Add test interface for ice data transport

tests/peerconnection/answer.cpp

@@ -5,6 +5,17 @@
 int main(int argc, char **argv) {
   CreatePeerConnectionWithID("ws://localhost:9002", "000000");
 
+  std::cout << "Finish CreatePeerConnectionWithID" << std::endl;
+
+  std::string msg = "Hello world";
+
+  int i = 100;
+  while (i--) {
+    getchar();
+    std::cout << "Send data: [" << msg << "]" << std::endl;
+    SendData(msg.data(), msg.size());
+  }
+
   getchar();
   return 0;
 }