The Raspberry Pi has 40 General purpose Input/output Pins (GPIO) that can be used for controlling external hardware. There are a number of add-on boards called hats which plug into these pins and provide various sensors. The most common one being the sense hat.
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Simple Python MQTT Topic Logger
The MQTT data logger logs data to all monitored topics to the same log files. If the data need to be split into topics then it will need to be done by the log analyser software.
Continue readingRepublish HTML Data Over MQTT (Flight Arrivals )
HTTP is the protocol that powers the Web,and is the most common protocol on the Internet. Because http is a request/response protocol a visitor viewing a web page must issue a new request in order to refresh the data.
Continue readingLogging MQTT Sensor Data to SQL DataBase With Python
Most MQTT brokers don’t provide any mechanism for logging historical data. In this project we will create a simple data logger that logs data to a sqlite database.
Continue readingChecking Active MQTT Client Connections
This tutorial is in response to a question I received on the client connections tutorial page: I’ve been struggling to find a real client connection status tool, dashboard or anything which will show a list of my clients and their connection status. Clearly the broker via the low-level protocol mechanics maintain an MQTT keepalive table for each client — that’s how Last Will and Testament (LWT) is triggered internally by the broker. However how does one display such table? The problem is that you have no way of accessing the connections table on the broker so the only way is to
Continue readingChecking MQTT Subscription Acknowledgements- Python Code Examples
When you subscribe to an MQTT topic there is always a change that the subscription will fail. Therefore it is important that your code checks that the subscription succeeded.
Continue readingHow to Send and Receive JSON Data Over MQTT with Python
Encoding data in JSON is popular for sending data over the Internet, and also for storing data. You can encode a Python List or dictionary in JSON format and then decode it back into a list or dictionary as illustrated in the diagram below:
Continue readingHow to Send a File Using MQTT and Python
In this tutorial will will look at how we can send a file or picture using MQTT. The script is written in Python and the approach I used was to send the file as bytes.
Continue readingHow to Encrypt MQTT Payloads with Python – Example Code
Encrypting the MQTT payload rather than the link has the advantage that the data is encrypted end to end and not just between the broker and the client.
Continue readingSimple Python MQTT Data Logger
Most MQTT brokers don’t provide any mechanism for logging historical data for later analysis. However due to the publish/subscribe nature of MQTT is is easy to monitor, and log a data stream or streams using an MQTT client.
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