Android connection to linux

How to set up a wifi-direct connection between android and linux?

Establishing a Wi-Fi Direct connection between an Android device and a Linux device can be challenging. Wi-Fi Direct is a technology that allows for peer-to-peer connections to be established between devices without the need for an intermediate router or access point. This technology can be used to connect a range of devices, including Android smartphones and Linux-based computers. In this article, we will explore the steps needed to set up a Wi-Fi Direct connection between an Android device and a Linux device.

Method 1: Using Wifi Direct on Android

Step 1: Declare Wifi-Direct Permissions

Add the following permissions to your AndroidManifest.xml file:

uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> uses-permission android:name="android.permission.INTERNET" /> uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Step 2: Create a Wifi-Direct Manager

Create a WifiP2pManager object and a Channel object to manage Wifi-Direct connections:

WifiP2pManager wifiP2pManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); WifiP2pManager.Channel channel = wifiP2pManager.initialize(this, getMainLooper(), null);

Step 3: Register Broadcast Receiver

Register a broadcast receiver to receive Wifi-Direct events:

BroadcastReceiver receiver = new WifiDirectBroadcastReceiver(wifiP2pManager, channel, this); IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION); registerReceiver(receiver, intentFilter);

Step 4: Discover Peers

Discover available Wifi-Direct peers:

wifiP2pManager.discoverPeers(channel, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Code for when the discovery initiation is successful goes here. // No services have actually been discovered yet, so this method // can often be left blank. Code for peer discovery goes in the // onReceive method, detailed below. > @Override public void onFailure(int reasonCode)  // Code for when the discovery initiation fails goes here. // Alert the user that something went wrong. > >);

Step 5: Connect to a Peer

Connect to a Wifi-Direct peer:

WifiP2pConfig config = new WifiP2pConfig(); config.deviceAddress = device.deviceAddress; config.wps.setup = WpsInfo.PBC; wifiP2pManager.connect(channel, config, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Code for when the connection request succeeds goes here. > @Override public void onFailure(int reason)  // Code for when the connection request fails goes here. // Alert the user that the connection failed. > >);

Step 6: Create a Server Socket

Create a server socket to listen for incoming connections:

ServerSocket serverSocket = new ServerSocket(0); int port = serverSocket.getLocalPort();

Step 7: Advertise Service

Advertise the service to other Wifi-Direct peers:

WifiP2pDnsSdServiceInfo serviceInfo = WifiP2pDnsSdServiceInfo.newInstance( SERVICE_NAME, SERVICE_TYPE, serviceRecord); wifiP2pManager.addLocalService(channel, serviceInfo, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Code for when the service is successfully advertised goes here. > @Override public void onFailure(int reason)  // Code for when the service advertising fails goes here. > >);

Step 8: Discover Services

Discover available services on other Wifi-Direct peers:

wifiP2pManager.setDnsSdResponseListeners(channel, new WifiP2pManager.DnsSdServiceResponseListener()  @Override public void onDnsSdServiceAvailable(String instanceName, String registrationType, WifiP2pDevice srcDevice)  // Code for when a service is discovered goes here. > >, new WifiP2pManager.DnsSdTxtRecordListener()  @Override public void onDnsSdTxtRecordAvailable(String fullDomainName, MapString, String> record, WifiP2pDevice device)  // Code for when a TXT record is available goes here. > >); wifiP2pManager.discoverServices(channel, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Code for when the service discovery initiation is successful goes here. > @Override public void onFailure(int reason)  // Code for when the service discovery initiation fails goes here. > >);

Step 9: Connect to a Service

Connect to a service on another Wifi-Direct peer:

WifiP2pConfig config = new WifiP2pConfig(); config.deviceAddress = device.deviceAddress; config.wps.setup = WpsInfo.PBC; wifiP2pManager.connect(channel, config, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Code for when the connection request succeeds goes here. > @Override public void onFailure(int reason)  // Code for when the connection request fails goes here. // Alert the user that the connection failed. > >);

Method 2: Using Wifi Direct on Linux

Step 1: Check if your Linux device supports Wifi Direct

First, make sure your Linux device supports Wifi Direct. You can check this by running the following command in the terminal:

iw list | grep "Supported interface modes" -A 8

If you see «P2P-client» and «P2P-GO» in the output, it means your device supports Wifi Direct.

