Telemetry over Opportunistic WiFi Links (ESP8266)
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Lukas Klinger 663da16f55 sort points 2 years ago
dnslogger-poc fixed issue 3 years ago
towl-esp8266 added SD card support 5 years ago
web-interface sort points 2 years ago first commit 7 years ago


Note: This is an experimental project. No warranties, functionality, or suitability for any application are implied.

  • Near-real time GPS data via random open / captive portal hotspots
  • Uses DNS recursion to send telemetry data
  • Stores waypoints in RAM between successful transmissions
  • Designed to be subscription-free, super-low cost telemetry device


Example GPS modules.

YMMV. Also consider eBay.




Connect GPS power & ground as appropriate and wire the GPS TX line to Pin 3 (RX) on the digistump oak. (I recommend testing the GPS module with an FTDI serial adapter first to ensure you're receiving NMEA data at the expected baud rate.)

Be sure to configure the GPS baud rate at the top of the towl .ino file. (See README)


You'll need to add an NS record to the DNS table of a domain you control, designating a subdomain namesrever for the TOWL telemetry query catcher.

E.g. if you own the domain "", you could designate a server to receive the TOWL queries by creating a NS record for "", pointing at the server you intend to run the catcher on. If said server is at IP address, then that record looks something akin to:


Run the PoC code on the designated server. Be sure to configure both the TOWL devices and the server code for the "" domain name. (See README under each directory for instructions.)

Have fun experimenting! K.C. -/-