diff --git a/arduino/discovery/discovery.go b/arduino/discovery/discovery.go
index 78956a63331..648c536733d 100644
--- a/arduino/discovery/discovery.go
+++ b/arduino/discovery/discovery.go
@@ -311,9 +311,11 @@ func (disc *PluggableDiscovery) Run() (err error) {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return fmt.Errorf(tr("calling %[1]s: %[2]w"), "HELLO", err)
 	} else if msg.EventType != "hello" {
-		return errors.Errorf(tr("communication out of sync, expected 'hello', received '%s'"), msg.EventType)
-	} else if msg.Message != "OK" || msg.Error {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "hello", msg.EventType)
+	} else if msg.Error {
 		return errors.Errorf(tr("command failed: %s"), msg.Message)
+	} else if strings.ToUpper(msg.Message) != "OK" {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
 	} else if msg.ProtocolVersion > 1 {
 		return errors.Errorf(tr("protocol version not supported: requested 1, got %d"), msg.ProtocolVersion)
 	}
@@ -332,9 +334,11 @@ func (disc *PluggableDiscovery) Start() error {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return fmt.Errorf(tr("calling %[1]s: %[2]w"), "START", err)
 	} else if msg.EventType != "start" {
-		return errors.Errorf(tr("communication out of sync, expected 'start', received '%s'"), msg.EventType)
-	} else if msg.Message != "OK" || msg.Error {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "start", msg.EventType)
+	} else if msg.Error {
 		return errors.Errorf(tr("command failed: %s"), msg.Message)
+	} else if strings.ToUpper(msg.Message) != "OK" {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
 	}
 	disc.statusMutex.Lock()
 	defer disc.statusMutex.Unlock()
@@ -352,9 +356,11 @@ func (disc *PluggableDiscovery) Stop() error {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return fmt.Errorf(tr("calling %[1]s: %[2]w"), "STOP", err)
 	} else if msg.EventType != "stop" {
-		return errors.Errorf(tr("communication out of sync, expected 'stop', received '%s'"), msg.EventType)
-	} else if msg.Message != "OK" || msg.Error {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "stop", msg.EventType)
+	} else if msg.Error {
 		return errors.Errorf(tr("command failed: %s"), msg.Message)
+	} else if strings.ToUpper(msg.Message) != "OK" {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
 	}
 	disc.statusMutex.Lock()
 	defer disc.statusMutex.Unlock()
@@ -375,9 +381,11 @@ func (disc *PluggableDiscovery) Quit() error {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return fmt.Errorf(tr("calling %[1]s: %[2]w"), "QUIT", err)
 	} else if msg.EventType != "quit" {
-		return errors.Errorf(tr("communication out of sync, expected 'quit', received '%s'"), msg.EventType)
-	} else if msg.Message != "OK" || msg.Error {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "quit", msg.EventType)
+	} else if msg.Error {
 		return errors.Errorf(tr("command failed: %s"), msg.Message)
+	} else if strings.ToUpper(msg.Message) != "OK" {
+		return errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
 	}
 	disc.killProcess()
 	return nil
@@ -392,7 +400,7 @@ func (disc *PluggableDiscovery) List() ([]*Port, error) {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return nil, fmt.Errorf(tr("calling %[1]s: %[2]w"), "LIST", err)
 	} else if msg.EventType != "list" {
-		return nil, errors.Errorf(tr("communication out of sync, expected 'list', received '%s'"), msg.EventType)
+		return nil, errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "list", msg.EventType)
 	} else if msg.Error {
 		return nil, errors.Errorf(tr("command failed: %s"), msg.Message)
 	} else {
@@ -415,9 +423,11 @@ func (disc *PluggableDiscovery) StartSync(size int) (<-chan *Event, error) {
 	if msg, err := disc.waitMessage(time.Second * 10); err != nil {
 		return nil, fmt.Errorf(tr("calling %[1]s: %[2]w"), "START_SYNC", err)
 	} else if msg.EventType != "start_sync" {
-		return nil, errors.Errorf(tr("communication out of sync, expected 'start_sync', received '%s'"), msg.EventType)
-	} else if msg.Message != "OK" || msg.Error {
+		return nil, errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "start_sync", msg.EventType)
+	} else if msg.Error {
 		return nil, errors.Errorf(tr("command failed: %s"), msg.Message)
+	} else if strings.ToUpper(msg.Message) != "OK" {
+		return nil, errors.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
 	}
 
 	disc.statusMutex.Lock()
diff --git a/arduino/monitor/monitor.go b/arduino/monitor/monitor.go
index 76e36b6223f..09db6b2bdbf 100644
--- a/arduino/monitor/monitor.go
+++ b/arduino/monitor/monitor.go
@@ -145,9 +145,12 @@ func (mon *PluggableMonitor) waitMessage(timeout time.Duration, expectedEvt stri
 	if msg.EventType != expectedEvt {
 		return msg, fmt.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), expectedEvt, msg.EventType)
 	}
-	if msg.Message != "OK" || msg.Error {
+	if msg.Error {
 		return msg, fmt.Errorf(tr("command '%[1]s' failed: %[2]s"), expectedEvt, msg.Message)
 	}
+	if strings.ToUpper(msg.Message) != "OK" {
+		return msg, fmt.Errorf(tr("communication out of sync, expected '%[1]s', received '%[2]s'"), "OK", msg.Message)
+	}
 	return msg, nil
 }