Link to source of sensor/radio bridge hex files.

Author: microbit-matt-hillsdon

src/device/firmware/README.md

@@ -1,7 +1,15 @@
+# Data collection hex files
+
+## Bluetooth
+
 The Bluetooth hex files are derived from https://makecode.microbit.org/_MdUU3fEqvRxw
 
 There's a universal hex with each Bluetooth mode. They are then split into individual hex files.
 
 It's important to keep these up-to-date with MakeCode releases so that the apps can partial flash over them.
 
 https://microbit-foundation.github.io/microbit-universal-hex/examples/separate.html
+
+## Radio bridge
+
+See https://github.com/microbit-foundation/sensor-radio-bridge