No need to set mode if it's already set.

coupler/opc-ua-server/keep_alive.h

@@ -31,6 +31,7 @@ void gotoSafeMode() {
    * In this mode coupler will shutdown all
    * relays of attached I2C slaves
    */
+   if (!I2C_VIRTUAL_MODE) {
      UA_LOG_INFO(UA_Log_Stdout, \
                  UA_LOGCATEGORY_USERLAND, \
                  "Go to SAFE MODE");
@@ -40,6 +41,7 @@ void gotoSafeMode() {
     // set to virtual mode which means that coupler will mimic working but
     // not set any related relays' state
     I2C_VIRTUAL_MODE = 1;
+  }
 
 }