pxt-calliope/docs/reference/radio/receive-number.md
2016-03-25 16:47:20 -07:00

35 lines
1008 B
Markdown

# 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.
```sig
radio.receiveNumber()
```
### Return value
* the first number [number](/microbit/reference/types/number) of the packet if any. `0` otherwise.
### Examples
Read the number broadcasted by other micro:bits.
```blocks
radio.onDataReceived(() => {
led.plotBarGraph(radio.receiveNumber(), 1023);
})
```
### See also
[receive number](/microbit/input/receive-number), [on data received](/microbit/reference/radio/on-data-received)