Why EtherCard library truncate Udp data to 220 bytes ?

Hello, I progress on my tunnel by Udp over Internet. I find that the load of udp packet is (hard-coded) troncated to 220. I tried to adjust size of data to buffer size, so I replace "220" by "ENC28J60::buffersize-42" ALAIK, it seems possible. Any remark welcome. PO.

Oooops, I have also to grow length type from uint8_t to uint16_t ! PO.