Why is the printer not connecting to the application?

f your SEZNIK DEV printer is not connecting to the application, the issue is usually caused by one of these reasons:

Printer is not paired via Bluetooth
Incorrect printer command mode is selected
Wrong printer is selected inside the app
Application is not updated
Printer is turned OFF or battery is low

Detailed Explanation

For the DEV printer to connect properly, both the printer settings and the application settings must match.

Check these one by one:

1. Make sure the printer is paired via Bluetooth

Before the app can connect, the printer should be paired properly through Bluetooth.
Turn ON Bluetooth on your phone, open the app, tap the Printer icon, and select SEZNIK 2-in-1 DEV Printer. If pairing asks for a code, enter 0000 or 1234.

2. Check the selected printer command mode

The DEV printer supports different printer command modes:

ESC → for continuous paper / receipts
CPCL → for normal gap labels / black mark labels
TSPL → for better print quality and advanced formatting

If the wrong mode is selected, the printer may fail to work correctly with the app.

3. Make sure the correct printer is selected in the app

If another device is selected, or the app is not pointing to SEZNIK 2-in-1 DEV Printer, the connection may fail. Reopen the printer list and select the correct printer again.

4. Update the application

If the app is outdated, it may cause connection or compatibility issues. Update the application to the latest version and try again. The DEV documentation specifically notes this as one of the possible reasons.

5. Check power and battery

If the printer is turned OFF or the battery is low, the app may not connect properly. Make sure the printer is ON and has sufficient battery before reconnecting. The DEV printer also uses 5 blinking lights to indicate low battery.

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