WIP moving positions to new system

src/mesh/ProtobufPlugin.h

@@ -0,0 +1,72 @@
+#include "MeshPlugin.h"
+#include "Router.h"
+
+/**
+ * A base class for mesh plugins that assume that they are sending/receiving one particular protobuf based
+ * payload.  Using one particular app ID.
+ *
+ * If you are using protobufs to encode your packets (recommended) you can use this as a baseclass for your plugin
+ * and avoid a bunch of boilerplate code.
+ */
+template <class T> class ProtobufPlugin : private MeshPlugin
+{
+    const pb_msgdesc_t *fields;
+    PortNum ourPortNum;
+
+  public:
+    /** Constructor
+     * name is for debugging output
+     */
+    ProtobufPlugin(const char *_name, PortNum _ourPortNum, const pb_msgdesc_t *_fields)
+        : MeshPlugin(_name), fields(_fields), ourPortNum(_ourPortNum)
+    {
+    }
+
+  protected:
+    /**
+     * @return true if you want to receive the specified portnum
+     */
+    virtual bool wantPortnum(PortNum p) { return p == ourPortNum; }
+
+    /**
+     * Handle a received message, the data field in the message is already decoded and is provided
+     */
+    virtual bool handleReceivedProtobuf(const MeshPacket &mp, const T &decoded) = 0;
+
+    /**
+     * Return a mesh packet which has been preinited with a particular protobuf data payload and port number.
+     * You can then send this packet (after customizing any of the payload fields you might need) with
+     * service.sendToMesh()
+     */
+    MeshPacket *allocForSending(const T &payload)
+    {
+        // Update our local node info with our position (even if we don't decide to update anyone else)
+        MeshPacket *p = router->allocForSending();
+        p->decoded.which_payload = SubPacket_data_tag;
+        p->decoded.data.portnum = ourPortNum;
+
+        p->decoded.data.payload.size =
+            pb_encode_to_bytes(p->decoded.data.payload.bytes, sizeof(p->decoded.data.payload.bytes), fields, &payload);
+        return p;
+    }
+
+  private:
+    /** 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)
+    {
+        // FIXME - we currently update position data in the DB only if the message was a broadcast or destined to us
+        // it would be better to update even if the message was destined to others.
+
+        auto &p = mp.decoded.data;
+        DEBUG_MSG("Received %s from=0x%0x, id=%d, msg=%.*s\n", name, mp.from, mp.id, p.payload.size, p.payload.bytes);
+
+        T scratch;
+        if (pb_decode_from_bytes(p.payload.bytes, p.payload.size, fields, &scratch))
+            handleReceivedProtobuf(mp, scratch);
+
+        return false; // Let others look at this message also if they want
+    }
+};