linux: include IsRandom bit in Address type

Unlike what I previously thought, BlueZ does expose it. Unfortunately it
doesn't seem to respect it: the bit is not included in D-Bus paths.

Windows also supports the bit, which I hope to fix in a future commit.
Like BlueZ, it appears to ignore it when connecting to a device.

adapter_linux.go

@@ -1,5 +1,8 @@
 // +build !baremetal
 
+// Some documentation for the BlueZ D-Bus interface:
+// https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc
+
 package bluetooth
 
 import (

gap.go

@@ -54,8 +54,6 @@ type Address struct {
 	// random. Sometimes, it contains a hash.
 	// For more information:
 	// https://www.novelbits.io/bluetooth-address-privacy-ble/
-	//
-	// This field is unused under Windows and Linux.
 	IsRandom bool
 }
 

gap_linux.go

@@ -164,7 +164,10 @@ func makeScanResult(dev *device.Device1) ScanResult {
 
 	return ScanResult{
 		RSSI: dev.Properties.RSSI,
-		Address: Address{addr, false}, // the 'IsRandom' bit is not supported
+		Address: Address{
+			MAC:      addr,
+			IsRandom: dev.Properties.AddressType == "random",
+		},
 		AdvertisementPayload: &advertisementFields{
 			AdvertisementFields{
 				LocalName:    dev.Properties.Name,