diff --git a/app/src/main/java/com/duolebo/blyrobot/service/BylRobotService.kt b/app/src/main/java/com/duolebo/blyrobot/service/BylRobotService.kt
index c289f45a9aa0a4de852db927494553b422452c54..983a8f9719dd4c567532018acc018b928c5946ec 100644
--- a/app/src/main/java/com/duolebo/blyrobot/service/BylRobotService.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/service/BylRobotService.kt
@@ -27,12 +27,12 @@ class BylRobotService: Service() {
                 testCapture()
 //                screenShot()
                 count++
-                if (count > 4) {
+                if (count > 2) {
                     cancelTimer()
 //                    proc?.destroy()
                 }
             }
-        },2000, 5*1000)
+        },2000, 10*1000)
     }
 
     private fun screenShot() {
@@ -52,11 +52,14 @@ class BylRobotService: Service() {
 
     var proc: Process ?= null
     private fun testCapture() {
-        if (proc == null) {
-            Thread(Runnable {
-                proc = AdbUtil.tcpCapture("")
-            }).start()
-        }
+        proc?.destroy()
+        Thread(Runnable {
+            AdbUtil.killTcpdump()
+        }).start()
+        Thread.sleep(3000)
+        Thread(Runnable {
+            proc = AdbUtil.tcpCapture("")
+        }).start()
     }
 
     private fun cancelTimer() {
diff --git a/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt b/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
index 512321b410c15a6e9333613bf528475ba7cf192c..f73b267733792df05ec2a50d97c00e8f72b1aad3 100644
--- a/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
@@ -9,7 +9,7 @@ import java.io.InputStreamReader
 object AdbUtil {
     const val TAG = "AdbUtil"
     const val SHELL = "sh"
-    const val ROOT_SHELL = "sh"
+    const val ROOT_SHELL = "su"
     const val LINE_BREAK = "\n"
     const val EXIT = "exit"
 
@@ -174,7 +174,7 @@ object AdbUtil {
     }
 
     fun tcpCapture(tcpdump: String): Process? {
-        val captureCmd = "su\n tcpdump -p -vv -s 0 -A 'tcp dst port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420' >> /sdcard/capture.txt\nexit\n"
+        val captureCmd = "tcpdump -p -vv -s 0 -A 'tcp dst port 80 and tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420' >> /sdcard/capture.txt\n"
         val proc = getRootShell()
 
         var dos: DataOutputStream? = null
@@ -191,7 +191,59 @@ object AdbUtil {
             dos?.close()
         }
 
+        object : Thread() {
+            override fun run() {
+                val insBr = BufferedReader(InputStreamReader(proc?.inputStream))
+                try {
+                    var lineStr: String? = null
+                    do {
+                        lineStr = insBr.readLine()
+                        if (lineStr.isNullOrEmpty())
+                            break
+                        lineStr = trimLine(lineStr)
+                        Log.i(TAG, " tcpdump echo line : $lineStr")
+                    } while (true)
+                } catch (e: IOException) {
+                    e.printStackTrace()
+                } finally {
+                    try {
+                        proc?.inputStream?.close()
+                    } catch (e: IOException) {
+                        e.printStackTrace()
+                    }
+                }
+            }
+        }.start()
+
+        object : Thread() {
+            override fun run() {
+                val errBr = BufferedReader(InputStreamReader(proc?.errorStream))
+                try {
+                    var errLine: String? = null
+                    do {
+                        errLine = errBr.readLine()
+                        if (errLine.isNullOrEmpty())
+                            break
+                        errLine = trimLine(errLine)
+                        Log.i(TAG, " tcpdump error line : $errLine")
+                    } while (true)
+                } catch (e: IOException) {
+                    e.printStackTrace()
+                } finally {
+                    try {
+                        proc?.errorStream?.close()
+                    } catch (e: IOException) {
+                        e.printStackTrace()
+                    }
+                }
+            }
+        }.start()
+
         return proc
     }
 
+    fun killTcpdump() {
+        exeCmdEcho("killall tcpdump", true)
+    }
+
 }
\ No newline at end of file