Teensy 4.1 ethernet :: https://forum.pjrc.com/threads/59776-Ethernet-and-lwip

Updated to lwIP 2.1.3, lwipopts.h modified for grblHAL iMXRT1062 driver.

put this repo in your sketchbook/libraries/

• libraries/lwip-ftpd-sd/ put this in your sketchbook/libraries/ for ftpd

Things under examples/

• teensy41_ethernet/ Paul's low-level ethernet sketch with hand-crafted packets
• etherraw/ UDP additions to Paul's low-level ethernet sketch, hand-crafted UDP packets
• lwip_dns/ demonstrate DNS queries
• lwip_echosrv/ TCP and UDP echo servers on port 7
• lwip_ftpd/ lwIP ftpd server (get/put) using SD lib and lwip-ftpd-sd lib
• lwip_httpd/ lwIP web server using SD lib and microSD
• lwip_httpd_sdfat/ lwIP web server using SdFat-beta v2 and microSD
• lwip_iperf/ TCP iperf(v2) server on port 5001
• lwip_mcast/ multicast listener, does one chirp
• lwip_perf/ various UDP/TCP client/server tests
• lwip_sntp/ NTP (UDP) poll of server (default 10 minutes)
• lwip_tftpd/ tftp server (UDP) using SD lib and microSD
• lwip_tftpd_sdfat/ tftp server (UDP) using SdFat-beta v2 and microSD
• lwip_tftpd_SPIFFS/ tftp server (UDP) using SPIFFS lib EFLASH
• lwip_webclnt/ send http GET to a web server
• lwip_websrv/ serve up embedded html and manipulate LED
• lwip_1588_timer/ read the 1588/PTP timer

The lwip lib (2.0.2) and apps are adapted from the 2016 T3.6 beta test of limited-production ethernet shield. T41 lwIP configured to use 64-byte aligned 5 transmit descriptors and 5 receive descriptors with 32-byte aligned packet buffers (1536 bytes in DTCM). See https://forum.pjrc.com/threads/34808-K66-Beta-Test?p=109161&viewfull=1#post109161

Settings

To enable ipv6, edit src/lwipopts.h and change LWIP_IPV6 to 1

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Benchmarks

                         Ethernet performance
                   T41e   1062SDK  T41USBe  T35e  T4+W5500    info
TCP xmit (mbs)       73        87      78     59         9 
TCP recv (mbs)       93        71      30     51        11  

UDP xmit (mbs)       97        97      95     85        11   blast 20 1000-byte pkts
UDP xmit (pps)   149476    137453   32331  66534     21514   blast 1000 8-byte pkts
UDP recv (mbs)       91        95      40     67         9   no-loss recv of 20 1000-byte pkts
UDP RTT (us)         94       104    1651    183       150   RTT latency of 8-byte pkts

ping RTT (us)       120       108    2000    127        82 

ePower (ma)          59       100     174    100       132  ethernet module current

  tests on 100mbs full-duplex Ether with linux box on switch
  W5500 SPI @37.5MHz, 2KB buffers

  microSD read times (seconds)  (4.2MB file, 2KB reads)
      T4 SD lib  T3.5 SdFatv1  T4.1 SdFatv2
tftp    4.76        2.2          2.2 s
http    3.6         0.9          0.9
ftp     2.8         0.6  
read()  2.76        0.26         0.19 s

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References:

• https://forum.pjrc.com/threads/60532-Teensy-4-1-Beta-Test?p=237096&viewfull=1#post237096
• https://forum.pjrc.com/threads/59776-Ethernet-and-lwip?p=230993&viewfull=1#post230993 (private)
• https://forum.pjrc.com/threads/34808-K66-Beta-Test?p=109161&viewfull=1#post109161
• https://forum.pjrc.com/threads/57701-USB-Host-Ethernet-Driver?p=218866&viewfull=1#post218866
• https://forum.pjrc.com/threads/54265-Teensy-4-testing-mbed-NXP-MXRT1050-EVKB-(600-Mhz-M7)
• https://github.com/manitou48/DUEZoo/blob/master/wizperf.txt
• https://forum.pjrc.com/threads/60857-T4-1-Ethernet-Library FNET NativeEthernet