- make a template class for API Server

- Skip a lot of duplicate code
- add a hexDump output - might come in handy
- refactor directory names
- remove unused debugOut that was generating template errors

src/mesh/api/ServerAPI.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "StreamAPI.h"
+
+/**
+ * Provides both debug printing and, if the client starts sending protobufs to us, switches to send/receive protobufs
+ * (and starts dropping debug printing - FIXME, eventually those prints should be encapsulated in protobufs).
+ */
+template<class T>
+class ServerAPI : public StreamAPI, private concurrency::OSThread
+{
+  private:
+    T client;
+
+  public:
+    explicit ServerAPI(T &_client);
+
+    virtual ~ServerAPI();
+
+    /// override close to also shutdown the TCP link
+    virtual void close();
+
+  protected:
+    /// We override this method to prevent publishing EVENT_SERIAL_CONNECTED/DISCONNECTED for wifi links (we want the board to
+    /// stay in the POWERED state to prevent disabling wifi)
+    virtual void onConnectionChanged(bool connected) override {}
+
+    virtual int32_t runOnce() override; // Check for dropped client connections
+
+    /// Check the current underlying physical link to see if the client is currently connected
+    virtual bool checkIsConnected() override;
+};
+
+/**
+ * Listens for incoming connections and does accepts and creates instances of WiFiServerAPI as needed
+ */
+template<class T, class U>
+class APIServerPort : public U, private concurrency::OSThread
+{
+    /** The currently open port
+     *
+     * FIXME: We currently only allow one open TCP connection at a time, because we depend on the loop() call in this class to
+     * delegate to the worker.  Once coroutines are implemented we can relax this restriction.
+     */
+    T *openAPI = NULL;
+
+  public:
+    explicit APIServerPort(int port);
+
+    void init();
+
+  protected:
+    int32_t runOnce() override;
+};