pxt-calliope/docs/reference/radio/on-data-received.md

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# On Data Received
Registers code to run when a packet is received over ``radio``.
## 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.onDataReceived(() => {})
```
### Parameters
* body - is an action
### Example
```blocks
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X));
})
radio.onDataReceived(() => {
led.plotBarGraph(radio.receiveNumber(), 1023);
})
```
### See also
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[receive number](/reference/radio/receive-number), [send number](/radio/send-number), [set group](/reference/radio/set-group)
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