MR3020 Milestone One links

For the WR703N and MR3020 on OpenWRT, Milestone one is a stable RS232 connection.

Potential issues.

A. Software
1. Debug console may generate messages to the serial port unless a recompile of the OpenWRT kernel is done.

2. Using the USB port in the TP-link device for USB to RS232 conversion may crash.  (Why? out of memory?  debug messages jumping in? Unknown

B. Hardware
1. the Tx/Rx 4 pin header for the MR3020 delivers Vdd of about 3.01 volts measured.  
2. GPIO logic seems to be 3.3v
3. Tx/Rx logic may have configuration issues that require the Tx to have a 10K pullup to Vcc.

C. Internet Searches have provided previous hackers.

http://morethanuser.blogspot.tw/2012/10/rs232-on-openwrt-mr3020.html

http://www.wetter-board.de/board351-archivraum/board419-blitzortung-archiv/board386-blitzortung-english/56819-openwrt-on-tp-link-tl-mr3020-with-additional-hardware-mods/

http://www.youtube.com/watch?v=jFKn72oP_cM
This Youtube is just the regular login serial port... which needs to be made quite for Milestone One.

http://wiki.openwrt.org/toh/tp-link/tl-mr3020?%20%20s[]=3020
This is all the MR3020 at OpenWrt... likely you have read before.

http://wiki.openwrt.org/toh/tp-link/tl-mr3020?%20%20s[]=3020
This is the forum.openwrt.org discussing for the MR3020. Topics are far more than just the serial port use.  MUST SCAN all the pages for worthwhile info.  Pages 4 and 6 may have something useful.

http://wiki.meteoplug.com/Hardware
A weather station using an MR3020.  BTW, someone has set up a completely solar powered MR3020 as the low power requirement makes this feasible.

http://wiki.meteoplug.com/Hardware#TP-Link_TL-MR3020
More specific from meteoplug.com

http://wiki.meteoplug.com/Hardware#TP-Link_TL-MR3020
Not much help here, points to OpenWrt for specifics

[not including Russian and other foreign language entires from Google search 'OpenWrt Mr3020 rs232'

https://github.com/reefab/Projo
Seems to be a serious effort that has numerous GITHUP files, but not sure if it is on target with Milestone One

https://github.com/reefab/Projo
Has a sh script to modify  rc.common which is called 'ser2net' and claims a working opkg.

#!/bin/sh /etc/rc.common
# Ser2net daemon

START=99
STOP=99

START=10
STOP=15

start() {
        ser2net
}

stop(){
        killall ser2net
}

  
~~~~~~~~~~~~~~~~~~~~~~~~ 


http://www.instructables.com/id/How-to-set-up-OpenWRT-on-a-pocket-router-WR703N/

http://sourceforge.net/projects/wr703n/
Another project code depository.