This article provides instructions on explicitly configuring your Ditto instance to listen for connections on a specific port and to connect to remote instances using a host (IP) and port.
Although Ditto automatically attempts to connect to other instances on the Local Area Network (LAN), Bluetooth Low Energy (LE), and Apple Wireless Direct Link (AWDL), supplying a DittoTransportConfig does not enable this feature by default.Rather, you manually enable peer-to-peer connections using EnableAllPeerToPeer(). (See Enabling and Disabling Transports for more information.)

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Enabling and Disabling Transports


// Create a new DittoTransportConfig()
var config = DittoTransportConfig()

//Enable all peer to peer transports
config.enableAllPeerToPeer()

//Or enable/disable each transport separately
//BluetoothLe
config.peerToPeer.bluetoothLE.isEnabled = true
//Local Area Network
config.peerToPeer.lan.isEnabled = true
//Awdl
config.peerToPeer.awdl.isEnabled = true

ditto.transportConfig = config

do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Configuring Additional Settings

If you need additional connection configurations for the current Ditto instance, configure it to listen for connections on a specific port and to connect to remote instances using a host (IP) and port:
1

Before calling startSync(), create a DittoTransportConfig object with the desired settings.
2

Using the ditto.SetTransportConfig API method, set the created object on your Ditto instance.
3

Call the startSync method on your Ditto instance to initiate sync with the configured settings.

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Syncing with Big Peer


let ditto = Ditto(identity: .onlinePlayground(
    appID: "REPLACE_ME_WITH_YOUR_APP_ID",
    token: "REPLACE_ME_WITH_YOUR_PLAYGROUND_TOKEN",
    // Set to false to disable syncing with the cloud
    enableDittoCloudSync: true
))
do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Connecting to Remote Small Peers


var config = DittoTransportConfig()
// Connect explicitly to a remote devices
config.connect.tcpServers.insert("135.1.5.5:12345")
config.connect.tcpServers.insert("185.1.5.5:12345")

ditto.transportConfig = config

do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Initializing WebSocket Connections

Ensure WebSocket connections are discoverable across peers within your local network: 

var config = DittoTransportConfig()
config.connect.webSocketURLs.insert("ws://127.0.0.1")
ditto.transportConfig = config

do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Listening for Connections


var config = DittoTransportConfig()

// Listen for incoming connections on port 4000
config.listen.tcp.isEnabled = true
config.listen.tcp.interfaceIP = "0.0.0.0"
config.listen.tcp.port = 4000

ditto.transportConfig = config

do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Combining Multiple Transports


var config = DittoTransportConfig()
// 1. Enable All Peer to Peer Connections
config.enableAllPeerToPeer()

// 2. Listen for incoming connections on port 4000
config.listen.tcp.isEnabled = true
config.listen.tcp.interfaceIP = "0.0.0.0"
config.listen.tcp.port = 4000

// 3. Connect explicitly to remote devices
config.connect.tcpServers.insert("135.1.5.5:12345")
config.connect.tcpServers.insert("185.1.5.5:12345")

ditto.transportConfig = config

do {
  try ditto.startSync()
} catch (let err) {
  print(err.localizedDescription)
}

​
Monitoring Conditions


// Setting up inside a ViewController
let ditto = Ditto(identity: DittoIdentity.onlinePlayground(appID: "REPLACE_ME_WITH_YOUR_APP_ID", token: "REPLACE_ME_WITH_YOUR_PLAYGROUND_TOKEN"))
ditto.delegate = self
try! ditto.startSync()

// Now you can observe real time changes to the transport conditions:
extension ViewController: DittoDelegate {
   func transportConditionDidChange(transportID: Int64, condition: TransportCondition) {
       if condition == .BleDisabled {
           print("BLE disabled")
       } else if condition == .NoBleCentralPermission {
           print("Permission missing for BLE")
       } else if condition == .NoBlePeripheralPermission {
           print("Permission missing for BLE")
       }
   }