Workflow

Send every other packet in reversed order.

if (wr_packet.data[0] == 0x00) {
    wr_packet.data = &wr_buffer_reversed[0];
} else {
    wr_packet.data = &wr_buffer[0];
}

Write new packet to slave.

wr_packet.address     = SLAVE_ADDRESS;
wr_packet.data_length = DATA_LENGTH;
wr_packet.data        = wr_buffer;