pxt-calliope/docs/reference/radio/receive-number.md

Receive Number

Reads the next radio packet if any and returns the first number.

Important Security Consideration

The functions in the radio namespace allow the BBC micro:bit to communicate with other micro:bits.

This API does not contain any form of encryption, authentication or authorization. It's purpose is solely for use as a teaching aid to demonstrate how simple communications operates, and to provide a sandpit through which learning can take place.

For serious applications, BLE should be considered a substantially more secure alternative.

radio.receiveNumber()

Return value

• the first number number of the packet if any. 0 otherwise.

Examples

Read the number broadcasted by other micro:bits.

radio.onDataReceived(() => {
    led.plotBarGraph(radio.receiveNumber(), 1023);
})

See also

receive number, on data received