Member Avatar for amotalebnet
amotalebnet 0 Newbie Poster

Hi daniweb,
i m happy join woith u ,and isk tou I'm finding a way to create a 'plug and play' printing apps that can send the document softcopy to a bluetooth tethered device on the fly.
I'm seeking advice on which programming language should i get into with to develop the apps.
For advancement, I would like to make the device to connect via NFC instead of bluetooth.

Thanks and regards.

  • 1 Contributor
  • 0 Replies
  • 283 Views

Dani AI

Generated

Quick practical guide for

For on-the-fly printing from an Android device the most reliable approach is a native Android app (Kotlin is the current recommended language; Java is fine too). Two common workflows: use the Android Print framework (android.print) when the printer is exposed to the system print service, or talk directly to the printer over Bluetooth when the device expects raw bytes (common for receipt/thermal printers that use ESC/POS or a serial interface). Before coding, check the target printer’s supported Bluetooth profile — many small printers use RFCOMM / SPP and accept raw command streams.

If you choose native Android, the simplest pattern for SPP printers is:

  • discover/pair the Bluetooth device,
  • open an RFCOMM socket to the device’s SPP UUID,
  • write the print bytes (ESC/POS or pre-rendered bitmap/PDF converted to printer format),
  • handle reconnects and errors.

Example (Kotlin skeleton):

val sppUuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")
val socket = device.createRfcommSocketToServiceRecord(sppUuid)
socket.connect()
socket.outputStream.write(dataBytes)
socket.close()

If you prefer non-JVM languages: Python can prototype (Kivy, Chaquopy, or a separate Python microservice), but Bluetooth and background integration are easier with native code or via a small native module called from your higher-level UI (Flutter/React Native also work using native plugins).

A note on NFC: use NFC to trigger the app, hand the printer ID, or start pairing/handover. Don’t rely on OS-level automatic pairing across all phones—store a short token or MAC in the tag and let your app perform the connection.

Troubleshooting tips: confirm printer encoding (ESC/POS vs. printer PDF), request and handle runtime Bluetooth permissions (Android 12+ adds BLUETOOTH_CONNECT/BLUETOOTH_SCAN), test with a known working Bluetooth printer, log socket states, and build a small retries/backoff for unstable links.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.