingspeak/use-raspberry-pi-board-that-runs-python-websockets-to-publish-to-a-channel.html
does not work.
my python 3 code executes to the last line of the ThingSpeak example code
print ("There was an error while publishing the data.")
I have been successfully using the same channelID, writeAPIKey and mqttAPIKey with a Arduino for some time using code at
https://au.mathworks.com/help/thingspeak/use-arduino-client-to-publish-to-a-channel.html
How do do I identify the error with the web sockets publish code.
try:
publish.single(topic,payload,...
i can print on Terminal the topic and payload strings. they appear correct.
  4 个评论
显示 2更早的评论
Graham Coulby
Graham Coulby 2021-2-23
You probably already figured this out by now, but generally when you see <> in strings on APIs it means a placeholder. Therefore you must replace the string in the documentation (including the <>) with what is specified inside the <>:
e.g.:
If it states
channelID = "<YOUR-CHANNEL-ID>"
This becomes:
channelID = "1234567".
Did you ever get data on your channel? My arduino connects, and even publishes the message the payload without error to what appears to be the correct topic /channels/<channel_id>/publish/<channel_write_api>. However, no data is received on the channel.
Barnard Richards
Barnard Richards 2021-2-23
Graham, You are correct my Rasp Pi connects and uploads correctly.
I am also uploading from a couple of Arduino MKR1010 successfully.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

社区

更多回答在  ThingSpeak Community

类别

在 Help Center 和 File Exchange 中查找有关 Write Data to Channel 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by