Update 'radio' docs for v1 (#937)

docs/reference/radio/get-received-packet-property.md

@@ -0,0 +1,39 @@
+# get Received Packet Property
+
+Get one of the properties from the last received radio packet.
+
+```sig
+radio.getReceivedPacketProperty(radio.PacketProperty.SignalStrength)
+```
+
+## 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](/types/number) that is the property selected in the **type** parameter.
+
+## Example
+
+This program uses the signal strength from received packets to graph the
+approximate distance between two @boardname@s.
+
+```blocks
+basic.forever(() => {
+    radio.sendNumber(0)
+})
+radio.onReceivedNumber(function (receivedNumber) {
+    led.plotBarGraph(
+        Math.abs(radio.getReceivedPacketProperty(radio.PacketProperty.SignalStrength) + 42),
+        128 - 42
+    )
+})
+```
+
+## See also
+
+[set transmit serial number](/reference/radio/set-transmit-serial-number)