Android SDK

// app/build.gradle
dependencies {
    implementation files('libs/SkyBandSDK-release.aar')
}

val ecrLib = CLibraryLoad()

// Connect via TCP/IP
val socket = Socket("192.168.0.102", 8888)

// Register ECR (txnType = 17)
val registerReq = ecrLib.pack(requestData, 17, signature)
socket.outputStream.write(registerReq)
val response = socket.inputStream.read(buffer)
val parsed = ecrLib.parse(response)

// Purchase (txnType = 0)
val purchaseReq = ecrLib.pack(requestData, 0, signature)
socket.outputStream.write(purchaseReq)
val purchaseResp = socket.inputStream.read(buffer)
val result = ecrLib.parse(purchaseResp)