Need Embedded Network Module HTTP data acquisition program

[Akaashath]

Hi all,

I need HTTP-based protocol to implement data acquisition programs, the use of embedded network module for serial to Ethernet data conversion, using the data acquisition board will be encapsulated into HTTP packets. I need this program for flexibility to achieve simple; use of distributed architecture, collecting, high efficiency, suitable for large amounts of data collection. Please provide me. Thanks in advance.

[Modifier]

HTTP protocol is a TCP-based application layer protocol implementation, which is the exchange of reliable data on the Internet an important foundation. To achieve the HTTP protocol must be based on TCP / IP protocol stack, based on the use of embedded network module can be easily achieved TCP / IP protocol stack functionality. A realization of the use of embedded network module HTTP-based data acquisition program. Check and reply.

[opaper]

The most critical part of the acquisition board and the network module. Today's most commonly used instrument of communication interface is a 485 serial interface, acquisition board and instrumentation devices typically connected via 485 bus, collecting the use of microcontroller development boards to achieve the next-bit machines and equipment instrument of communication, using master-slave method of data collection needs, and through the 485 sent to the network module, network module before the data acquisition board to issue the serial data, using built-in TCP / IP protocol stack to achieve serial data to the Ethernet data conversion, network module through the network cable, switches, and collection of server connection.

[Reegan]

Acquisition board is to achieve a place HTTP application layer protocol, as long as the data acquisition board issued in line with HTTP protocol via the network module transformed into a legitimate HTTP requests , then the Web server can use any server-side dynamic web technologies like CGI, ASP, JSP, PHP, ASP.Net, etc.for data processing and preservation. Check that and reply.

[Zecho]

Acquisition board and instrumentation to collect data other than the master-slave communication, the most important task is to collect the data for the HTTP protocol encapsulation of data packets, that is to achieve a simplified SCM HTTP protocol, able to complete the basic data can be interactive features . in the international standard, there are two HTTP protocol standard documents: RFC1945, and RFC2616 [5]. The two versions of the HTTP protocol biggest difference is that The former does not support for maintaining connections, the provisions of each of the HTTP request and response should be closed after the TCP connection, which supports persistent connections, which means that you can open a TCP connection for multiple request / response, greatly improved performance. Best of luck.

[Reegan]

I will give you the following specific examples through a HTTP protocol packet format for implementation.

GET / mycom2http123/test123.aspx HTTP/1.1CRLF
Host: 127.0.0.1CRLF
Content-Length: 86CRLF
Connection: Keep-AliveCRLF
CRLF
000000C8420000C8000C8420000C8420000C8420000C8420000C8420000C8420000C84251AD

Through the tools of data intercepted with 16 hexadecimal display as follows:

00000000:47 45 54 20 2F 63 6F 6D 32 68 74 74 70 2F 74 65 GET / mycom2http123/te123

00000010:73 74 2E 61 73 70 78 20 48 54 54 50 2F 31 2E 31 test123.aspx HTTP/1.1