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README.md

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+# nodemcu_tftpd
+
+  A simple nodemcu lua tftp server to upload your nodemcu lua files over the Wifi connection
+
+## Installation
+
+  Upload the with f.e. lualoader
+  then compile using
+
+```lua
+node.compile("tftpd.lua")
+```
+ and optionally remove the lua file to save some flash space
+
+```lua
+file.remove("tftpd.lua")
+```
+
+## Start
+
+  To run the tftp server:
+
+```lua
+dofile("tftpd.lc")
+```
+
+  To auto-start the tftp server add the line above to your init.lua

tftpd.lua

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+_tblk=0
+s=net.createServer(net.UDP)
+s:on("receive",function(c,r) 
+  local op=string.byte(r,2)
+  if(op==2)then
+    local fn=string.match(r,"..(%Z+)")
+    uart.write(0,"TFTP '"..fn.."': ")
+    _tblk=1
+    file.open(fn,"w")
+    c:send("\0\4\0\0")
+  elseif(op==3)then
+    local b=string.byte(r,3)*256+string.byte(r,4)
+    local sz=string.len(r)-4
+    uart.write(0,"#")
+    if(b==_tblk)then
+      c:send("\0\4"..string.sub(r,3,4))
+      _tblk=b+1
+      file.write(string.sub(r,5))
+    end
+    if(sz~=512)then
+      print(" done!")
+      file.close()
+    end
+    collectgarbage();
+  end
+end) 
+s:listen(69)
+print("TFTP server started")