4 articles tagged with ""iot""
Your garage door, weather station, wireless thermometer, and car tire sensors are all screaming data into the air 24/7. I started listening. What I heard changed how I see the world — and my neighbor's yard.
What if you could send text messages to people kilometers away with no internet, no cell towers, and no monthly bill — using a $25 ESP32 board running open-source firmware? Welcome to LoRa and Meshtastic, the off-grid mesh radio network that actual hikers, preppers, and RF nerds are quietly building everywhere.
I pointed my RTL-SDR at 433MHz and my living room erupted in signals. My neighbor's weather station. Someone's wireless doorbell. A car key fob three houses down. A tire pressure sensor from a passing Toyota. All of them broadcasting in plain text, totally unencrypted, to literally anyone listening. Including me. Including you.
Ever wonder what your Bluetooth devices are actually broadcasting? I pointed my SDR at 2.4 GHz and discovered my Fitbit, smartwatch, and wireless headphones are CONSTANTLY chatting. Here's how I learned to sniff BLE (Bluetooth Low Energy) packets and what I found lurking in the wireless spectrum!