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Is there reason for not using memset and memcpy instead of zeroing/copying of 16 elements of array? Like this:

DHCP_allocated_ip[0] = 0;
DHCP_allocated_ip[1] = 0;
DHCP_allocated_ip[2] = 0;
DHCP_allocated_ip[3] = 0;
DHCP_allocated_ip[4] = 0;
DHCP_allocated_ip[5] = 0;
DHCP_allocated_ip[6] = 0;
DHCP_allocated_ip[7] = 0;
DHCP_allocated_ip[8] = 0;
DHCP_allocated_ip[9] = 0;
DHCP_allocated_ip[10] = 0;
DHCP_allocated_ip[11] = 0;
DHCP_allocated_ip[12] = 0;
DHCP_allocated_ip[13] = 0;
DHCP_allocated_ip[14] = 0;
DHCP_allocated_ip[15] = 0;

SOCK_IO_NONBLOCK is not a socket flag option for socket(), as used here in loopback.c:

However, the change introduced here means that only SOCK_IO_NONBLOCK will set the socket mode to non-blocking: c9c9ef8#diff-5779d7831ac938e3f7d8cb0c0890060576acc6536afff3c010e7838367c7d9b3R172

21/05/24: A side effect of using SOCK_IO_NONBLOCK (=1) is that 'Force ARP' mode in Sn_MR2 gets enabled: https://github.com/Wiznet/io6Library/blob/master/Ethernet/socket.c#L163

When sending data using sendto function in macraw mode, the data is not sent. The send command is not set.