Fixed minetest reliable udp implementation (compatible to old clients)

minetest.conf.example

@@ -345,7 +345,10 @@
 # Number of emerge threads to use.  Make this field blank, or increase this number, to use multiple threads.
 # On multiprocessor systems, this will improve mapgen speed greatly, at the cost of slightly buggy caves.
 #num_emerge_threads = 1
-
+# maximum number of packets sent per send step, if you have a slow connection
+# try reducing it, but don't reduce it to a number below double of targeted
+# client number
+#max_packets_per_iteration = 1024
 #
 # Physics stuff
 #

src/client.cpp

@@ -538,7 +538,7 @@ void Client::step(float dtime)
 			writeU16(&data[53], CLIENT_PROTOCOL_VERSION_MAX);
 
 			// Send as unreliable
-			Send(0, data, false);
+			Send(1, data, false);
 		}
 
 		// Not connected, return
@@ -597,7 +597,7 @@ void Client::step(float dtime)
 					writeV3S16(&reply[2+1+6*k], *j);
 					k++;
 				}
-				m_con.Send(PEER_ID_SERVER, 1, reply, true);
+				m_con.Send(PEER_ID_SERVER, 2, reply, true);
 
 				if(i == deleted_blocks.end())
 					break;
@@ -745,7 +745,7 @@ void Client::step(float dtime)
 				reply[2] = 1;
 				writeV3S16(&reply[3], r.p);
 				// Send as reliable
-				m_con.Send(PEER_ID_SERVER, 1, reply, true);
+				m_con.Send(PEER_ID_SERVER, 2, reply, true);
 			}
 		}
 		if(num_processed_meshes > 0)
@@ -840,7 +840,7 @@ void Client::step(float dtime)
 			std::string s = os.str();
 			SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 			// Send as reliable
-			Send(0, data, true);
+			Send(1, data, true);
 		}
 	}
 }
@@ -957,7 +957,7 @@ void Client::request_media(const std::list<std::string> &file_requests)
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	Send(0, data, true);
+	Send(1, data, true);
 	infostream<<"Client: Sending media request list to server ("
 			<<file_requests.size()<<" files)"<<std::endl;
 }
@@ -970,7 +970,7 @@ void Client::received_media()
 	std::string s = os.str();
 	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
 	// Send as reliable
-	Send(0, data, true);
+	Send(1, data, true);
 	infostream<<"Client: Notifying server that we received all media"
 			<<std::endl;
 }