diff --git a/Dockerfiles/forContainerNet/bootserver/bootstrap_client.py b/Dockerfiles/forContainerNet/bootserver/bootstrap_client.py
index 6e34c43..25637b8 100755
--- a/Dockerfiles/forContainerNet/bootserver/bootstrap_client.py
+++ b/Dockerfiles/forContainerNet/bootserver/bootstrap_client.py
@@ -1,4 +1,5 @@
 #!/usr/bin/python
+#coding: utf-8
 import os
 import subprocess
 import requests
@@ -7,12 +8,43 @@ import requests
 BOOTSTRAP_SERVER_ADDRESS = '10.10.10.10:5555'
 
 def retrieve_config():
-    my_config = "None"
-    my_ip = subprocess.check_output("sleep 5 && echo $MY_IP", shell=True).rstrip()
-    resp = requests.get("http://%s/getmyconfig/%s"%(BOOTSTRAP_SERVER_ADDRESS, my_ip))
-    my_config = resp.text
-    if my_config != "None":
-        subprocess.check_output("node /mydir/*.js %s"%(my_config), shell=True)
-    #print("my_ip=%s and of type %s"%(my_ip,type(my_ip)))
+    my_json_config = {"verdict":"oops"}
+    my_ip = str(subprocess.check_output("echo $MY_IP", shell=True)).rstrip()
+    print("MY_IP : %s"%(my_ip))
+    while my_json_config["verdict"] != "yes":
+        try:
+            resp = requests.get("http://%s/getmyconfig/%s"%(BOOTSTRAP_SERVER_ADDRESS, my_ip), timeout=2)
+        except:
+            print("Unable to join the bootstrap server")
+        try:
+            my_json_config = resp.json()
+            print("Extracted configs [succ] : %s"%(my_json_config))
+        except:
+            print("Unable to extract configs from bootstrap server's answer")
+            print("Extracted configs [fail] : %s"%(my_json_config))
+        print("request url : ==>%s<=="%("http://%s/getmyconfig/%s"%(BOOTSTRAP_SERVER_ADDRESS, my_ip)))
+        if "verdict" in my_json_config and my_json_config["verdict"] == "yes":
+            my_config = config_json_to_string(my_json_config)
+            subprocess.check_output("node /mydir/*.js %s"%(my_config), shell=True)
+        else:
+            my_json_config = {"verdict":"oops"}
+
+def config_json_to_string(json_config):
+    config = ""
+    if "local_ip" in json_config:
+        config += "--local_ip "+json_config["local_ip"]
+    if "local_port" in json_config:
+        config += "--local_port "+str(json_config["local_port"])
+    if "local_name" in json_config:
+        config += "--local_name "+json_config["local_name"]
+    if "remote_ip" in json_config:
+        config += "--remote_ip "+json_config["remote_ip"]
+    if "remote_port" in json_config:
+        config += "--remote_port "+str(json_config["remote_port"])
+    if "remote_name" in json_config:
+        config += "--remote_name "+json_config["remote_name"]
+    if "send_period" in json_config:
+        config += "--send_period "+str(json_config["send_period"])
+    return config
 
 retrieve_config()
diff --git a/Dockerfiles/forContainerNet/device/bootstrap_client.py b/Dockerfiles/forContainerNet/device/bootstrap_client.py
index 26e5c42..25637b8 100755
--- a/Dockerfiles/forContainerNet/device/bootstrap_client.py
+++ b/Dockerfiles/forContainerNet/device/bootstrap_client.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/python
 #coding: utf-8
 import os
 import subprocess
@@ -9,8 +9,7 @@ BOOTSTRAP_SERVER_ADDRESS = '10.10.10.10:5555'
 
 def retrieve_config():
     my_json_config = {"verdict":"oops"}
-    my_ip_ = str(subprocess.check_output("echo $MY_IP", shell=True)) #subprocess returning format: b'X.X.X.X\n'
-    my_ip = my_ip_.replace("b'",'').replace("'",'').replace("\\n",'')
+    my_ip = str(subprocess.check_output("echo $MY_IP", shell=True)).rstrip()
     print("MY_IP : %s"%(my_ip))
     while my_json_config["verdict"] != "yes":
         try:
@@ -35,17 +34,17 @@ def config_json_to_string(json_config):
     if "local_ip" in json_config:
         config += "--local_ip "+json_config["local_ip"]
     if "local_port" in json_config:
-        config += "--local_port "+json_config["local_port"]
+        config += "--local_port "+str(json_config["local_port"])
     if "local_name" in json_config:
         config += "--local_name "+json_config["local_name"]
     if "remote_ip" in json_config:
         config += "--remote_ip "+json_config["remote_ip"]
     if "remote_port" in json_config:
-        config += "--remote_port "+json_config["remote_port"]
+        config += "--remote_port "+str(json_config["remote_port"])
     if "remote_name" in json_config:
         config += "--remote_name "+json_config["remote_name"]
     if "send_period" in json_config:
-        config += "--send_period "+json_config["send_period"]
+        config += "--send_period "+str(json_config["send_period"])
     return config
 
