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Networking-for-Arduino / EthernetENC

Ethernet library for ENC28J60. This is a modern version of the UIPEthernet library. EthernetENC library is compatible with all Arduino architectures with Arduino SPI library with transactions support. Only include EthernetENC.h instead of Ethernet.h
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Fragmented Packets #13

Closed rvlietstra closed 3 years ago

rvlietstra commented 3 years ago

Hi! Thanks for all your work.

I'm trying to read a UDP packet from a device. After checking out the packet with wireshark I realized it is a fragmented packet, of about 4500 bytes. I do see packets of < 1500 bytes on the enc28j60.

I found the UIP_REASSEMBLY define in uipopt.h, I tried setting it to 1 and increasing UIP_BUFSIZE and UIP_REASS_MAXAGE but I'm still not seeing my packets.

Am I missing something ? Should this be possible ? I'm using an esp32.

Thanks!

JAndrassy commented 3 years ago

the library uses the 8 kB RAM of the ens28j60 to store received packets. 2 kB is RX buffer, 6 kB is to store packets for the application and to compose outgoing packets. the library was developed for ATmega328p with 2 kB SRAM.

so what I recommend to do for esp32, is to buy a LAN8720 PHY module and use it with native support of esp32 and esp32 Arduino core.

rvlietstra commented 3 years ago

Thank you very much for you quick reply and suggestion, I'm looking at the LAN8720. The device also supports TCP comms. Does TCP have the same restrictions ? Are there fragmented packets that would need reassembly ? Thanks!

JAndrassy commented 3 years ago

LAN8720 is only simple circuit and a connector. The esp32 has a Ethernet MAC peripheral. The esp32 SDK has a TCP/IP stack (LwIP). which handles TCP/IP for WiFi station, foe WiFi SoftAP and for the Ethernet peripheral. So you could say that the WiFi library handles Ethernet then.