Schema transfer optimizations for remote management over LoRa (#62)

* Implemented schema hashing to support client caching
* Added support for compression to Provisioning
* Made heatshrink embedded rather than dependency

Author: attermann

CMakeLists.txt

@@ -67,8 +67,8 @@ rns_fetch(arxtypetraits  RNS_ARXTYPETRAITS_SOURCE_DIR  https://github.com/hideak
 rns_fetch(debuglog       RNS_DEBUGLOG_SOURCE_DIR       https://github.com/hideakitai/DebugLog.git v0.8.4)
 # Crypto and microStore have no upstream tags suitable for pinning, so pin commit SHAs.
 # Refresh by running `git ls-remote <url> HEAD` and updating the hex below.
-rns_fetch(crypto         RNS_CRYPTO_SOURCE_DIR         https://github.com/attermann/Crypto.git    984dc891330986c302a86c4e312d4f5abcc28359)
-rns_fetch(microstore     RNS_MICROSTORE_SOURCE_DIR     https://github.com/attermann/microStore.git c5fb69d68229e684c7fbd17692a67ae8193b84e2)
+rns_fetch(crypto         RNS_CRYPTO_SOURCE_DIR         https://github.com/attermann/Crypto.git)
+rns_fetch(microstore     RNS_MICROSTORE_SOURCE_DIR     https://github.com/attermann/microStore.git)
 
 # -----------------------------------------------------------------------------
 # Third-party targets that don't ship CMakeLists.txt

library.json

@@ -1,6 +1,6 @@
 {
 	"name": "microReticulum",
-	"version": "0.4.1",
+	"version": "0.4.2",
 	"description": "C++ port of the Reticulum Network Stack — a cryptographic mesh networking library that runs on both 32-bit+ microcontrollers (ESP32, nRF52, LoRa boards) and native platforms (Linux, macOS), with PlatformIO and CMake build support.",
 	"keywords": "reticulum, rns, mesh, embedded, mcu, esp32, nrf52, native",
 	"repository":

library.properties

@@ -1,5 +1,5 @@
 name=microReticulum
-version=0.4.1
+version=0.4.2
 author=Chad Attermann <[email protected]>
 maintainer=Chad Attermann <[email protected]>
 sentence=C++ port of the Reticulum Network Stack

src/microReticulum/Provisioning/BuiltinNamespaces.cpp

@@ -18,7 +18,7 @@
 #include "../Reticulum.h"
 #include "../Transport.h"
 #include "../Utilities/Memory.h"
-#include "../Utilities/tlsf.h"
+#include "../Utilities/tlsf/tlsf.h"
 
 #include <set>
 #include <vector>

src/microReticulum/Provisioning/Ops.h

@@ -79,6 +79,7 @@ namespace RNS { namespace Provisioning {
 		constexpr uint16_t FirmwareVersion = 1;
 		constexpr uint16_t SchemaVersion   = 2;
 		constexpr uint16_t NeedsRebootInfo = 3;
+		constexpr uint16_t SchemaHash      = 4;	// CRC32 of serialized GetSchema response bytes
 
 		// GetCapabilities
 		constexpr uint16_t Namespaces      = 1;
@@ -103,6 +104,18 @@ namespace RNS { namespace Provisioning {
 		constexpr uint16_t FieldDefault     = 12;
 		constexpr uint16_t FieldElementSize = 13;	// BytesList: required size per entry
 		constexpr uint16_t FieldMaxCount    = 14;	// BytesList: max number of entries
+
+		// Per-request compression negotiation. Clients set ReqCompress=true
+		// in the request payload map to ask the server to compress the
+		// response. When the server complies, the response payload becomes
+		// a single-entry map { CompressedPayload: <bin> } whose value is
+		// heatshrink-compressed bytes that decompress to the original
+		// MsgPack-encoded payload. Servers always pick the smaller wire
+		// form and may send an uncompressed payload even when compression
+		// was requested (tiny payloads where the wrapper overhead exceeds
+		// the savings).
+		constexpr uint16_t ReqCompress       = 100;
+		constexpr uint16_t CompressedPayload = 101;
 	}
 
 } }