SAM DUMONT

Freelance Cloud & AI Platform Engineer | ex-AWS
Data platforms · Garmin apps · Sensor firmware · Remote-first

Laeken, Belgium

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backup ble bluetooth bot-detection claude code claude-code e-invoicing embedded esp32 firmware garmin gickup gitea github go kubernetes legacy-software nginx nrf52 open-source openerp peppol protocol python reverse-engineering security self-hosting skills softdevice telemetry terraform voice writing

Reverse-engineering the Garmin HRM 600: native Running Dynamics from a fake strap

Decoding the Garmin HRM 600's BLE stack (Multi-Link, GFDI, EventSharing protobuf) until a Fenix 8 showed native Running Dynamics from an ESP32 that never touched a chest. A Bluetooth sniffer, a couple dozen probe scripts, an encryption wall, and a decompiled Android app, AI-directed by someone who isn't a reverse engineer.

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reverse-engineering bluetooth garmin esp32 protocol claude-code

Two BLE identities on one nRF52832: sequential MAC switching for Garmin pairing

How I made one BLE chip serve standard HRS and a custom Connect IQ service simultaneously on a Movesense sensor, by switching the GAP identity address mid-connection on S132 v6.1.1.

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ble nrf52 embedded softdevice garmin firmware claude-code

Backing up GitHub repos properly: git, metadata, and a browsable mirror

A four-tool setup on Kubernetes that backs up all your GitHub repos to NFS bare clones, exports issues/PRs/labels as JSON, and runs a self-hosted Gitea mirror with full metadata. With config examples, API gotchas, the Gitea mirror bug that cost me 3 hours, and why there's no clean incremental metadata sync.

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github backup gitea kubernetes self-hosting gickup terraform claude code

Building a custom voice skill for Claude Code

How to extract your writing voice from a corpus of your own text and turn it into a Claude Code skill, using a 3-pass process that produces rules you'd never think to write yourself.

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claude-code writing voice open-source skills

Using AI to poison AI

How I used Claude Code to build a five-layer defense system that serves a fake CV to AI crawlers, including the part where Claude refused to help.

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claude-code nginx bot-detection security

Reverse-engineering Race-Keeper's .rkd binary format in one afternoon

How I decoded Race-Keeper .rkd telemetry files with Claude Code: GPS, accelerometer, and gyroscope data from a track day in supercars.

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reverse-engineering claude-code python go telemetry

Adding PEPPOL e-invoicing to a 13-year-old ERP with Claude Code

How I built a full PEPPOL integration for OpenERP 7.0 in 2-3 weeks with Claude: provider abstraction, Belgian tax edge cases, and switching API providers in 4 days.

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claude-code peppol openerp legacy-software python e-invoicing