The NodeMCU v2 firmware for esp8266 only allows one TCP server. Usually, one will use this to serve a status page for the wireless unit. But, sometimes, maybe during development, it is desirable to also have a telnet access to the unit over WIFI to do some tweaking. Here, we achieve this by leaving a backdoor on the http port. By connecting to port 80 with telnet and enter "telnet" as the first input line, the connection is switch to a telnet service allows direct interaction with the Lua interpreter. The actual code is listed below:
esptool.py is your friend. Simply do:
./esptool.py --port /dev/ttyUSB0 write_flash 0x00000 ~/Downloads/nodemcu_float_0.9.6-dev_20150704.bin
This works for my esp-01 module. However for the NodeMCU v2 module that I have, more options need to be add to the command line:
It seemed that the proto 41 for ipv6 traffic is not forwarded to the DMZ by TP-Link 150Mbps Wireless N Router TL-WR720N. This put out the hope of setting up 6to4 in my apartment. There is a slight chance that the filtering was done by the ISP. However, I had no suitable option to test this.
As it seems, the same is true for TL-WR702N.
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