When I use wiced_wifi_scan(), some APs would return 200 dBm as <Receive Signal Strength>.These APs are nearby and normal.In WICED SDK, this 200 is defined as <Off channel scan>. int16_t signal_strength; /**< Receive Signal Strength Indication in dBm. <-90=Very poor, >-30=Excellent, 200=Off channel scan */Why do these APs return with <Off channel scan>?How can I show these APs to my customers?Steve
The APs return with an RSSI of 200 when the AP probe response is heard on a channel that is different to the channel advertised in the probe response. Thus the RSSI value of the received packet is not indicative of the true RSSI that would have been determined had the packet been heard on the same channel as it was transmitted.The new 2.4.0 release which is currently in a BETA state addresses this problem by provided the RSSI as determined by the WLAN chip and indicating in a separate variable whether the packet was received off channel or not.