如何监视远程主机上放置的远程XML，JSON或TXT文件内容？

当然，您可以从服务器读取JSON或类似的变量，执行比较并触发其他操作。或者，您可以有一个服务器端软件比较所有的东西，并发送给您的PIC简单消息（甚至UDP或TCP），它们只告诉您“改变了什么”。



      以下为原文

    Sure you can read JSON or alike variables from a server, perform comparison and trigger other actions.
 
Or, you could have a server-side software comparing all the stuff and sending to your PIC simple messages (even UDP, or TCP) that tell you simply "what changed"

好的，但是我怎么才能读取一个JSON或TXT文件，它位于一个不同的服务器端和以太网栈？有人能和这样的人分享一段代码吗？



      以下为原文

    Okay, but how could i read a JSON or TXT file located at a different server side with Ethernet Stack ?
 
Could someone please share a piece of code to something like this ?

如果服务器上有数据，客户端可以得到它。服务器客户端是关于谁将请求连接。客户机请求连接。您有很多可能的协议：TCP/IP或UDP SokKET.HTTP（WEB页）EMAIL。ftcP.PICDEM2.NET有数据吗？另一个连接是什么？另一个PIC还是PC？PICDEM2.NET有什么样的代码？它支持哪些协议？



      以下为原文

    If there is data on a Server  a client can get it.
Server an client are about who is going to request the connection.  The Client requests The connection.
You have a lot of possible protocols:
TCP/IP or UDP Sockets.
HTTP (we pages)
eMail.
FTP
ect.
 
the Picdem2.net has the Data?  What is the the Other connection? another PIC or a PC?
What sample code does the Picdem2.net have? what protocols does it support?
 

PIDDEM2.NET没有数据，它位于一个遥远的主机上。当生成一个新的TXT文件后，PICDEM2.NET将被通知，然后PICDEM2.NET将读取它并做事后处理。我知道PICDEM2.NET处理TCP，但是我知道如何处理建立连接和处理。TXT文件内容。



      以下为原文

    PICDEM2.net has not the data, it is located at a distant host.
 
I would like PICDEM2.net to be notified when a new TXT file is generated and then PICDEM2.net will read it and do things afterwards.
 
I know that PICDEM2.net handles TCP but i know how to process the establish a connection and process the TXT file content.

那么数据是在PC上（远程主机？）“远程主机”需要连接到PICDEM2.NET。这使得PICDEM2.NET成为服务器。然后，“远程主机”将传输文件数据（而不是文本文件）。你看了PICDEM2.NET示例代码吗？MLA？你在MCC支持PIC吗？



      以下为原文

    So the Data is on a PC (distant Host?)
The "distant host" would need to connect to the PICDEM2.net.  This makes the PICDEM2.net the server.  
The "distant Host" would then transfer the files data (not the text file).  Did you look at the PICDEM2.netsample code? MLA? Is you PIC supported in MCC?

我将使用GANICCTCP客户端示例作为基础，然后可能使用JSON解析器进行内容。



      以下为原文

    I'd use GenericTCPClient example as a base; then possibly use a JSON parser for the content.

NKurZman：我的PIC是18F67 J60，数据是由一个IOT板存储在一个遥远的主机。（由1和1主机定位）@ C.ZIZAG：是的，我已经使用GANICCTCPclipse发送数据到远程主机。我不应该使用GANICICTPCServer来收集来自远程主机的数据吗？如果PIC不断地请求/建立到远程主机的连接，以便检查TXT文件中的任何更改，那么这不是问题吗？以太网栈会慢得多吗？



      以下为原文

    @ NKurzman :
My PIC is 18F67J60, the datas are stored by a IOT board in a distant host.  (located by 1and1 host)
 
@ CinziaG :
Yes, i already use GenericTCPClient to send datas to the distant host.
Shouldn't i rather use GenericTCPServer to collect datas from distant host ?
 
Would that not be a problem if the PIC constantely requests / establishes a connection to distant host in order to check any change in the TXT file ?
 
Could it too much slower Ethernet stack ?

