BSP and Device Driver Development Guide
This task is reponsible for removing packets from the driver send queue and sending them to the device. The task should block waiting for an event from the
driver start function indicating that packets are waiting to be transmitted.
When the transmit task has drained the driver send queue the task should clear
the IFF_OACTIVE bit in if_flags and block until another outgoing
packet is queued.
BSP and Device Driver Development Guide
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