diff --git a/ChangeLog b/ChangeLog
index d41b469..c2e4c02 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2017-03-17  Björn Freise  <mcfreis@gmx.net>
+
+	SSL_write() extended to handle ctypes.Array as data
+
+	* dtls/openssl.py: SSL_write() can handle ctypes.Array data
+	* dtls/sslconnection.py: Added missing import ERR_BOTH_KEY_CERT_FILES
+	* dtls/test/simple_client.py: Added basic test client to use with dtls/test/echo_seq.py
+
 2017-03-17  Björn Freise  <mcfreis@gmx.net>
 
 	Beautified lists and maps, grouped imports for easy merges in the future - no changed functionality!
diff --git a/dtls/openssl.py b/dtls/openssl.py
index c04520f..210e3be 100644
--- a/dtls/openssl.py
+++ b/dtls/openssl.py
@@ -769,12 +769,14 @@ def SSL_read(ssl, length, buffer):
 
 def SSL_write(ssl, data):
     if isinstance(data, str):
-        str_data = data
-    elif hasattr(data, "tobytes") and callable(data.tobytes):
-        str_data = data.tobytes()
-    else:
-        str_data = str(data)
-    return _SSL_write(ssl, str_data, len(str_data))
+        str_data = data
+    elif hasattr(data, "tobytes") and callable(data.tobytes):
+        str_data = data.tobytes()
+    elif isinstance(data, ctypes.Array):
+        str_data = data.raw
+    else:
+        str_data = str(data)
+    return _SSL_write(ssl, str_data, len(str_data))
 
 def OBJ_obj2txt(asn1_object, no_name):
     buf = create_string_buffer(X509_NAME_MAXLEN)
diff --git a/dtls/sslconnection.py b/dtls/sslconnection.py
index 2b6caf2..baf665e 100644
--- a/dtls/sslconnection.py
+++ b/dtls/sslconnection.py
@@ -52,13 +52,13 @@ from weakref import proxy
 from err import openssl_error, InvalidSocketError
 from err import raise_ssl_error
 from err import SSL_ERROR_WANT_READ, SSL_ERROR_SYSCALL
-from err import ERR_COOKIE_MISMATCH, ERR_NO_CERTS
-from err import ERR_NO_CIPHER, ERR_HANDSHAKE_TIMEOUT, ERR_PORT_UNREACHABLE
-from err import ERR_READ_TIMEOUT, ERR_WRITE_TIMEOUT
-from err import ERR_BOTH_KEY_CERT_FILES_SVR
-from x509 import _X509, decode_cert
-from tlock import tlock_init
-from openssl import *
+from err import ERR_COOKIE_MISMATCH, ERR_NO_CERTS
+from err import ERR_NO_CIPHER, ERR_HANDSHAKE_TIMEOUT, ERR_PORT_UNREACHABLE
+from err import ERR_READ_TIMEOUT, ERR_WRITE_TIMEOUT
+from err import ERR_BOTH_KEY_CERT_FILES, ERR_BOTH_KEY_CERT_FILES_SVR
+from x509 import _X509, decode_cert
+from tlock import tlock_init
+from openssl import *
 from util import _Rsrc, _BIO
 
 _logger = getLogger(__name__)
diff --git a/dtls/test/echo_seq.py b/dtls/test/echo_seq.py
index 87192e6..8fd2aec 100644
--- a/dtls/test/echo_seq.py
+++ b/dtls/test/echo_seq.py
@@ -36,12 +36,13 @@ import socket
 from os import path
 from logging import basicConfig, DEBUG
 basicConfig(level=DEBUG)  # set now for dtls import code
-from dtls.sslconnection import SSLConnection
-from dtls.err import SSLError, SSL_ERROR_WANT_READ, SSL_ERROR_ZERO_RETURN
-
-def main():
-    sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-    sck.bind(("127.0.0.1", 28000))
+from dtls.sslconnection import SSLConnection
+from dtls.err import SSLError, SSL_ERROR_WANT_READ, SSL_ERROR_ZERO_RETURN
+
+
+def main():
+    sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sck.bind(("127.0.0.1", 28000))
     sck.settimeout(30)
     cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
     scn = SSLConnection(
diff --git a/dtls/test/simple_client.py b/dtls/test/simple_client.py
new file mode 100644
index 0000000..562c136
--- /dev/null
+++ b/dtls/test/simple_client.py
@@ -0,0 +1,15 @@
+from os import path
+import ssl
+from socket import socket, AF_INET, SOCK_DGRAM, SHUT_RDWR
+from logging import basicConfig, DEBUG
+basicConfig(level=DEBUG)  # set now for dtls import code
+from dtls import do_patch
+do_patch()
+
+cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
+sock = ssl.wrap_socket(socket(AF_INET, SOCK_DGRAM), cert_reqs=ssl.CERT_REQUIRED, ca_certs=path.join(cert_path, "ca-cert.pem"))
+sock.connect(('localhost', 28000))
+sock.send('Hi there')
+print sock.recv()
+sock.unwrap()
+sock.shutdown(SHUT_RDWR)