Add ThingsBoard LwM2M OTA Updates to ESP32
Prepare a tagged ESP32 firmware release and use ThingsBoard LwM2M Object 5 to update from v01 to v02 over the existing X.509 DTLS connection.
IoT & Embedded Systems
Engineering field notes
Practical DevOps & Infrastructure Notes
Tested guides for Linux, cloud, containers, and self-hosted services.
Latest articles
IoT & Embedded Systems
Migrate ESP32 Telemetry from MQTT to LwM2M with X.509 Authentication to ThingsBoard
Migrate an existing ESP32 from MQTT to LwM2M with Anjay and X.509 DTLS. Configure ThingsBoard, reuse the device identity, flash over USB, and verify temperature and humidity telemetry.
Cloud, Linux & Virtualization, DevOps & Software Delivery, IoT & Embedded Systems
Patch ThingsBoard, Build Your Own Debian Package, and Deploy It
Patch the ThingsBoard release already installed on your server, test the change, build a custom Debian package, and deploy it on Ubuntu with backups and rollback.
Cloud, Linux & Virtualization, IoT & Embedded Systems
Upgrade ThingsBoard CE 4.3.1.6 to 4.4 on Ubuntu with a Community Grant
Evaluate device growth and licensing before upgrading ThingsBoard CE 4.3 to 4.4. Follow the Community Grant and Ubuntu upgrade process, or keep using Apache-licensed CE 4.3.
Cloud, Linux & Virtualization, Networking & Connectivity
Boot the Ubuntu Installer on a Target Machine via PXE with MikroTik DHCP and an Ubuntu Boot Server
Boot the Ubuntu installer on a target machine using MikroTik DHCP and an Ubuntu boot server that provides TFTP boot files and read-only NFS installation media.
AI & Desktop Tools
Build a Local RAG for Structural Design Codes with Python, Qdrant, and GPT
Build a local RAG index from one structural design code PDF, search it with Qwen3-Embedding-0.6B and Qdrant, and let Codex answer from visible excerpts with PDF page references.
AI & Desktop Tools
Use AI, IFC, and OpenSees to Simulate a Building Design Workflow
Follow a simulated RC office from architectural requirements through OpenSees analysis, coordination feedback, and a scoped reinforcement drawing, with AI assisting each stage.
Identity, Security & PKI
Issue a Let’s Encrypt DNS-01 Certificate on Ubuntu and Import It into Synology DSM 7.4
Issue a Let’s Encrypt certificate with Cloudflare DNS-01 on Ubuntu, import it through Synology DSM, and optionally automate renewal with restricted SSH delivery and a DSM-side worker.
Cloud, Linux & Virtualization
Install MeshCentral on Ubuntu 26.04 with Cloudflare DNS-01 and Direct HTTPS
Install MeshCentral on Ubuntu 26.04 as a systemd service with direct HTTPS, then use Cloudflare DNS-01 for Let’s Encrypt certificate issuance and renewal in an internal-only deployment.
Observability & Operations
Restore a Physical Windows Server 2016 Backup to a KVM Virtual Machine with Veeam
Restore a Veeam Agent backup of Windows Server 2016 to an isolated KVM virtual machine and verify that it boots. Includes a conditional StorAHCI recovery procedure for boot-device errors.