I wanted to develop an APRS client on an MCU (ESP-32) instead of a SBC (Raspberry Pi).
This client would use a modem/radio combination (Mobilinkd TNC3/Baofeng UV-5R) to get on the air (144.390 MHz). The client connects to the TNC3 over a Bluetooth Low Energy (BLE) link and is secure against Man-In-The-Middle attacks,
Looking around, I settled on hardware similar to that Amazon’s AWS IoT EduKit workshop uses https://edukit.workshop.aws/en/ but using APRS instead of the internet—of course.
The video demonstrates the first step in using APRS–position beaconing and registering with a station having an APRS-IS (internet) connection. After the first beacon, you must transmit a beacon every 30 minutes to stay current in the system.
Step 1 for APRS, beacon your position and register with APRS-IS. Step 2 to follow…
Video Notes: Next time use a script It’s APRS-IS not -SI Be cool. Don’t sound so excited when it works!
Armstrong and Aldrin did their own test. Just a moment after he became the first human being to step onto the Moon, Armstrong had scooped a bit of lunar dirt into a sample bag and put it in a pocket of his spacesuit—a contingency sample, in the event the astronauts had to leave suddenly without collecting rocks. Back inside the lunar module the duo opened the bag and spread the lunar soil on top of the ascent engine. As they repressurized the cabin, they watched to see if the dirt started to smolder. “If it did, we’d stop pressurization, open the hatch and toss it out,” Aldrin explained. “But nothing happened.”