Ganesh Velrajan

Founder and CTO of SocketXP

Focussed on IoT, Edge Computing, Cloud and Security. 20+ years of experience in architecting and building data pipelines for the cloud data centers.

Latest Articles by Ganesh Velrajan

Build a Self-Hosted ngrok With a Reverse SSH Tunnel and Nginx

Nov 12, 2026

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19 min read

Build a Self-Hosted ngrok With a Reverse SSH Tunnel and Nginx

Expose a local web app on your own domain with HTTPS, like ngrok, using a reverse SSH tunnel, Nginx and Let's Encrypt on a hardened VPS. Tested configs included.

Detect Offline IoT Devices with MQTT Last Will and Heartbeats

Nov 12, 2026

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14 min read

Detect Offline IoT Devices with MQTT Last Will and Heartbeats

Detect offline IoT devices with MQTT Last Will and Testament, keepalive and heartbeat timeouts. Covers MQTT 5 Will Delay, reboot detection and alert debouncing, with code.

Monitor Raspberry Pi and ESP32 Devices with MQTT

Nov 12, 2026

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12 min read

Monitor Raspberry Pi and ESP32 Devices with MQTT

Monitor a Raspberry Pi and ESP32 fleet with MQTT: Pi throttling, under-voltage and SD card health, ESP32 heap, RSSI and reset reasons, plus a Pi gateway with a Mosquitto bridge.