Do not override initial operational mode of the coupler by

switching from safe to normal modes.
This way both keep-alive safety network implementation and virtual
(testing mode) could co-exists together.

coupler/cli.h

@@ -154,7 +154,8 @@ void handleCLI(int argc, char **argv) {
 
     // transfer to global variables (CLI input)
     COUPLER_ID = arguments.id;
-    I2C_VIRTUAL_MODE = arguments.mode;
+    OPERATIONAL_MODE = arguments.mode;
+    I2C_VIRTUAL_MODE = OPERATIONAL_MODE;
     I2C_BLOCK_DEVICE_NAME = arguments.device;
     HEART_BEAT_INTERVAL = arguments.heart_beat_interval;
     PUBLISHING_INTERVAL = HEART_BEAT_INTERVAL; // we assume that each heart_beat leads to a publish event

coupler/keep_alive.h

@@ -29,11 +29,11 @@ static int HEART_BEAT_TIMEOUT_INTERVAL = DEFAULT_HEART_BEAT_TIMEOUT_INTERVAL;
 // XXX: assume ONLY 8 couplers!
 unsigned int HEART_BEAT_ID_LIST[] = {0, 0, 0, 0, 0, 0, 0, 0};
 
-// the interval for publishing messages$
+// the interval for publishing messages
 static int PUBLISHING_INTERVAL = 10;
 
-// a hard coded writer group, data set and publisher ID$
-// (should be same for publisher / subscriber)$
+// a hard coded writer group, data set and publisher ID
+// (should be same for publisher / subscriber)
 const int WRITER_GROUP_ID = 100;
 const int DATASET_WRITER_ID = 62541;
 const int PUBLISHER_ID = 2234;
@@ -48,8 +48,12 @@ void gotoSafeMode() {
                  UA_LOGCATEGORY_USERLAND, \
                  "Go to SAFE MODE");
 
-    // do shutdown all attached I2C slaves (MOD-IO's relays).
-    safeShutdownI2CSlaveList();
+    if (OPERATIONAL_MODE==0) {
+      // do shutdown all attached I2C slaves (MOD-IO's relays).
+      // only if initial operational mode is appropriate.
+      safeShutdownI2CSlaveList();
+    }
+
     // set to virtual mode which means that coupler will mimic working but
     // not set any related relays' state
     I2C_VIRTUAL_MODE = 1;

coupler/mod_io_i2c.h

@@ -15,6 +15,11 @@ int I2C_SLAVE_ADDR_LIST[] = {0, 0};
 static char *DEFAULT_I2C_BLOCK_DEVICE_NAME = "/dev/i2c-1";
 char *I2C_BLOCK_DEVICE_NAME;
 
+// global coupler mode
+// 0 - normal operational mode
+// 1 - virtual operational mode (no real I2C to MOD-IO command issued)
+bool OPERATIONAL_MODE = 0;
+
 // global virtual mode needed for testing on x86 platform
 bool I2C_VIRTUAL_MODE = 0;