switch to lwip_536; minor fixes

Makefile

@@ -235,7 +235,7 @@ MODULES		+= $(foreach sdir,$(LIBRARIES_DIR),$(wildcard $(sdir)/*))
 EXTRA_INCDIR 	= include .
 
 # libraries used in this project, mainly provided by the SDK
-LIBS = c gcc hal phy pp net80211 wpa main lwip crypto
+LIBS = c gcc hal phy pp net80211 wpa main lwip_536 crypto
 
 # compiler flags using during compilation of source files
 CFLAGS	+= -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \

README.md

@@ -162,6 +162,12 @@ Note that multiple connections to port 23 and 2323 can be made simultaneously. E
 intermix characters received on all these connections onto the serial TX and it will
 broadcast incoming characters from the serial RX to all connections. Use with caution!
 
+If you are using esp-link to connect to the console of a linux system, such as an rPi, you
+will most likely see what you typed being echoed twice. If you are on a linux system use
+telnet and issue a `mode char` command (in telnet, hit the escape char `^]` and type `mode
+char` at the prompt). If you are using putty on Windows, open the connection settings and
+in the terminal settings set both `local echo` and `local line editing` to `off`.
+
 Contact
 -------
 

UC-FLASHING.md

@@ -10,7 +10,7 @@ broadcast incoming characters from the serial RX to all connections. Use with ca
 
 ### Flashing an attached AVR/Arduino
 
-There are three options for reprogramming an attached AVR/Arduino microcontroller:
+There are multiple options for reprogramming an attached AVR/Arduino microcontroller:
 
 - Use avrdude and point it at port 23 of esp-link. Esp-link automatically detects the programming
   sequence and issues a reset to the AVR.
@@ -18,6 +18,8 @@ There are three options for reprogramming an attached AVR/Arduino microcontrolle
   autodectection is not used and the reset happens because port 2323 is used
 - Use curl or a similar tool to HTTP POST the firmware to esp-link. This uses the built-in
   programmer, which only works for AVRs/Arduinos with the optiboot bootloader (which is std).
+- Use some serial port forwarding software, such as com2com, or hwvsp (you have to uncheck
+  nvt in the settings when using the latter).
 
 To reprogram an Arduino / AVR microcontroller by pointing avrdude at port 23 or 2323 you
 specify a serial port of the form `net:esp-link:23` in avrdude's -P option, where