received Packet

Get one of the properties from the last received radio packet.

radio.receivedPacket(RadioPacketProperty.SignalStrength)

In addition to a number, string, or name-value pair, the packet received also contains other information about the transmission of the packet. You can get this additional information by selecting a property from the packet.

Parameters

  • type: the property type to get from the packet. These are:
    • signal strength: the strength of the radio signal when the packet was received.
    • serial number: the serial number of the board sending the packet.
    • time: the time when the packet was sent.

Returns

  • a number that is the property selected in the type parameter:
    • signal strength: the value ranges from -128 to -42 (-128 means a weak signal and -42 means a strong one.)
    • serial number: the value is the serial number of the board sending the packet.
    • time: the value is the system time, in microseconds, of the sender at the time when the packet was sent.

Example

This program uses the signal strength from received packets to graph the approximate distance between two micro:bits.

radio.setGroup(1)
basic.forever(() => {
    radio.sendNumber(0)
})
radio.onReceivedNumber(function (receivedNumber) {
    led.plotBarGraph(
        Math.abs(radio.receivedPacket(RadioPacketProperty.SignalStrength) + 42),
        128 - 42
    )
})

See also

set transmit serial number

radio