Overview MQTT (Message Queuing Telemetry Transport) is a lightweight publish/subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks. It is widely used in IoT applications for efficient device-to-cloud and device-to-device communication. This guide covers how to configure an MQTT client on a Signetik device, publish messages from
By Jared Poulsen (July 2025) PCB Manufacturing is complicated. Parts go end of life, regulations and compliances are never ending, and components keep getting smaller, with tighter tolerances. On top of that, you need to manage supply chain lead times and recently, ever-changing tariffs. In a perfect world, we could
Introduction Signal processing has been around for many decades. Initially performed with hardware, it later migrated to software using DSPs (Digital Signal Processors). Even MCUs could perform basic signal processing tasks. In the early 2000s, we were processing audio on an ARM9 while processing video on a DSP, using Texas
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An MQTTS connection is an MQTT connection wrapped in a TLS secure layer. This connection may require authentication of the server only, but usually will require device authentication. This requires using the servers certificate as well as a device certificate and key. The test site, test.mosquitto.org, has instructions
This article describes the process of updating SigCell firmware over the air. If you have received a development kit, it is recommended to update to the latest firmware, using the instructions below. The steps are 1. Setup the details about the update server and update image. 2. Initiate a firmware
Note: In the following example, certificates are loaded to sectag 3. Wait until startup completes +notify,event:init,result:0,firmware:v1.0.9 +notify,carrier:connecting +notify,carrier:connected +notify,imei:352656100169179 +notify,event:coap,init:1 Disable connecting to setup certificates and server details +set,connect:0 expect