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CC3120MOD: The SL_WLAN_EVENT_STA_REMOVED on the system with CC3120MOD

Guru 16800 points
Part Number: CC3120MOD

Hello,

My customers evaluate CC3120MOD under the following connection.
STM32L4+CC3120MOD (STA) ---> CC3120MOD (AP) + STM32L4
FreeRTOS is running on STM32L4 and 1052 byte data is transmitted from STA to AP every 32ms.
Now, SL_WLAN_EVENT_STA_REMOVED occurs on AP.
Let me ask you about this SL_WLAN_EVENT_STA_REMOVED.

1.AvarageDataCtrlRssi shows A0 - B0.
  Does this value correspond to two's complement?
  Thus, A0 is -80dBm and B0 is -96dBm?

2.What is the probable reason of SL_WLAN_EVENT_STA_REMOVED?
  They want to know reasons except for the weakness of the electric field strength.

3.Does this error happen after some retries in CC3120MOD?
  Or is it needed to retry the connection in application layer to recover?

4.They want to recover the connection by the trigger from AP.
  Is there any method to recover the connection from AP?
  Or, should they implement the recovery scheme in the STA?

5.How do we know what connection (e.g. 1 DSSS, 6 OFDM and so on) is selected?
  If there is the API to know the connection, please let me know.

Best Regards,
Nomo

  • Hi Nomo-san
    1. Yes they are negative numbers
    2. STA could have disconnected or stopped responding
    3. The SimpleLink Wi-Fi device lets users set the value of the maximum time before a station is
    considered inactive. After this time expires, a null data frame is sent to the station. If this frame is not
    acknowledged and no other frames are received, the station is disassociated. The default value is 60
    seconds.
    4. STA needs to reconnect
    5. This is not fixed, and there is no API to discover what it currently is.

    -Aaron