Android Question BLE2 - Reading RSSI

Hi, I'm trying to read rssi value from a BLE device connected but the event Manager_RssiAvailable never rise. I've tried with a pair of devices and the result is the same in both cases.
I'm using a service:

Sub Service_Start (StartingIntent As Intent)
Manager.Initialize("Manager")
StartServiceAt("", DateTime.Now + 30 * DateTime.TicksPerSecond, False)
DateTime.DateFormat = "yyyy-MM-dd HH:mm:ss"
Log(DateTime.Date(DateTime.Now) & " reading rssi")
Manager.ReadRemoteRssi
End Sub

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Sub Manager_RssiAvailable (Success As Boolean, RSSI As Double)
Log(Success)
Log(RSSI)
End Sub

Have you used this functionality with success result?