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--- en:mervis-ide:30-communication-protocols:10-sscp [2017/06/14 10:24]
m.chlupac created
+++ en:mervis-ide:30-communication-protocols:10-sscp [2017/06/30 08:32]
m.chlupac ↷ Page moved from en:mervis-ide:communication-protocols:10-sscp to en:mervis-ide:30-communication-protocols:10-sscp
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 ====== SSCP protocol ======
-{{:cs:mervis-ide:sharkprotocolspecification_user_2017_05_30.pdf|SSCP description}}.
+Mervis controllers support full configuration and communication via SSCP protocol. Detail description of this protocol is available in: {{:cs:mervis-ide:sharkprotocolspecification_user_2017_05_30.pdf|SSCP description}}.
+===== Basic features =====
+  * Protocol is defined on application layer
+      * TCP and serial bus implementations are currently available. UDP is used for autodetection and configuration.
+  * Simple structure of communicated data packets
+      * Easy to calculate packet size from header.
+      * Extra headers and suffixes can be added for different communication layers - inner structure stays untouched.
+      * Each data packet (except broadcast packets) carries information about destination address (8 bit slave ID). Only controller with that address is expected to respond.
+  * SSCP can be used for any and all communication tasks
+      * Communication of statistics, configuration, PLC detection, communication of values, remote debugging etc.
+  * Communication buffer size can be negotiated by client
+  * Client authentication is required.
+  * [[en:mervis-proxy:00-start|Mervis Proxy]] support.
+  * Protocol versioning is supported. Newer version is backward compatible with previous version but usage of deprecated and obsolote methods is not recommended.
+===== Communication of Values =====
+  * SSCP protocol supports long memory blocks. If the size of the buffer is not sufficient - multiple reads can be made and atomicity of the operation is guaranteed.
+  * Every variable is identified by its communication ID.
+  * Value is communicated as a block of memory. Offset and length can be used to read part of the larger data structure (array, struct, function block, ...)
+      * Memory data layout follows standard rules of data alignment (1-8 bytes)