buffer_read_u8_at
uint8_t result = buffer_read_u8_at(buffer, buffer->_position);
version = buffer_read_u8_at(packet, mark + 0);
switch (buffer_read_u8_at(packet, mark + 1)) {
switch (buffer_read_u8_at(packet, mark + 1)&AMTRELAY_TYPE_MASK) {