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How to Demultiplex Management Frames
NetDev_MgmtDemux() is called by μC/TCP-IP’s Receive task after the device’s receive function has returned a management frame. NetDev_MgmtDemux() requires that the device driver analyses management frames received and it must performs all necessary operations. It performs the following actions:
- Determine if the management frame is a response of a previous management command sent or if it is a management frame which require the driver to update driver’s state.
- If the management frame is a response, the device’s Wireless Manager must be signaled using the function pointer NetWiFiMgr_Signal(). No other steps are required in that case.
- If the management frame is a state update, the driver should update device’s data or interface’s link state or perform transmit complete operations.
- NetDev_MgmtDemux() sets p_err to NET_DEV_ERR_NONE and return from the demultiplex function.
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If the management frame is only used within NetDev_MgmtDemux() (i.e., device’s Wireless Manager not signaled), the network buffer must be freed by calling NetBuf_Free(). |