不，没有一个“服务器”是其他设备连接的东西，一个“客户端”是连接到其他PC的一个。以太网上的任何东西都是双向的，所以你的TCP客户端将能够发送和接收。有效载荷，所以…绝对不应该是个问题！



      以下为原文

    No, no
A "server" is something to which other devices connect, a "client" is the one who connects to other PCs. And anything on Ethernet is bidirectional, so your TCP Client will be able to transmit AND receive.
 
As for speed, well, consider that the transaction itself needs some 200-1000 bytes + your payload so... definitely should not be a problem!

你的远程主机是一台计算机。它的距离不是问题的答案。这里的问题是推或拉。计算机能推动数据吗？计算机会需要运行软件来推动，而你需要写它。其他的PICDEM需要查询数据。



      以下为原文

    Your Distant host is a computer.  And its distance is not relivent to the Problem.
The Question here is Push or Pull.
Can the Computer Push the Data?  Or will the PICKDem Pull it.
The Computer would need to run software to Push, and you would need to write it.
Other wise the PICDem will need to Poll for the Data 

目前，我使用GROUTICTCPclipse让PIC连接到一个遥远的主机上，并在其中推送数据。在PHP文件和get命令的帮助下，我可以制作一个TXT文件并添加数据。现在，我还需要如下：能够连接一个遥远的TXT文件，所以如果我理解得好，我应该再次去。再次使用通用TCP客户端？读取数据（池？）当TXT文件中包含的时间戳与当前的时间戳匹配时，我需要做一些任务。因此，我正在寻找如何从PIC侧收集文件，读取TXT文件中包含的时间戳，将PIC与当前的时间戳和做的事情进行比较。继续进行的方式，如NKurzman在主机端建议的那样。PHP文件是否可以与PIC建立链接（使用GANICICPCServer？）然后，PIC将能够从那里收集数据？最简单的方法是什么？到目前为止，我不知道如何开始他们中的任何一个。



      以下为原文

    At the moment, i use GenericTCPClient to let the PIC connect to a distant host and push datas in there.
With help of PHP file and GET command, i'm able to make a TXT file and add datas.
 
Now, i also need the following :
Being able to connect a distant TXT file, so if i understand well i should go again with GenericTCPClient again ?
and read the datas (pool ?) and do things.
 
 
I need to do some tasks when timestamp contained in the TXT file match the current timestamp.
 
So i was looking for how collecting datas into the file from the PIC side, reading the timestamp contained in the TXT file, compared by the PIC with current timestamp and do things.
 
Maybe other way to proceed exists, as NKurzman suggested at host side.
Could a PHP file establish a link with the PIC (with GenericTCPServer ?)
Then, PIC will be able to collect datas from there ?
 
What would be the easiest way to proceed ?
so far, iI don't know how to get started with any of them.
 
 
 
 
 
 
 
 

如果你在TCP和Ethernet上没有太多的经验，我建议你在PC（Windows或Linux）上做一些经验，然后把你的专业知识转移到PIC上，那里的东西天生就比较复杂（缺少操作系统、慢度、资源……）你在理论上也可以使用简单的T。CP套接字，或telnet协议，如果你只需要一些数据。



      以下为原文

    If you don't have much experience with "stuff" in TCP and Ethernet, I would suggest you make some experience on a PC (Windows or Linux) and then move your expertise to the PIC, where things are inherently more complicated (lack of a OS, slowness, resources...)
 
You could in theory also use a simple TCP socket, or Telnet protocol, if you just need some data.

我用sFTP做一些非常相似的事情



      以下为原文

    I use sftp for something very similar

我会看到，如果我可以在一个PC浏览器上使用IOTTX.PHP文件显示IOT TXT文件，在一个和1个服务器上工作，我将通过TCP/HTMLL从PIC获得“IOTTX.PHP文件”。PIC然后“轮询”服务器并处理结果。您可以将数据从“1”和“1”服务器推送到P。IC如果PIC有一个公共IP地址（可能是DNS）和路由器/电缆调制解调器中的一个空洞。当您打开该孔时，您可能会将传入的请求（例如端口8080）重定向到端口80上的本地PIC。



      以下为原文

    I would see if I could display the iot txt file in a PC browser using a iottxt.php file on the 1and1 server
Once that worked I would "get" the iottxt.php file from the pic via tcp/html
The pic would then "poll" the server and process the results
You could "push" the data from the 1and1 server to the pic if the pic had a public ip address ( maybe ddns ) and a hole in your router/cable modem . When you open the hole you might redirect the incoming request on for example port 8080 to your local pic on port 80.

