A C++ function to format an std::time_point as an ISO 8601 string. The C++ std chrono stuff is very useful but a bit of a head-wreck! One of the things I had problems with was how to take an std::time_point value and format it as a string with the fractional seconds / microseconds included. This […]
An amusing MS Teams related problem hit me this morning after I changed my Domain Password – The MS Teams App piped up and said it need Sign In, when I hit OK it seemd to restart and then repeated the message, we were in an infinite loop of fun! Now as much as I […]
Flask is a great python based HTTP server that’s really small and easy/fast to setup, it is really useful for deploying small Web based User Interfaces for IoT type devices. By default flask will attach itself to port 5000. To get my flask script to attach to port 80 I use: if __name__ == ‘__main__’: […]
Strange problem with Octave (my version is 4.4.0), in the GUI I can’t scroll the ‘Command Window’, so if some code outputs lots of info I can’t scroll up to see it all, the window keeps jumping to the bottom as I try to scroll! I am not sure why its happening, but a workaround […]
When using the Paho Javascript client from MQTT; when a message arrives via client.onMessageArrived(), how can we figure out the message’s topic. This threw me for a bit as the documentation for the message object doesn’t mention ‘topic’ at all – but it turns out that the topic name is stored in the message.destinationName field! […]
I have been using Hardkernel’s new Odroid N2 to develop a computer vision system with multiple Basler USB3 cameras. I have been using KDevelop on the Odroid to engineer the C++ code and in general all has been going very well (the Odroid N2 is a fantastic device). I did however hit an occasional problem […]
Update: I have written a simple Fire-And-Forget wrapper class for sending datagrams via UDP can be found here. It handles simple transmission use cases while hiding the (sometimes confusing) boost::asio details. However, if you are interested in the details then read on! Boost.ASIO is great but if you don’t use it everyday it can be […]
In Exif, each maker-note will have a unique (hex) id. ExifTool can be used to query a maker note’s contents by its id as follows: exiftool -u -b -Unknown_0x0013 image.jpg This will return the value for makernote id 0x0013 contained in image.jpg.
Link error using the Point Cloud Library and EuclideanClusterExtraction in Visual Studio 2017
Sending data to a serial port is quite easy in Bash, for example: echo “my packet data” > /dev/ttyS0 And you can read from a serial port using cat: cat /dev/ttyS0 However cat must typically be run from a different shell instance as it blocks waiting for data. So is it possible to write […]