Fix #302, bump version to 1.5.2. update readme and changelo

Author: dhoomakethu

CHANGELOG.rst

@@ -1,3 +1,7 @@
+Version 1.5.2
+------------------------------------------------------------
+* Fix serial client `is_socket_open` method
+
 Version 1.5.1
 ------------------------------------------------------------
 * Fix device information selectors

README.rst

@@ -5,7 +5,7 @@
    :target: https://gitter.im/pymodbus_dev/Lobby
 
 .. image:: https://readthedocs.org/projects/pymodbus-n/badge/?version=latest
-   :target: http://pymodbus-n.readthedocs.io/en/latest/?badge=latest
+   :target: http://pymodbus.readthedocs.io/en/latest/?badge=latest
    :alt: Documentation Status
 
 ============================================================
@@ -15,8 +15,9 @@ Summary
 Pymodbus is a full Modbus protocol implementation using twisted for its
 asynchronous communications core.  It can also be used without any third
 party dependencies (aside from pyserial) if a more lightweight project is
-needed.  Furthermore, it should work fine under any python version > 2.3
-with a python 3.0 branch currently being maintained as well.
+needed.  Furthermore, it should work fine under any python version > 2.7
+(including python 3+)
+
 
 ============================================================
 Features
@@ -40,7 +41,7 @@ Server Features
   * TCP, UDP, Serial ASCII, Serial RTU, and Serial Binary
   * asynchronous(powered by twisted) and synchronous versions
   * Full server control context (device information, counters, etc)
-  * A number of backing contexts (database, redis, a slave device)
+  * A number of backing contexts (database, redis, sqlite, a slave device)
 
 ============================================================
 Use Cases
@@ -130,6 +131,7 @@ I get time doing such tasks as:
   * Architecture documentation
   * Functional testing against any reference I can find
   * The remaining edges of the protocol (that I think no one uses)
+  * Asynchronous clients with support to tornado , asyncio  
 
 ------------------------------------------------------------
 Development Instructions

pymodbus/client/sync.py

@@ -529,7 +529,10 @@ def _recv(self, size):
 
     def is_socket_open(self):
         if self.socket:
-            return self.socket.is_open()
+            if hasattr(self.socket, "is_open"):
+                return self.socket.is_open
+            else:
+                return self.socket.isOpen()
         return False
 
     def __str__(self):

pymodbus/version.py

@@ -41,7 +41,7 @@ def __str__(self):
         return '[%s, version %s]' % (self.package, self.short())
 
 
-version = Version('pymodbus', 1, 5, 1)
+version = Version('pymodbus', 1, 5, 2)
 
 
 version.__name__ = 'pymodbus'  # fix epydoc error