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a Tutorial on CLOUD coding with NodeMCU |
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Posted by: smartarduino - 05-28-2015, 08:23 AM - Forum: NodeMcu Cloud Coding
- No Replies
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Hi, guys,
how do you imagine coding on the CLOUD with NodeMCU?
It's realy cool!
This is a tutorial on how to code with CLOUD coding
The "CLOUD coding protocal" is posted at:
http://bbs.smartarduino.com/showthread.php?tid=2
Principle:
NodeMCU connects to internet as a node. A "yun.lua" runned in NodeMCU. a TCP client was established to connect to the the cload server:198.199.94.16 at port 7500.
The lua source code was edited in the browser at http://cloud.doit.am. Click "run" button, the source code would be transferred to the NodeMCU.
The "yun.lua" running in the NodeMCU recieving the souce code file, saved it as a lua file, compiled it and ran the lc file.
Three lua files are listed here to realize the CLOUD coding function.
The steps:
1, these files should be downloaded to NodeMCU first: init.lua,sta.lua,yun.lua
Tips: the Cloud server and the NodeMCU are touched together with the deviceID. Such as "doitCar" here. You can name it as you wish.
init.lua:
Code:
print("\n")
print("ESP8266 Started")
local exefile="sta"
local luaFile = {exefile..".lua","yun.lua"}
for i, f in ipairs(luaFile) do
if file.open(f) then
file.close()
print("Compile File:"..f)
node.compile(f)
print("Remove File:"..f)
file.remove(f)
end
end
if file.open(exefile..".lc") then
dofile(exefile..".lc")
else
print(exefile..".lc not exist")
end
exefile=nil;luaFile = nil
collectgarbage()
sta.lua:
Code:
print("Ready to Set up wifi mode")
wifi.setmode(wifi.STATION)
local ssid = "MERCURY_1013"
local psw = "123456789"
print("Conneting to "..ssid)
wifi.sta.config(ssid,psw)--ssid and password
wifi.sta.connect()
local cnt = 0
gpio.mode(0,gpio.OUTPUT);
tmr.alarm(3, 1000, 1, function()
if (wifi.sta.getip() == nil) and (cnt < 20) then
print("->")
cnt = cnt + 1
if cnt % 2 ==1 then
gpio.write(0,gpio.HIGH);
else
gpio.write(0,gpio.LOW);
end
else
tmr.stop(3)
if (cnt < 20) then
print("Config done, IP is "..wifi.sta.getip())
cnt = nil;ssid=nil;psw=nil;
collectgarbage();
if file.open("yun.lc") then
dofile("yun.lc")
else
print("yun.lc not exist")
end
else
print("Wifi setup time more than 20s, Pls verify\r\nssid:"..ssid.." psw:"..psw.."\r\nThen re-download the file.")
cnt=cnt+1;
tmr.alarm(1, 300, 1, function()
if cnt % 2 ==1 then
gpio.write(0,gpio.HIGH);
else
gpio.write(0,gpio.LOW);
end
end)
end
end
end)
yun.lua:
Code:
--yun coding demo
--Created @ 2015/05/27 by Doit Studio
--Modified: null
--http://www.doit.am/
--http://www.smartarduino.com/
--http://szdoit.taobao.com/
--bbs: bbs.doit.am
print("Start yun")
gpio.mode(0,gpio.OUTPUT);--LED Light on
gpio.write(0,gpio.LOW);
local deviceID = "doitCar"
local timeTickCnt = 0
local fileName = "yunRemote"
local conn;
local flagClientTcpConnected=false;
print("Start TCP Client");
tmr.alarm(3, 5000, 1, function()
if flagClientTcpConnected==true then
timeTickCnt = timeTickCnt + 1;
if timeTickCnt>=60 then --every 300 seconds send "cmd=keep\r\n" to server
timeTickCnt = 0;
conn:send("cmd=keep\r\n");
end
elseif flagClientTcpConnected==false then
print("Try connect Server");
conn=net.createConnection(net.TCP, false)
conn:connect(7500,"198.199.94.16");
conn:on("connection",function(c)
print("TCPClient:conneted to server");
conn:send("cmd=subscribe&topic="..deviceID.."\r\n");
flagClientTcpConnected = true;timeTickCnt = 0;
end) --connection
conn:on("disconnection",function(c)
flagClientTcpConnected = false;
conn=nil;collectgarbage();
end) --disconnection
conn:on("receive", function(conn, m)
if string.sub(m,1,5)=="__B__" then
file.remove(fileName..".lua")
file.open(fileName..".lua", "w" )
conn:send("cmd=next\r\n");--start fetching prog file
elseif string.sub(m,1,5)=="__E__" then --finish fetching
file.close()
collectgarbage();
node.compile(fileName..".lua");
file.remove(fileName..".lua");
dofile(fileName..".lc")
else --the file context
print("Recieve:"..m)
file.writeline(m);
conn:send("cmd=next\r\n");--continue fetching
end
collectgarbage();
end)--receive
end
end)
