Error when transferring high amount of data

[Svenson12]

With Profinet up to 1440 bytes of data can be transferred.
But due to an invalid data type of buffer_length in struct pf_ppm_t, this size cannot be achieved.
When the Ethernet packet to be transferred becomes bigger than ~255 byte, the code fails and just a fragment of the packet is transferred.
The data type of this variable should be changed from uint8_t to uint16_t.

p-net/src/pf_types.h

Line 1116 in 95a267c

uint8_t buffer_length;

Can you confirm?

[pyhys]

See pull request #35

[pyhys]

Thanks for the detailed bug report! Now fixed.