Broadcast

To transmit to all devices:

When using Transparent mode, set DH to all 0's and DL to 0xFFFF.
For API mode set 0x000000000000FFFF in the 64-bit destination address field of the API frame.

By default, Ethernet bridging uses broadcasts and no retransmissions occur. If you send packets via TCP, then the TCP protocol provides the retransmissions as needed to provide for reliability. UDP packets may be lost when BA is set to a broadcast address.