2. Open the website:http://cloud.doit.am.
3. Type a device ID, such as "doitCar" here.
4. When you are in, typing the codes as follows:
Code:
print("start flash led")
cnt = 10
while cnt>0 do
gpio.write(0,gpio.LOW)
tmr.delay(1000*1000) --1second
gpio.write(0,gpio.HIGH)
tmr.delay(1000*1000)--1second
cnt = cnt - 1;
end
print("yun demo finish!")
5. Press "run".
If everything goes well, you will notice the led flashing in 1 sencond
Enjoy it.
Here is the programm log.
Code:
NodeMCU 0.9.6 build 20150406 powered by Lua 5.1.4
ESP8266 Started
Hard Restart 2015年5月27日 17:15:26
Ready to Set up wifi mode
Conneting to MERCURY_1013
> ->
->
->
Config done, IP is 192.168.1.116
Start yun
Start TCP Client
Try connect Server
TCPClient:conneted to server
Recieve:print("start flash led")
cnt = 10
while cnt>0 do
gpio.write(0,gpio.LOW)
tmr.delay(1000*1000) --1second
gpio.write(0,gpio.HIGH)
tmr.delay(1000*1000)--1second
cnt = cnt - 1;
end
print("yun demo finish!")
start flash led
yun demo finish!
A chinese tutorial can be found here:
http://bbs.doit.am/forum.php?mod=viewthread&tid=46&page=1&extra=#pid47
You can get the tutorial code at github:
https://github.com/SmartArduino/COULD-coding-with-NodeMCU
      
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CLOUD coding protocal |
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Posted by: smartarduino - 05-28-2015, 08:20 AM - Forum: NodeMcu Cloud Coding
- No Replies
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Principle:
Lua source code edited on the cloud is transferred to the node and runned on the node.
The node communicates with server via TCP protocal(Server IP: [email protected]:7500）
Here is protocal:
Code:
1, Define your node's name (such as "doitCar")
cmd=subscribe&topic=doitCar\r\n
Code:
2, When a lua file is edited and needed to be downloaded at the node:
2.1 Server sends [color=#ff9933]"__B__"[/color] to the node. the node open a file,and send [color=#ff9933]"cmd=next\r\n"[/color] to server as responce string. Once the node recievs "__B__", it should know that a new source code file is prepared to be transferred.
2.2 Server will send the source code in sevaral package. The node recieves and store the package one by one, and sends [color=#ff66ff]"cmd=next\r\n"[/color] to the server every package.
2.3 Server send [color=#ff9933]"__E__"[/color] when the transfering is finished. The node recieves the finishing string, saves the source code, closes the opened file. compiles the file,and dofile it.
Code:
3, Send [color=#ff9933]"cmd=keep\r\n"[/color] every 3 minitus to keep the tcp link alive.
The CLOUD coding website:http://cloud.doit.am
A tutorial was posted at here:http://bbs.smartarduino.com/showthread.php?tid=3&pid=3#pid3 that's really simple and easy.
Have fun!
A chinese protocal can be found here:
http://bbs.doit.am/forum.php?mod=viewthread&tid=44&extra=page%3D1
You can get the tutorial code at github:
https://github.com/SmartArduino/COULD-coding-with-NodeMCU
    
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