我会看到，如果我可以在一个PC浏览器上使用IOTTX.PHP文件显示IOT TXT文件，在一个和1个服务器上工作，我将通过TCP/HTMLL从PIC获得“IOTTX.PHP文件”。PIC然后“轮询”服务器并处理ReultSyes，IOT.TXT文件可以从PC浏览器中显示出来。我可以把变量中的数据解析成一个PHP文件，用PrimeCTCPclipse。C PIC可以“获取”它们。我的最终目标是在IOT.TXT中包含的时间戳遇到一个定义的时间戳时，如CRUD或事件规划器这样做。所以我认为PIC必须“获取”或“I”。每秒钟都要说“听”那个文件，做一个时间戳与当前时间比较，以避免错过预期的事件。注意，我已经在我的Projic GraceCpCelp.c中使用传感器数据（SPI感测到PIC以太网板），用get方法将TXT文件放在1和1服务器。如果我还请求PIC每秒（调用GANICCTCPclif.c）来听一个遥远的TXT文件，那么对于18F67 J60PIC和大的带宽消耗不会有太多的工作量吗？我也在考虑一个PHP文件的不同方法，它可以在1和1服务器端进行时间戳比较，当预期的时间戳符合TXT文件中的一个时，它会通知PIC。这看起来更容易存档，但我不知道在1和1边怎么办。PIC要做的事情，我应该使用GANICCTCP服务器让1-1 PC在需要的时候向PIC发送通知吗？我不知道如何存档，一个例子将是非常受欢迎的。



      以下为原文

   

I would see if I could display the iot txt file in a PC browser using a iottxt.php file on the 1and1 server
Once that worked I would "get" the iottxt.php file from the pic via tcp/html
The pic would then "poll" the server and process the results

Yes, iot.txt file can be displayed from a PC browser, this works.
i'm also able to send parse the datas in variables into a php file, with GenericTCPClient.c Pic can "GET" them.
 
My final goal is to do things when the timestamp contained in the iot.txt meets a defined timestamp, something like a CRUD or an event planner.
 
So i think the PIC has to "GET" or i would say "listen" that file EVERY second , do a timestamp comparaison with current time in order to not miss the expected event.
 
Note, i already use in my project GenericTCPClient.c to send sensors datas ( SPI sensors attached to the PIC ethernet board ) with GET method to TXT files placed in the 1and1 server.
 
If i also request the PIC every second (call GenericTCPClient.c) to listen a distant TXT file , would not be too much workload for a 18F67J60 PIC and a large bandwidth consumption ?
 
--
 
I'm also thinking about a different approch with a PHP file that could do the timestamp comparaison at 1and1 server side and would notify the PIC when the the expected timestamp meets the one written in the TXT file.
This looks to be simpler to archive, but i don't know how at 1and1 side i could NOTIFY the PIC to do things.
Should i use GenericTCPServer to let 1and1 PC send a notification to the PIC when needed ?
I do not how to archive that and an example would be very welcomed.
 
 
 
 

在一个共享服务器上，每秒钟调用一次可能不会得到支持，即使在专用服务器或云服务器上，它也会消耗太多资源。Hyp://P.NET/Malual/Eng/Falm。FIVE-GET-CopeTr.sP.PFP可能被用来让服务器在需要时调用PIC，在用户注释中有这样做的例子，包括POST数据（您的IoT时间戳……）。这将最好地放置在从传感器接收IOT数据的1和1 PHP文件中。



      以下为原文

    A call every second would likely not be supported on a 1and1 shared server, it would consume too many resources even on a dedicated or cloud server.
================
Maybe the IOT device could report directly to the PIC and if necessary pass on the results to the 1and1 server.
================
In php the function http://php.net/manual/en/function.file-get-contents.php might be used to have the server "call" the PIC when needed, there are examples in the user notes about doing this and including POST data ( your IOT time stamp...). This would be best placed in the 1and1 php file that receives the IOT data from the sensor.