uint32_t test = first_uint8 << 16 | second_uint8;

switch(test) {
   case 0x00170001:
        //do sth
        break;
   default:
        //printf invalid
        break;
}

switch(test) {
   case 0x170001:
        //do sth
        break;
   default:
        //printf invalid
        break;
}

uint32_t test = ((uint32_t)first_uint8) << 16 | second_uint8;