Updated emac greentea tests

- Improved markdown
- Set tests to fail if CTP echo server is not present

TESTS/network/emac/README.md

@@ -6,6 +6,76 @@ This document describes how to run EMAC tests. The EMAC test cases are made usin
 
 To configure a device to be a CTP echo server, you need to enable the `echo-server` setting in the `json` file of the test environment application. When a device is configured to be a CTP echo server, it starts to forward CTP messages automatically when it is switched on and continues to do so until it is switched off.
 
+## Other configuration options
+
+Default configuration files included with tests are configured for ethernet. For Wifi, set `test-ethernet` to 0 and `test-wifi` to 1. Also Wifi SSID and security options need to be configured to the configuration file. 
+
+## Example commands
+
+### CTP echo server
+
+You can use following command to build CTP echo server:
+
+`mbed test --compile -m TARGET -t GCC_ARM -v -n tests-network-emac --app-config TESTS/network/emac/template_mbed_app_echo_server.txt`
+
+Replace TARGET with the target device. After building, flash the binary to the CTP echo server device.
+
+You can verify that the CTP echo server has been started properly by making terminal connection to the device, resetting it and verifying that `echo server started successfully` is printed on the terminal. Host tests can be run when the CTP echo server is running on the Ethernet segment.
+
+For Wifi tests the CTP echo server can be also running of ethernet side as long as network configuration is such that Ethernet frames are routed between Wifi and Ethernet. 
+
+CTP echo server is sending 100 bytes long broadcast CTP Ethernet frame every 60 seconds to inform the network of its presence.
+
+### Running tests
+
+You can use following command to run tests:
+
+`mbed test --compile --run -m TARGET -t GCC_ARM -v -n tests-network-emac --app-config TESTS/network/emac/template_mbed_app.txt`
+
+Replace TARGET with the target device.
+
+## Traces
+
+Test cases have different trace levels based on how much tracing can be done without affecting the performance of the test case. Tracing is configured using `SET\_TRACE\_LEVEL' macro.
+
+For example `EMAC broadcast` test enables send, input CTP frame, success and failure traces:
+
+`SET_TRACE_LEVEL(TRACE_SEND | TRACE_ETH_FRAMES | TRACE_SUCCESS | TRACE_FAILURE);`
+
+Here is an example trace about a message that has been send to broadcast address `ff:ff:ff:ff:ff:ff` and is answered by echo server:
+
+```
+
+message sent ff:ff:ff:ff:ff:ff
+
+response: receipt number 24 LENGTH OK DATA OK BROADCAST
+
+```
+
+Here is an example trace about a message that has been send to broadcast address `ff:ff:ff:ff:ff:ff` and is not answered by echo server:
+
+```
+
+message sent ff:ff:ff:ff:ff:ff
+
+NO RESPONSE: receipt number 25
+
+```
+
+Here is an example about input message trace, message hex dump contains the first 32 bytes of the received Ethernet frame.
+
+```
+
+INP> LEN 100
+
+INP> 000000 ff ff ff ff ff ff ba 42 ed 79 11 8a 90 00
+
+INP> 00000e 00 00 02 00 ba 42 ed 79 11 8a 01 00 01 00
+
+```
+
+If you like to verify whether the echo server is receiving CTP Ethernet frames you can enable `echo-server-trace` option in the echo server configuration file. This can be used for debugging purposes. Do not run performance test like `EMAC unicast burst` with tracing enabled, since tracing affects the echo server performance.
+
 ## Test cases
 
 ### EMAC initialize

TESTS/network/emac/emac_test_broadcast.cpp

@@ -45,7 +45,9 @@ void test_emac_broadcast_cb(int opt)
 #if MBED_CONF_APP_ECHO_SERVER
     static bool echo_server_started = false;
     if (!echo_server_started) {
+#if MBED_CONF_APP_ECHO_SERVER_TRACE == 0
         SET_TRACE_LEVEL(TRACE_NONE);
+#endif
         printf("echo server started successfully\r\n\r\n");
         echo_server_started = true;
     } else {
@@ -65,7 +67,6 @@ void test_emac_broadcast_cb(int opt)
         if (++no_response_cnt > 3) {
             if (++retries > 6) {
                 printf("too many retries\r\n\r\n");
-                RESET_ERROR_FLAGS(NO_RESPONSE);
                 END_TEST_LOOP;
             } else {
                 printf("retry count %i\r\n\r\n", retries);

TESTS/network/emac/emac_util.cpp

@@ -510,13 +510,11 @@ static void worker_loop_event_cb(int event)
 {
     if (event == LINK_UP) {
         link_up = true;
-        printf("cable connected\r\n\r\n");
         link_status_semaphore.release();
     }
 
     if (event == LINK_DOWN) {
         link_up = false;
-        printf("cable disconnected\r\n\r\n");
     }
 }
 

TESTS/network/emac/main.cpp

@@ -15,12 +15,13 @@
  * limitations under the License.
  */
 
-#if !defined(MBED_CONF_APP_TEST_WIFI)      || \
-    !defined(MBED_CONF_APP_TEST_ETHERNET)  || \
-    !defined(MBED_CONF_APP_ECHO_SERVER)    || \
-    !defined(MBED_CONF_APP_WIFI_SCAN)      || \
-    !defined(MBED_CONF_APP_WIFI_SSID )     || \
-    !defined(MBED_CONF_APP_WIFI_SECURITY)  || \
+#if !defined(MBED_CONF_APP_TEST_WIFI)         || \
+    !defined(MBED_CONF_APP_TEST_ETHERNET)     || \
+    !defined(MBED_CONF_APP_ECHO_SERVER)       || \
+    !defined(MBED_CONF_APP_ECHO_SERVER_TRACE) || \
+    !defined(MBED_CONF_APP_WIFI_SCAN)         || \
+    !defined(MBED_CONF_APP_WIFI_SSID )        || \
+    !defined(MBED_CONF_APP_WIFI_SECURITY)     || \
     !defined(MBED_CONF_APP_WIFI_PASSWORD)
 #error [NOT_SUPPORTED] Requires parameters from mbed_app.json
 #endif

TESTS/network/emac/template_mbed_app.txt

@@ -12,6 +12,10 @@
             "help": "Build test to be echo server",
             "value": 0
         },
+        "echo-server-trace": {
+            "help": "Trace incoming messages on echo server",
+            "value": 0
+        },        
         "wifi-scan": {
             "help": "Scan and list access points",
             "value": 0

TESTS/network/emac/template_mbed_app_echo_server.txt

@@ -0,0 +1,41 @@
+{
+    "config": {
+        "test-ethernet": {
+            "help": "Enable ethernet testing",
+            "value": 1
+        },
+        "test-wifi": {
+            "help": "Enable wifi testing",
+            "value": 0
+        },
+        "echo-server": {
+            "help": "Build test to be echo server",
+            "value": 1
+        },
+        "echo-server-trace": {
+            "help": "Trace incoming messages on echo server",
+            "value": 0
+        },
+        "wifi-scan": {
+            "help": "Scan and list access points",
+            "value": 0
+        },
+        "wifi-ssid": {
+            "help": "WiFi SSID for network",
+            "value": "\"SSID\""
+        },
+        "wifi-security": {
+            "help": "WiFi Security",
+            "value": "NSAPI_SECURITY_WPA_WPA2"
+        },
+        "wifi-password": {
+            "help": "WiFi Password",
+            "value": "\"PASSWORD\""
+        }
+    },
+    "target_overrides": {
+        "*": {
+            "nsapi.default-stack": "TEST"
+        }
+    }
+}