Move text message handling into the new plugin system

src/plugins/TextMessagePlugin.cpp

@@ -0,0 +1,28 @@
+#include "configuration.h"
+#include "TextMessagePlugin.h"
+#include "NodeDB.h"
+#include "PowerFSM.h"
+
+TextMessagePlugin textMessagePlugin;
+
+bool TextMessagePlugin::handleReceived(const MeshPacket &mp)
+{
+    auto &p = mp.decoded.data;
+    DEBUG_MSG("Received text msg from=0x%0x, id=%d, msg=%.*s\n", mp.from, mp.id, p.payload.size, p.payload.bytes);
+
+    // We only store/display messages destined for us.
+    // Keep a copy of the most recent text message.
+    devicestate.rx_text_message = mp;
+    devicestate.has_rx_text_message = true;
+
+    powerFSM.trigger(EVENT_RECEIVED_TEXT_MSG);
+    notifyObservers(&mp);
+
+    // This is going into the wifidev feature branch
+    // Only update the WebUI if WiFi is enabled
+    //#if WiFi_MODE != 0
+    //  notifyWebUI();
+    //#endif
+
+    return false; // Let others look at this message also if they want
+}

src/plugins/TextMessagePlugin.h

@@ -0,0 +1,28 @@
+#include "MeshPlugin.h"
+#include "Observer.h"
+
+/**
+ * Text message handling for meshtastic - draws on the OLED display the most recent received message
+ */
+class TextMessagePlugin : public MeshPlugin, public Observable<const MeshPacket *>
+{
+  public:
+
+    /** Constructor
+     * name is for debugging output
+     */
+    TextMessagePlugin() : MeshPlugin("text") {}
+
+    /**
+     * @return true if you want to receive the specified portnum
+     */
+    virtual bool wantPortnum(PortNum p) { return p == PortNum_TEXT_MESSAGE_APP; }
+
+    /** Called to handle a particular incoming message
+
+    @return true if you've guaranteed you've handled this message and no other handlers should be considered for it
+    */
+    virtual bool handleReceived(const MeshPacket &mp);
+};
+
+extern TextMessagePlugin textMessagePlugin;