Articles

Many web applications rely on the upload of files from client to server via a POST request. The content-type of this request is generally multipart/form-data. When developing the server-side of such application, being able to quickly test the upload feature can greatly increase productivity. So, I designed this simple web application that can POST a file to any URL.

Building applications in a microservice architecture has become more and more popular recently. With this design pattern, an application is composed of multiple services that run independently and generally share data across network protocols.

As part of a previous project, I installed an IoT lock on my front door, which allowed me to control it using my smartphone. However, having to take out my smartphone every time I want to unlock the door quickly becomes annoying. To improve on the situation, I installed an RFID reader on the lock, which I used in combination with an RFID ring which now serves as my key. To follow up on this trend of finding new ways to unlock my door, I decided to explore face recognition technologies.

Foreign models are quite in demand in Japan and as such it is not uncommon for foreigners living there to have a side activity in the modeling industry. I had the chance to meet the manager a <a href="https://azs-group.jp/" rel="noopener noreferrer nofollow">AZS entertainment</a> and was told that the agency was currently recruiting. So, since I am always looking for new life experiences, I decided to join.

The other day, I found myself putting on some weight. This rather surprised me as I thought I was having a healthy diet and exercised almost daily. To identify the root of the problem, I decided to start measuring my calorie intake as well as the macronutrients that constitute said intake.

Mosquitto can usually be installed on an Ubuntu server fairly easily using the APT package manager. By Default, the broker handles unencrypted MQTT connections but it can be configured to use SSL certificates obtained, for example, using Certbot and thus enable MQTTs connections. This configuration is usually achieved by editing the Mosquitto configuration file in /etc/mosquitto so as to point to certificates obtained independently. However, when deploying Mosquitto to Kubernetes, one would prefer not to edit configuration files manually after install. Moreover, in Kubernetes, one can use Cert-manager to obtain SSL certificates. Thus, this article presents an efficient method to deploy a secure MQTTs broker in Kubernetes.

With the cloud native multi-user MQTT platform deployed, I started designing IoT devices that I could distribute to end users. However, without a GUI, interacting with those devices would be difficult. Of course, one could install applications like MQTT dash or similar but this would require tedious configuration such as MQTT broker and topics. I wanted to give users a simpler UX so I made this simple control interface that automatically displays a users devices and allows those to be controlled.

There are multiple tools available for API testing, Postman and Insomnia being probably the most popular. However, those are desktop applications that need to be installed. I wanted a solution that I can use in the browser so I made a simple web application to achieve basic API testing functions.