中继发送修改为第一次1-2s内随机发送，第二次2-3s内随机发送

app/src/main/java/com/wdkl/ncs/s433/receiver/MainActivity.java

@@ -346,8 +346,8 @@ public class MainActivity extends SerialPortActivity  {
 
             Random random = new Random();
             final String org = data;
-            int i = random.nextInt(200)+1;
-            int j=random.nextInt(200)+200;
+            int i = random.nextInt(100)+100;
+            int j=random.nextInt(100)+200;
             if(!receivedCache.containsKey(data)||receivedCache.containsKey(data)&&receivedCache.get(data)-ctime>60000) {
                 receivedCache.put(data,ctime);
                 Integer[] taskTime = new Integer[]{i,j};