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--- network_protocol_programming_lab:channel_sensing [2020/05/25 08:25] – rathke
+++ network_protocol_programming_lab:channel_sensing [2021/04/19 12:41] (current) – [Requirements] rathke
@@ Line 7: / Line 7: @@
 This task requires
-  * a ready BeagleBone Black equipped with the CC1200
+  * a ready BeagleBone Black equipped with the CC1200.
-  * one TI Development Kit for the CC1200
+  * 4C attached to a second BeagleBone Black equipped with the CC1200.
-  * Smart RF Studio.
+===== Tasks  =====
+  * the programming is done by extending the source files from the previous lesson [[network_protocol_programming_lab:change_frequency|Exercise: Changing the frequency]].
+  * Extend your program by a function that measures the RSSI prior to packet reception. A packet should only be received, if a valid RSSI from the sende is detected. What means a valid RSSI ?
+  * Don't forger to disable preamble recognition at the receiver.
+  * For testing, start your program.
+  * Use SmartRF Studio to transmit packets at the RF frequency (do not forget to change the symbol rate and preamble count in SmartRF Studio).
+  * Your program should recognize a valid RSSI and start receiving packets.
+  * Now, change RF to a frequency the receiver is not using. Stopping and restarting the transmitter ist not necessary.
+  * At the receiver, the BeagleBone Black, you should now measure no valid RSSI and therefore no packet will be received.
+  * Now, change the frequency of SmartRF Studio back to your selected frequency.
+  * Now, you should be able to receive the packets again.
+===== Hints  =====
+  * To determine a valid RSSI caused by the sender. Measure the RSSI of the noise level in a training phase at the beginning of your program. Make sure, that the sender is not transmit anything.