RSA (RSAwithSHA1) raw signing with SHA1 hash PKCS#1 v1.5
Allan In an attempt to implement RSA signatures on a 32-bit MCU it was necessary to investigate and perform the hashing separate from the RSA signing. In doing so I have…
Setting up an email server with postfix, dovecot, postfixadmin, and roundcube
Recently setup a new email server on a CentOS Rocky 9 VPS server and thought I would document the process below. I pulled information from a variety of webpages and…
Setting up virtual hosting (vhosts) on a Linux server with https
This guide is written with the general understanding that the reader is mostly familiar with how to access and setup a VPS Linus server. Most commands will be done over…
Creating a new open source IoT platform, server side Python script, part 2
After taking a little break to resolve some SSL certificate issues we turn our attention back to the current issue at hand, the server side Python script. As seen in…
Easily creating self signed SSL X509 certificates
While working on an IoT project involving an MQTT server it came to be that I would be generating my own SSL certificates for the MQTT broker (mosquitto). There are…
Creating a new open source IoT platform, server side Python script
Coming back to the IoT platform after a little break. This time trying to work a little more on the server side and actually put together some working code and…
Creating a new open source IoT platform, the MQTT server/broker
So far we have come up with the architecture and the database structure for the new IoT platform. Next we should address the MQTT communications portion. The MQTT protocol is…
Creating a new open source IoT platform, creating the database, part 2
Next we will need to create the database structure that represents the hardware. This will include the hub, gateway, node, and sensors. As devices (gateways, nodes, sensors) are added (or…
Creating a new open source IoT platform, creating the database, part 1
In the previous posts we talked about how to assign ids and organize the data, but ultimately we will need to store this information somewhere and a relational database (such…
Creating a new open source IoT platform, assigning ids to data
In the course of developing an IoT platform the packet data structure needs to be decided. This is the data structure that is proposed to be used to send data…