Remove shitty telnet py, use tftp instead

.gitignore

@@ -1,3 +1,4 @@
 .idea
 cmake-build-debug
 CMakeLists.txt
+.build

README.md

@@ -2,11 +2,12 @@
 Some stuff about GPON Stick DFP-34X-2C2 / DFP-34G-2C2
 
 ## Set hexadecimal GPON password
+(There is a pre-built binary available in releases)
 
 - Set up a cross-compilation environment with [crosstool-ng](https://crosstool-ng.github.io/docs/)
   - Use the `ct-ng.config` in the repo, or config it as `arm-unknown-linux-uclibcgnueabi` in the samples, with CPU set to `arm9tdmi`
-- Compile libtagparamuserapi.so with command like `arm-unknown-linux-uclibcgnueabi-gcc -shared -o libtagparamuserapi.so libtagparamuserapi.c`
+- Compile the dummy libtagparamuserapi.so with command like `arm-unknown-linux-uclibcgnueabi-gcc -shared -o libtagparamuserapi.so libtagparamuserapi.c`
 - Compile the program with command like `arm-unknown-linux-uclibcgnueabi-gcc -std=c99 libtagparamuserapi.so -s -o setmac_hex setmac_hex.c`
-- Send compiled executable to the stick through telnet using the python script `telnet_send.py`
-- Telnet to the stick and run command like `/var/tmp/setmac_hex 1 2178 "f2 01 80 01 02 03 04 00 00 00"` (replace the hex string in quotes) to set GPON password
+- Set up a TFTP server in the same subnet, and get the executable on stick with commands like `cd /var/tmp && tftp -g setmac_hex -p 192.168.1.2 69`
+- Telnet to stick and run command like `/var/tmp/setmac_hex 1 2178 "f2 01 80 01 02 03 04 00 00 00"` to set GPON password
 - Run `setmac 2 2178` or `/var/tmp/setmac_hex 2 2178` to verify the result