updated the app to use tview because the bubbletea code was unmaintainable

device.go

@@ -10,8 +10,8 @@ import (
 
 // Device manages the serial connection to the Cardputer.
 type Device struct {
-	PortName string
-	Port     serial.Port
+	PortName  string
+	Port      serial.Port
 	Connected bool
 }
 
@@ -59,9 +59,22 @@ func (d *Device) Connect() error {
 		d.Close()
 		return fmt.Errorf("failed to send dev mode request: %w", err)
 	}
-    
-    // Allow some time for the device to respond or settle if needed
-    time.Sleep(100 * time.Millisecond)
+
+	// Allow some time for the device to respond or settle if needed
+	time.Sleep(100 * time.Millisecond)
+
+	return nil
+}
+
+// ExitDevMode sends the command to exit dev mode.
+func (d *Device) ExitDevMode() error {
+	if !d.Connected || d.Port == nil {
+		return fmt.Errorf("device not connected")
+	}
+
+	// Send exit dev mode command
+	// TODO: Replace with the actual command sequence to exit dev mode
+	// This is currently not implemented on the Cardputer side.
 
 	return nil
 }
@@ -69,6 +82,12 @@ func (d *Device) Connect() error {
 // Close closes the serial port.
 func (d *Device) Close() error {
 	if d.Port != nil {
+		// Try to exit dev mode before closing
+		_ = d.ExitDevMode()
+
+		// Allow some time for the command to be processed
+		time.Sleep(100 * time.Millisecond)
+
 		err := d.Port.Close()
 		d.Port = nil
 		d.Connected = false