Resolves #685. Resolves several issues with P25 Phase 2 channel state and call handling. (#686)

Co-authored-by: Denny <denny@denny-desktop>

src/main/java/io/github/dsheirer/message/MessageProviderModule.java

@@ -0,0 +1,83 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program is distributed in the hope that it will be useful,
+ *  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  * GNU General Public License for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.message;
+
+import io.github.dsheirer.module.Module;
+import io.github.dsheirer.sample.Listener;
+
+/**
+ * Testing module to use for injecting IMessages into a processing chain
+ */
+public class MessageProviderModule extends Module implements IMessageProvider
+{
+    private Listener<IMessage> mMessageListener;
+
+    public MessageProviderModule()
+    {
+
+    }
+
+    @Override
+    public void reset()
+    {
+
+    }
+
+    @Override
+    public void start()
+    {
+
+    }
+
+    @Override
+    public void stop()
+    {
+
+    }
+
+    @Override
+    public void dispose()
+    {
+
+    }
+
+    public void receive(IMessage message)
+    {
+        if(mMessageListener != null)
+        {
+            mMessageListener.receive(message);
+        }
+    }
+
+    @Override
+    public void setMessageListener(Listener<IMessage> listener)
+    {
+        mMessageListener = listener;
+    }
+
+    @Override
+    public void removeMessageListener()
+    {
+        mMessageListener = null;
+    }
+}