Step 2: Install the necessary packages

Next, you need to install the necessary packages to enable Wifi Direct on Linux. Run the following command in the terminal:

sudo apt-get install wireless-tools hostapd wpasupplicant

Step 3: Configure the Wifi Direct interface

Now, you need to configure the Wifi Direct interface on your Linux device. Run the following commands in the terminal:

sudo ip link set wlp2s0 down sudo iw dev wlp2s0 set type managed sudo ip link set wlp2s0 up sudo iw dev wlp2s0 interface add p2p0 type __p2p sudo ip link set p2p0 up sudo iw dev p2p0 set channel 6

Note: Replace «wlp2s0» with the name of your Wifi interface.

Step 4: Create a Wifi Direct group

To create a Wifi Direct group, you need to run the following command in the terminal:

sudo wpa_cli -i p2p0 p2p_group_add

This will create a new Wifi Direct group and return the group ID.

Step 5: Connect your Android device to the Wifi Direct group

On your Android device, go to Settings > Wi-Fi > Wi-Fi Direct. Your Linux device should appear in the list of available devices. Tap on it to connect.

Step 6: Transfer files between devices

Once the devices are connected, you can transfer files between them using standard file transfer methods.

Method 3: Using an Application to Connect Android and Linux Devices

To set up a WiFi-Direct connection between Android and Linux, we can use an application that facilitates the connection. Here are the steps to do it:

Step 1: Add Permissions to the Android Manifest

In the AndroidManifest.xml file, add the following permissions:

uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> uses-permission android:name="android.permission.INTERNET" />

Step 2: Create a WiFi-Direct Connection on Android

Create a WiFi-Direct connection on Android using the following code:

WifiP2pManager wifiManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); WifiP2pManager.Channel wifiChannel = wifiManager.initialize(this, getMainLooper(), null); wifiManager.discoverPeers(wifiChannel, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Peer discovery started > @Override public void onFailure(int reasonCode)  // Peer discovery failed > >);

Step 3: Connect to the Linux Device

Connect to the Linux device using the following code:

WifiP2pConfig config = new WifiP2pConfig(); config.deviceAddress = "00:11:22:33:44:55"; // Replace with the MAC address of the Linux device config.wps.setup = WpsInfo.PBC; // Set the Wi-Fi Protected Setup (WPS) method wifiManager.connect(wifiChannel, config, new WifiP2pManager.ActionListener()  @Override public void onSuccess()  // Connection successful > @Override public void onFailure(int reasonCode)  // Connection failed > >);

Step 4: Create a Server Socket on Linux

Create a server socket on Linux using the following code:

sudo apt-get install netcat-traditional nc -l 8888

Step 5: Create a Client Socket on Android

Create a client socket on Android using the following code:

Socket socket = new Socket(); socket.bind(null); socket.connect((new InetSocketAddress("192.168.49.1", 8888)), 5000); // Replace with the IP address of the Linux device

Step 6: Send and Receive Data

Send and receive data between Android and Linux using the following code:

// Send data from Android to Linux OutputStream outputStream = socket.getOutputStream(); outputStream.write("Hello from Android".getBytes()); // Receive data from Linux to Android InputStream inputStream = socket.getInputStream(); byte[] buffer = new byte[1024]; int bytesRead = inputStream.read(buffer); String data = new String(buffer, 0, bytesRead);

That’s it! You have successfully set up a WiFi-Direct connection between Android and Linux using an application.

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