add beginnings of nodedb

src/NodeDB.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <Arduino.h>
+#include <assert.h>
+
+#include "mesh-pb-constants.h"
+#include "MeshTypes.h"
+
+class NodeDB {
+    // NodeNum provisionalNodeNum; // if we are trying to find a node num this is our current attempt
+
+    NodeNum ourNodeNum; // -1 if not yet found
+
+    // A NodeInfo for every node we've seen
+    // Eventually use a smarter datastructure
+    // HashMap<NodeNum, NodeInfo> nodes;
+    NodeInfo nodes[MAX_NUM_NODES];
+    int numNodes;
+
+    bool updateGUI; // we think the gui should definitely be redrawn
+    NodeInfo *updateGUIforNode; // if currently showing this node, we think you should update the GUI
+    
+public:
+    /// don't do mesh based algoritm for node id assignment (initially)
+    /// instead just store in flash - possibly even in the initial alpha release do this hack
+    NodeDB();
+
+    /// given a subpacket sniffed from the network, update our DB state
+    /// we updateGUI and updateGUIforNode if we think our this change is big enough for a redraw
+    void updateFrom(const MeshPacket &p);
+
+    NodeNum getNodeNum() { return ourNodeNum; }
+
+    /// if returns false, that means our node should send a DenyNodeNum response.  If true, we think the number is okay for use
+    // bool handleWantNodeNum(NodeNum n);
+
+    /* void handleDenyNodeNum(NodeNum FIXME read mesh proto docs, perhaps picking a random node num is not a great idea
+    and instead we should use a special 'im unconfigured node number' and include our desired node number in the wantnum message.  the
+    unconfigured node num would only be used while initially joining the mesh so low odds of conflicting (especially if we randomly select
+    from a small number of nodenums which can be used temporarily for this operation).  figure out what the lower level
+    mesh sw does if it does conflict?  would it be better for people who are replying with denynode num to just broadcast their denial?)
+    */
+
+private:
+    /// Find a node in our DB, return null for missing
+    NodeInfo *getNode(NodeNum n);
+
+        /// Find a node in our DB, create an empty NodeInfo if missing
+    NodeInfo *getOrCreateNode(NodeNum n);
+};
+
+extern NodeDB nodeDB;