move all hardware init to boards

main/boards/ml307_board.h

@@ -9,10 +9,10 @@ protected:
     Ml307AtModem modem_;
 
     virtual std::string GetBoardJson() override;
-    void StartModem();
+    void WaitForNetworkReady();
 
 public:
-    Ml307Board();
+    Ml307Board(gpio_num_t tx_pin, gpio_num_t rx_pin, size_t rx_buffer_size = 4096);
     virtual void Initialize() override;
     virtual void StartNetwork() override;
     virtual Http* CreateHttp() override;