Adds TCP test case

	tcpsocket_echotest
	tcpsocket_echotest_nonblock

Author: Veijo Pesonen

TESTS/netsocket/tcp/main.cpp

@@ -92,6 +92,8 @@ void greentea_teardown(const size_t passed, const size_t failed, const failure_t
 
 Case cases[] = {
     Case("Invalid endpoint rejected", test_tcpsocket_connect_invalid),
+    Case("Echo", test_tcpsocket_echotest),
+    Case("Echo non-block", test_tcpsocket_echotest_nonblock),
     Case("Echo burst", test_tcpsocket_echotest_burst),
     Case("Echo burst non-block", test_tcpsocket_echotest_burst_nonblock),
     Case("Reuse a socket", test_tcpsocket_open_close_repeat),

TESTS/netsocket/tcp/tcp_tests.h

@@ -26,6 +26,8 @@ void fill_tx_buffer_ascii(char *buff, size_t len);
  * Test cases
  */
 void test_tcpsocket_connect_invalid();
+void test_tcpsocket_echotest();
+void test_tcpsocket_echotest_nonblock();
 void test_tcpsocket_echotest_burst();
 void test_tcpsocket_echotest_burst_nonblock();
 void test_tcpsocket_endpoint_close();