Simon the Pi Man
To Infinity (probably) and beyond
(A beginners Resource for the Raspberry Pi computer using the Debian distro)

since June 2012

If you are looking for info on the Raspberry Pi computer stay on this site
however
If you are looking for a good cafe in Rye in East Sussex try "Simon the Pie man" near the church.

Peer to Peer Processing Interface

I am hoping to provide a specification for an interface between Raspberry Pi machines to allow Peer to Peer Processing.

The concept behind this idea is that each Raspberry Pi machine will run an interface on either port 80 or port 443 possibly an apache or lightweight webserver to provide the interface and software on the device will provide a result via the post that will be read by the sending device.

Data would be Posted to the server either via a get or post parameter with the data in xml format, with the reply being returned again in the same xml format.

The basic XML structure is proposed as follows:-

XML Tags	Opt/Mand	Notes
<RaspberryPi Version="1">
<FromPi>
<FPiRegCode></FPiRegCode>	Mandatory	FromPi Registration Hash Code
<FPiEmail></FPiEmail>	Mandatory	FromPi Contact Email
<FPiContactNumber></FPiContactNumber>	Optional	FromPi Contact Phone
<FPiId></FPiId>	Mandatory	A Unique Id To Identify the request
<ProcStatus></ProcStatus>	Optional	Mandatory if replying success or fail
<ProcErrorMessage></ProcErrorMessage>	Optional	Mandatory if replying Description of error in data
<ProcDeliveryType></ProcDeliveryType>	Optional	Mandatory if replying data or ftp or http
<ProcDeliveryTime></ProcDeliveryTime>	Optional	Mandatory if replying 0 - 20 minutes 0=returned in <data>
<ProcDeliveryLocation> </ProcDeliveryLocation>	Optional	Mandatory if replying and delivery type = ftp or http url to pick up data
</FromPi>
<ToPi>
<TPiRegCode></TPiRegCode>	Mandatory	ToPi Registration Hash Code
<TPiEmail></TPiEmail>	Mandatory	ToPi Contact Email
<TPiContactNumber></TPiContactNumber>	Optional	ToPi Contact Phone
<FPiId></FPiId>	Optional	Mandatory if replying to processing request - taken from input xml
</ToPi>
<Package>
<PackRules></PackRules>	Optional	Processing Rules if required by ToPi service
<PackCompression><PackCompression>	Mandatory	Zip
<PackEncoding><PackEncoding>	Mandatory	Base64
<PackContent><PackContent>	Mandatory	Data to be processed by ToPi
</Package>
</Data>
</RaspberryPi>

Guidelines
Any data in the <Package><Processing> record should be first zipped and then base64 encoded, this allows any processing rules to be transferred in without causing parser issues - we suggest that any rules should be in ToPi xml format.

Any data in the <Package><Data> record should be first zipped and then base64 encoded, this allows any data whether it is csv,xml,images etc to be transferred in without causing parser issues.

Once the data has been received a reply message must be returned

The data returned should be in the same format as that being sent except that the FromPi and ToPi details are reversed.

The suggested


	The Raspberry Pi Foundation is a UK registered charity which exists to promote the study of computer science and related topics, especially at school level, and to put the fun back into learning computing. Please Note:- any mention of the Raspberry Pi computer on these pages refers to the Raspberry Pi Foundation's product, who also have trademark rights to the term 'Raspberry Pi'.