type sizes use wrong assumption

[ehiverson]

I'm using a freescale ARM micro controller with:
char, signed char, and unsigned char are 8 bits;
The plain char type is unsigned by default;
short and unsigned short are 16 bits;
int and unsigned int are 32 bits;
long and unsigned long are 32 bits;
pointers are 32 bits;
long long and unsigned long long are 64 bits;
float is 32 bits;
double is 64 bits;
long double is 64 bits.

Anyway, the kBInt16 test fails because the receive method is still expecting 4 bytes. The 'i' format spec in the python struct documentation is to unpack 4 bytes. I'm confused how this test worked for anyone. With a '16' in the type name you'd think it would only be 2 bytes. The rest of the tests (except the multivalue) pass when I comment out the kBInt16 test.