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lwip2 fix and update (#4729)

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* interactive example: update with option for using DHCP again after using static IP
* lwip2: avoid crash when IP address is set to 0(any) by dhcp not getting its lease renewal in due time
* lwip2: automatically remove oldest PCBs in time-wait state, limit their number
  thanks to @me-no-dev 07f4d4c241 (diff-f8258e71e25fb9985ca3799e3d8b88ecR399)
* faq: update about tcpCleanup()
* lwip2: add a macro HAS_PHY_CAPTURE=1 indicating capture facility is available
This commit is contained in:
david gauchard
2018-05-25 17:24:00 +02:00
committed by GitHub
parent 144152ce6b
commit 1a9403df1b
8 changed files with 45 additions and 6 deletions
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doc/faq/readme.rst
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@ -93,8 +93,15 @@ This error may pop up after switching between
How to clear TCP PCBs in time-wait state ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is needed with lwIP-v1.4, less needed with lwIP-v2 but timeout is still
too high.
This is not needed anymore:
PCBs in time-wait state are limited to 5 and removed when that number is
exceeded.
Ref. `lwIP-v1.4 <https://github.com/esp8266/Arduino/commit/07f4d4c241df2c552899857f39a4295164f686f2#diff-f8258e71e25fb9985ca3799e3d8b88ecR399>`__,
`lwIP-v2 <https://github.com/d-a-v/esp82xx-nonos-linklayer/commit/420960dfc0dbe07114f7364845836ac333bc84f7>`__
For reference:
Time-wait PCB state helps TCP not confusing two consecutive connections with the
same (s-ip,s-port,d-ip,d-port) when the first is already closed but still