--- title: Reverse Engineering And Self-Hosting The OBI Smart... description: The OBI Energy Tracker is a €15 device pair sold by German DIY store OBI that reads electricity meters via IR and transmits data over 868 MHz LoRa to an... canonical: https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Reverse Engineering And Self-Hosting The OBI Smart Energy Tracker | daily.dev og:description: The OBI Energy Tracker is a €15 device pair sold by German DIY store OBI that reads electricity meters via IR and transmits data over 868 MHz LoRa to an... og:url: https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw og:image: https://api.daily.dev/og/posts/N0Cvczktw.png og:image:alt: Reverse Engineering And Self-Hosting The OBI Smart Energy Tracker og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Reverse Engineering And Self-Hosting The OBI Smart Energy Tracker **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary The OBI Energy Tracker is a €15 device pair sold by German DIY store OBI that reads electricity meters via IR and transmits data over 868 MHz LoRa to an ESP32-C3 gateway, which by default sends data to AWS via secure MQTT. Aaron Christophel reverse-engineered the gateway and documented two ways to self-host it locally: a no-flash reprovisioning method involving fetching the 32-bit TEA key, generating your own PKI, and running a local MQTTS broker with a provided Python script; and a custom firmware flash for the ESP32-C3, though UART/JTAG is disabled by the manufacturer. Both approaches and supporting code are available on GitHub, with accompanying English and German video walkthroughs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [I built a Zigbee sniffer on a $60 ESP32 screen, and now I can watch my smart home talk to itself](https://daily.dev/posts/i-built-a-zigbee-sniffer-on-a-60-esp32-screen-and-now-i-can-watch-my-smart-home-talk-to-itself-stmbiva5e) · XDA Developers · 0 upvotes · 0 comments - [An ESP32 device with Wireless M-Bus connectivity for Home Assistant](https://daily.dev/posts/an-esp32-device-with-wireless-m-bus-connectivity-for-home-assistant-xq2omxvb6) · CNX Software · 0 upvotes · 0 comments - [Reverse-engineering the iOmeter Bridge's Bluetooth onboarding](https://daily.dev/posts/reverse-engineering-the-iometer-bridge-s-bluetooth-onboarding-xmplhi4gd) · /dev/io · 1 upvotes · 0 comments - [Someone built an ultra-low-power ESP32 "Event Notifier" that tracks your sensors with minimal drain](https://daily.dev/posts/someone-built-an-ultra-low-power-esp32-event-notifier-that-tracks-your-sensors-with-minimal-drain-crnwbfzvf) · XDA Developers · 0 upvotes · 0 comments - [DIY ESP32-P4 weather station & air quality monitor connects to LoRa and ESP-NOW sensors, various weather APIs](https://daily.dev/posts/diy-esp32-p4-weather-station-air-quality-monitor-connects-to-lora-and-esp-now-sensors-various-wea-fyniccq3k) · CNX Software · 0 upvotes · 0 comments --- Tags: [#backend](https://daily.dev/tags/backend), [#iot](https://daily.dev/tags/iot), [#self-hosting](https://daily.dev/tags/self-hosting), [#reverse-engineering](https://daily.dev/tags/reverse-engineering) [View this post on daily.dev](https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Reverse Engineering And Self-Hosting The OBI Smart Energy Tracker","url":"https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw"},"datePublished":"2026-07-07T20:21:54.362Z","dateModified":"2026-07-07T20:22:11.609Z","description":"The OBI Energy Tracker is a €15 device pair sold by German DIY store OBI that reads electricity meters via IR and transmits data over 868 MHz LoRa to an...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/035cb48244579f21e75a1b4df7b29a8f?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/035cb48244579f21e75a1b4df7b29a8f?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/reverse-engineering-and-self-hosting-the-obi-smart-energy-tracker-n0cvczktw","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"backend,iot,self-hosting,reverse-engineering","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"Reverse Engineering And Self-Hosting The OBI Smart Energy Tracker"}]} ```