Tsn evaluation

coupler/cli.h

@@ -196,5 +196,11 @@ void handleCLI(int argc, char **argv) {
       }
 
     printf("Heart beat check=%d\n", ENABLE_HEART_BEAT_CHECK);
+
+    // update current measurement mode
+    const char* s = getenv("CURRENT_GPIO_MODE");
+    if (s != NULL) CURRENT_GPIO_MODE = 1;
+    printf("GPIO measurement mode = %d\n", CURRENT_GPIO_MODE);
 }
 
+

coupler/keep_alive.h

@@ -17,6 +17,12 @@ const int STATE_NO_INITIAL_HEART_BEAT = 2;
 // number of times the coupler was in SAFE mode 
 static unsigned int SAFE_MODE_STATE_COUNTER = 0;
 
+// the current GPI state (used for debuging)
+static unsigned int CURRENT_GPIO_STATE = 0;
+
+// variable representing the measurement over GPIO
+static unsigned int CURRENT_GPIO_MODE = 0;
+
 // the heart beat interval (in ms)
 const int DEFAULT_HEART_BEAT_INTERVAL = 250;
 static int HEART_BEAT_INTERVAL = DEFAULT_HEART_BEAT_INTERVAL;

coupler/keep_alive_subscriber.h

@@ -8,15 +8,65 @@
 #include <stdio.h>
 #include <signal.h>
 #include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/gpio.h>
 
 UA_NodeId connectionIdentifier;
 UA_NodeId readerGroupIdentifier;
 UA_NodeId readerIdentifier;
-
 UA_DataSetReaderConfig readerConfig;
 
 static void fillTestDataSetMetaData(UA_DataSetMetaDataType *pMetaData);
 
+static int setGPIO() {
+  /*
+   * Set GPIO state (useful for debuging with logical analyzer
+   */
+  int fd;
+  struct gpiohandle_request led;
+  struct gpiohandle_data data;
+
+  /* Schema for STMP15x-Shield
+   * GND         : pin 2
+   * Channel 0   : pin 9
+   */
+
+  fd = open("/dev/gpiochip1", O_RDWR);
+  if(fd < 0) {
+    perror("Error opening gpiochip");
+    return -1;
+  }
+
+  /* Setup GPIO to output */
+  led.flags = GPIOHANDLE_REQUEST_OUTPUT;
+  strcpy(led.consumer_label, "LED");
+  memset(led.default_values, 0, sizeof(led.default_values));
+  led.lines = 1;
+  led.lineoffsets[0] = 7;
+
+  if(ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &led) < 0) {
+    perror("Error setting GPIO to output");
+    close(fd);
+    return -1;
+  }
+
+  // revert previous state
+  if (CURRENT_GPIO_STATE) CURRENT_GPIO_STATE = 0;
+  else CURRENT_GPIO_STATE = 1;
+
+  if(ioctl(led.fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, &data) < 0)
+    perror("Error setting GPIO to 1");
+
+  // debug
+  //UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, \
+  //            "GPIO = %d",  CURRENT_GPIO_STATE);
+
+  close(fd);
+  close(led.fd);
+  return 0;
+}
 
 /* callback to handle change notifications */
 static void dataChangeNotificationCallback(UA_Server *server, UA_UInt32 monitoredItemId,
@@ -45,6 +95,11 @@ static void dataChangeNotificationCallback(UA_Server *server, UA_UInt32 monitore
 
           // Add to our local linked list
           addItem(&SUBSCRIBER_DICT, coupler_id_str, milli_seconds_now_str);
+
+	  // set GPIO so we can monitor using logical analyzer the work of
+	  // keep-alive network system
+	  if (CURRENT_GPIO_MODE) setGPIO();
+
 	}
     }
 }