 retrieve_config()
diff --git a/Dockerfiles/forContainerNet/gateway/bootstrap_client.py b/Dockerfiles/forContainerNet/gateway/bootstrap_client.py
index 26e5c42..25637b8 100755
--- a/Dockerfiles/forContainerNet/gateway/bootstrap_client.py
+++ b/Dockerfiles/forContainerNet/gateway/bootstrap_client.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/python
 #coding: utf-8
 import os
 import subprocess
@@ -9,8 +9,7 @@ BOOTSTRAP_SERVER_ADDRESS = '10.10.10.10:5555'
 
 def retrieve_config():
     my_json_config = {"verdict":"oops"}
-    my_ip_ = str(subprocess.check_output("echo $MY_IP", shell=True)) #subprocess returning format: b'X.X.X.X\n'
-    my_ip = my_ip_.replace("b'",'').replace("'",'').replace("\\n",'')
+    my_ip = str(subprocess.check_output("echo $MY_IP", shell=True)).rstrip()
     print("MY_IP : %s"%(my_ip))
     while my_json_config["verdict"] != "yes":
         try:
@@ -35,17 +34,17 @@ def config_json_to_string(json_config):
     if "local_ip" in json_config:
         config += "--local_ip "+json_config["local_ip"]
     if "local_port" in json_config:
-        config += "--local_port "+json_config["local_port"]
+        config += "--local_port "+str(json_config["local_port"])
     if "local_name" in json_config:
         config += "--local_name "+json_config["local_name"]
     if "remote_ip" in json_config:
         config += "--remote_ip "+json_config["remote_ip"]
     if "remote_port" in json_config:
-        config += "--remote_port "+json_config["remote_port"]
+        config += "--remote_port "+str(json_config["remote_port"])
     if "remote_name" in json_config:
         config += "--remote_name "+json_config["remote_name"]
     if "send_period" in json_config:
-        config += "--send_period "+json_config["send_period"]
+        config += "--send_period "+str(json_config["send_period"])
     return config
 
 retrieve_config()
diff --git a/Dockerfiles/forContainerNet/server/bootstrap_client.py b/Dockerfiles/forContainerNet/server/bootstrap_client.py
index 26e5c42..25637b8 100755
--- a/Dockerfiles/forContainerNet/server/bootstrap_client.py
+++ b/Dockerfiles/forContainerNet/server/bootstrap_client.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/python
 #coding: utf-8
 import os
 import subprocess
@@ -9,8 +9,7 @@ BOOTSTRAP_SERVER_ADDRESS = '10.10.10.10:5555'
 
 def retrieve_config():
     my_json_config = {"verdict":"oops"}
-    my_ip_ = str(subprocess.check_output("echo $MY_IP", shell=True)) #subprocess returning format: b'X.X.X.X\n'
-    my_ip = my_ip_.replace("b'",'').replace("'",'').replace("\\n",'')
+    my_ip = str(subprocess.check_output("echo $MY_IP", shell=True)).rstrip()
     print("MY_IP : %s"%(my_ip))
     while my_json_config["verdict"] != "yes":
         try:
@@ -35,17 +34,17 @@ def config_json_to_string(json_config):
     if "local_ip" in json_config:
         config += "--local_ip "+json_config["local_ip"]
     if "local_port" in json_config:
-        config += "--local_port "+json_config["local_port"]
+        config += "--local_port "+str(json_config["local_port"])
     if "local_name" in json_config:
         config += "--local_name "+json_config["local_name"]
     if "remote_ip" in json_config:
         config += "--remote_ip "+json_config["remote_ip"]
     if "remote_port" in json_config:
-        config += "--remote_port "+json_config["remote_port"]
+        config += "--remote_port "+str(json_config["remote_port"])
     if "remote_name" in json_config:
         config += "--remote_name "+json_config["remote_name"]
     if "send_period" in json_config:
-        config += "--send_period "+json_config["send_period"]
+        config += "--send_period "+str(json_config["send_period"])
     return config
 
 retrieve_config()