Do not use compression with DTLS
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index c6bcf25..df300a4 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -1444,6 +1444,11 @@
     }
 #endif
 
+    /* See comments in ssl_write_client_hello() */
+#if defined(POLARSSL_SSL_PROTO_DTLS)
+    if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
+        ssl->session_negotiate->compression = SSL_COMPRESS_NULL;
+#endif
     /*
      * Check the extension length
      */