In my earlier post I discussed installing the ESPurna firmware on the ESP-01 module, a ESP8266 based IoT device. The firmware provides a Web as well as a telnet UI. In this post we’ll be more focused on the CLI via telnet. More specifically, we’ll be looking at the wifi.scan command issued in a telnet session to determine wireless coverage. The ESP-01 module is well suited for tasks like determining wifi coverage. It is small, can operate on a small…
The Tonbux power strip is an IoT device that allows control of each power outlet from a mobile device. These are sold on Amazon for around $30 each. It has a closed firmware that does not allow direct access to the power strip. Instead, a mobile device app must be installed and control is done through the app. From the looks of it, the power strip publishes with MQTT to a cloud based broker. In turn the mobile device app…
In this post we’ll cover how to monitor inexpensive wireless security sensors. There are two types of wireless sensors that we’ll be working with, door reed switches and passive infra red motion detectors. Each of these sensors transmit a broadcast radio message on the 433Mhz frequency. We’ll be expanding on earlier work with RTL_433. This post will cover how to identify a specific sensor and take appropriate action as needed, all that with a single bash script, let’s begin. The…