Provides access to fields in a UDP header.
| Instance Variables | |
| src_port | udp.src_port -> anInteger | 
| Source Port (16-bit) | |
| dst_port | udp.dst_port-> anInteger | 
| Destination Port (16-bit) | |
| len | udp.len -> anInteger | 
| UDP length, i.e. header + payload | |
| checksum | udp.checksum -> anInteger | 
| UDP Checksum | |
| TCP Checksum | |
| payload | udp.payload -> aPayloadObject | 
| None if udp had no payload,  otherwise an object containing the packet's TCP payload | |
Nevil Brownlee
Sat, 15 Mar 14 (NZDT)