make pinger wait for responses

pinger/src/main/groovy/com/muwire/pinger/Pinger.groovy

@@ -7,6 +7,8 @@ import java.nio.file.Path
 
 import net.i2p.client.I2PClientFactory
 import net.i2p.client.I2PSession
+import net.i2p.client.I2PSessionMuxedListener
+import net.i2p.client.datagram.I2PDatagramDissector
 import net.i2p.client.datagram.I2PDatagramMaker
 import net.i2p.data.Destination
 
@@ -32,11 +34,52 @@ public class Pinger {
         
         def session = i2pClient.createSession(bais, props)
         
+		session.addMuxedSessionListener(new Listener(),
+			I2PSession.PROTO_DATAGRAM, I2PSession.PORT_ANY)
         session.connect()
-        println "connected"
         
         def maker = new I2PDatagramMaker(session)
         payload = maker.makeI2PDatagram(payload)
         session.sendMessage(target, payload, I2PSession.PROTO_DATAGRAM, 0, 0)
+		println "Sent message, going to sleep"
+		Thread.sleep(Integer.MAX_VALUE)
     }
+	
+	static class Listener implements I2PSessionMuxedListener {
+
+		@Override
+		public void messageAvailable(I2PSession session, int msgId, long size) {
+			
+		}
+
+		@Override
+		public void messageAvailable(I2PSession session, int msgId, long size, int proto, int fromport, int toport) {
+			def payload = session.receiveMessage(msgId)
+			def dissector = new I2PDatagramDissector()
+			try {
+				dissector.loadI2PDatagram(payload)
+				def sender = dissector.getSender().toBase32()
+				payload = new String(dissector.getPayload())
+				println "From $sender received $payload"
+			} catch (Exception e) {
+				e.printStackTrace()
+			}
+		}
+
+		@Override
+		public void reportAbuse(I2PSession session, int severity) {
+			println "abuse $severity"
+		}
+
+		@Override
+		public void disconnected(I2PSession session) {
+			println "disconnected"
+		}
+
+		@Override
+		public void errorOccurred(I2PSession session, String message, Throwable error) {
+			println "Error $message $error"
+		}
+		
+	}
 }