[chip-tool] Add flag to enable server interactions

Add "--advertise-operational" flag to the chip-tool's
"interactive start" command that enables server features,
including advertising operational services. This feature
is needed to test persistent subscriptions using chip-tool,
which requires that chip-tool be discoverable after the
publisher node reboots.

examples/chip-tool/commands/common/CHIPCommand.cpp

@@ -102,6 +102,7 @@ CHIP_ERROR CHIPCommand::MaybeSetUpStack()
     factoryInitParams.fabricIndependentStorage = &mDefaultStorage;
     factoryInitParams.operationalKeystore      = &mOperationalKeystore;
     factoryInitParams.opCertStore              = &mOpCertStore;
+    factoryInitParams.enableServerInteractions = NeedsOperationalAdvertising();
 
     // Init group data provider that will be used for all group keys and IPKs for the
     // chip-tool-configured fabrics. This is OK to do once since the fabric tables

examples/chip-tool/commands/common/CHIPCommand.h

@@ -123,6 +123,11 @@ class CHIPCommand : public Command
     // use member values that Shutdown will normally reset.
     virtual bool DeferInteractiveCleanup() { return false; }
 
+    // If true, the controller will be created with server capabilities enabled,
+    // such as advertising operational nodes over DNS-SD and accepting incoming
+    // CASE sessions.
+    virtual bool NeedsOperationalAdvertising() { return false; }
+
     // Execute any deferred cleanups.  Used when exiting interactive mode.
     static void ExecuteDeferredCleanups(intptr_t ignored);
 

examples/chip-tool/commands/interactive/InteractiveCommands.cpp

@@ -262,6 +262,11 @@ CHIP_ERROR InteractiveStartCommand::RunCommand()
     return CHIP_NO_ERROR;
 }
 
+bool InteractiveStartCommand::NeedsOperationalAdvertising()
+{
+    return mAdvertiseOperational.ValueOr(true);
+}
+
 bool InteractiveCommand::ParseCommand(char * command, int * status)
 {
     if (strcmp(command, kInteractiveModeStopCommand) == 0)

examples/chip-tool/commands/interactive/InteractiveCommands.h

@@ -47,10 +47,16 @@ class InteractiveStartCommand : public InteractiveCommand
 public:
     InteractiveStartCommand(Commands * commandsHandler, CredentialIssuerCommands * credsIssuerConfig) :
         InteractiveCommand("start", commandsHandler, credsIssuerConfig)
-    {}
+    {
+        AddArgument("advertise-operational", 0, 1, &mAdvertiseOperational);
+    }
 
     /////////// CHIPCommand Interface /////////
     CHIP_ERROR RunCommand() override;
+    bool NeedsOperationalAdvertising() override;
+
+private:
+    chip::Optional<bool> mAdvertiseOperational;
 };
 
 class InteractiveServerCommand : public InteractiveCommand, public WebSocketServerDelegate, public RemoteDataModelLoggerDelegate