tv-casting-app fixes: saving prevValue before callback (project-chip#32843)

Author: sharadb-amazon

examples/tv-casting-app/APIs.md

@@ -158,9 +158,9 @@ client's lifecycle:
     the Matter specification's "Onboarding Payload" section for more details on
     commissioning data.
 
-    On Linux, define a function `InitCommissionableDataProvider` to initialize
-    initialize a `LinuxCommissionableDataProvider` that can provide the required
-    values to the `CastingApp`.
+    On Linux, define a function `InitCommissionableDataProvider` to initialize a
+    `LinuxCommissionableDataProvider` that can provide the required values to
+    the `CastingApp`.
 
     ```c
     CHIP_ERROR InitCommissionableDataProvider(LinuxCommissionableDataProvider & provider, LinuxDeviceOptions & options) {
@@ -917,14 +917,14 @@ On iOS refer to the following platform specific files:
 
 1. For a list of clusters, commands and attributes supported by the Matter TV
    Casting library:
-   [/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCClusterObjects.h](/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCClusterObjects.h)
+   [darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCClusterObjects.h](darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCClusterObjects.h)
 2. For the IDs and request / response types to use with the commands:
-   [/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandObjects.h](/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandObjects.h)
+   [darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandObjects.h](darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandObjects.h)
    and
-   [/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandPayloads.h](/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandPayloads.h)
+   [darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandPayloads.h](darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCCommandPayloads.h)
 3. For attribute [read operations](#read-operations) and
    [subscriptions](#subscriptions):
-   [/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCAttributeObjects.h](/darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCAttributeObjects.h)
+   [darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCAttributeObjects.h](darwin/MatterTvCastingBridge/MatterTvCastingBridge/zap-generated/MCAttributeObjects.h)
 
 ### Issuing Commands
 

examples/tv-casting-app/linux/main.cpp

@@ -106,6 +106,7 @@ CHIP_ERROR ProcessClusterCommand(int argc, char ** argv)
 
 int main(int argc, char * argv[])
 {
+    ChipLogProgress(AppServer, "chip_casting_simplified = 0"); // this file is built/run only if chip_casting_simplified = 0
     VerifyOrDie(CHIP_NO_ERROR == chip::Platform::MemoryInit());
     VerifyOrDie(CHIP_NO_ERROR == chip::DeviceLayer::PlatformMgr().InitChipStack());
 

examples/tv-casting-app/linux/simple-app.cpp

@@ -130,6 +130,7 @@ class CommonCaseDeviceServerInitParamsProvider : public ServerInitParamsProvider
 
 int main(int argc, char * argv[])
 {
+    ChipLogProgress(AppServer, "chip_casting_simplified = 1"); // this file is built/run only if chip_casting_simplified = 1
     // Create AppParameters that need to be passed to CastingApp.Initialize()
     AppParameters appParameters;
     RotatingDeviceIdUniqueIdProvider rotatingDeviceIdUniqueIdProvider;

examples/tv-casting-app/tv-casting-common/core/Attribute.h

@@ -97,16 +97,19 @@ class Attribute
                                 static_cast<ReadAttributeContext<TypeInfo> *>(__context);
                             ChipLogProgress(AppServer, "<Attribute>::Read() success");
                             Attribute<TypeInfo> * __attr = static_cast<Attribute<TypeInfo> *>(__attributeContext->mAttribute);
-                            __attr->value                = response;
                             if (__attr->hasValue)
                             {
-                                __attributeContext->mSuccessCb(__attributeContext->mClientContext,
-                                                               chip::MakeOptional(__attr->value), response);
+                                typename TypeInfo::DecodableType prevValue = __attr->value;
+                                __attr->value                              = response;
+                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::MakeOptional(prevValue),
+                                                               __attr->value);
                             }
                             else
                             {
                                 __attr->hasValue = true;
-                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::NullOptional, response);
+                                __attr->value    = response;
+                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::NullOptional,
+                                                               __attr->value);
                             }
                             delete __attributeContext;
                         },
@@ -269,17 +272,19 @@ class Attribute
                                 static_cast<SubscribeAttributeContext<TypeInfo> *>(__context);
                             ChipLogProgress(AppServer, "<Attribute>::Subscribe() success");
                             Attribute<TypeInfo> * __attr = static_cast<Attribute<TypeInfo> *>(__attributeContext->mAttribute);
-                            __attr->value                = response;
-                            // TODO: Save old value and then overwrite
                             if (__attr->hasValue)
                             {
-                                __attributeContext->mSuccessCb(__attributeContext->mClientContext,
-                                                               chip::MakeOptional(__attr->value), response);
+                                typename TypeInfo::DecodableType prevValue = __attr->value;
+                                __attr->value                              = response;
+                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::MakeOptional(prevValue),
+                                                               __attr->value);
                             }
                             else
                             {
                                 __attr->hasValue = true;
-                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::NullOptional, response);
+                                __attr->value    = response;
+                                __attributeContext->mSuccessCb(__attributeContext->mClientContext, chip::NullOptional,
+                                                               __attr->value);
                             }
                             delete __attributeContext;
                         },

examples/tv-casting-app/tv-casting-common/include/CHIPProjectAppConfig.h

@@ -58,6 +58,13 @@
 #define CHIP_CONFIG_EXAMPLE_ACCESS_CONTROL_MAX_SUBJECTS_PER_ENTRY 20
 #define CHIP_CONFIG_EXAMPLE_ACCESS_CONTROL_MAX_ENTRIES_PER_FABRIC 20
 
+/**
+ * For casting, we need to allow for more binding table entries because the Casting App can connect to many Matter Casting Players,
+ * each with many Content Apps. Each Casting Player will set 1 binding per endpoint on it. A Casting Player will have 1 endpoint for
+ * every Matter Content App installed on it + 1 endpoint representing the Casting Player + 1 endpoint representing a speaker.
+ */
+#define MATTER_BINDING_TABLE_SIZE 64
+
 // Enable some test-only interaction model APIs.
 #define CONFIG_BUILD_FOR_HOST_UNIT_TEST 1