feat: add logging library

ahc/pom.xml

@@ -47,6 +47,12 @@
             <artifactId>json</artifactId>
             <version>20211205</version>
         </dependency>
+        <!--required for Logger class-->
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>2.17.1</version>
+        </dependency>
         <dependency>
             <groupId>org.dedriver</groupId>
             <artifactId>ddp</artifactId>

ahc/src/main/java/de/swingbe/ahc/Main.java

@@ -3,9 +3,14 @@ package de.swingbe.ahc;
 import org.dedriver.TxFactory;
 import org.dedriver.model.Adr;
 import org.dedriver.model.Msg;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Main {
 
+
+    private final static Logger LOG = LoggerFactory.getLogger(Main.class);
+
     /**
      * static String URL = "http://83.223.94.182";
      */
@@ -17,10 +22,14 @@ public class Main {
     static String ROUTE = "/postdata";
 
     public static void main(String[] args) {
-        System.out.println("Hello world!");
-        TxFactory.createTx().send(new Msg("uuuid", "87.263783", "52.9019052",
-                "1642802000000", "alias", "0"), new Adr(PORT, ROUTE, URL));
-        System.out.println("Done!");
+        LOG.debug("Hello world!");
+        Msg msg = new Msg("uuuid", "87.263783", "52.9019052",
+                "1642802000000", "alias", "0");
+        LOG.debug("msg: " + msg);
+        Adr adr = new Adr(PORT, ROUTE, URL);
+        LOG.debug("adr: " + adr);
+        TxFactory.createTx().send(msg, adr);
+        LOG.debug("Done!");
     }
 
 }