How to Check If A Server Is Reachable With Retrofit In Kotlin?

Best Tools to Ensure Server Connectivity to Buy in January 2026

1

Elevator Blue Server Test Tool GAA21750AK3 Elevators Lift Operator Debugger Blue TT Service Test Tool use for Otis XIZI Otis Elevator

• UNIVERSAL TOOL FOR ALL OTIS AND XIZI ELEVATORS-ULTIMATE COMPATIBILITY!
• UNLIMITED CHECKS AND ADJUSTMENTS FOR GECB DATA-BOOST EFFICIENCY!
• POWERFUL FUNCTIONS AND DOUBLE-LINE LCD FOR CLEAR PERFORMANCE INSIGHTS!

BUY & SAVE

$76.49

2

Lqito GAA21750AK3 Elevator Blue Server Test Tool Unlimited Times Unlock Lift Elevators Operator Debugger Service Tool TT/Converter Compatible with All The Otis and XIZI Otis Elevator

• COMPATIBLE WITH ALL OTIS AND XIZI ELEVATORS FOR VERSATILE USE.
• ADVANCED FEATURES IMPROVE EFFICIENCY AND DATA DETECTION CAPABILITIES.
• HIGH-QUALITY, DURABLE DESIGN ENSURES LONG-LASTING PERFORMANCE.

BUY & SAVE

$53.99

3

LITKEQ GAA21750AK3 Elevator Blue Test Tool Unlimited Times Unlock Elevator Service Tool Blue Server

• COMPACT DESIGN: 178 X 96 X 42MM, EASY TO HANDLE.
• CLEAR DOUBLE LINE LCD DISPLAY FOR EASY READINGS.
• COMPATIBLE WITH ALL OTIS & XIZI OTIS ELEVATORS.

BUY & SAVE

$79.89

4

DIYmall RC Servo Tester 3CH Digital Multi Servo Tester ECS RC Consistency CCMP Master Speed Controller Checker

• TEST AND CONFIGURE SERVOS WITHOUT A TRANSMITTER OR RECEIVER!
• VERSATILE: WORKS AS A SIGNAL GENERATOR FOR ESCS TOO!
• EASILY DETECT JITTER, MEDIAN, AND VIRTUAL SPACES IN SERVOS!

BUY & SAVE

$6.59

5

2 Pack ShareGoo 3CH 4.8-6V Servo Tester CCPM Consistency Master Checker with Reverse Connection Protection,RC ECS Motor Tester Server Test Servo Centering Tool

• THREE MODES FOR PRECISE SERVO AND ESC CONFIGURATION.

• CONNECTS UP TO 3 SERVOS FOR CCPM HELICOPTERS AND AIRPLANES.

• SIGNAL GENERATOR FOR EASY MOTOR SYSTEM TESTING WITHOUT A TRANSMITTER.

BUY & SAVE

$8.69

6

Jectse LCD Display Elevator Test Tool,Blue Plastic Elevator Server Debugging Fit,for Detect Elevator Status

• USER-FRIENDLY LCD DISPLAY FOR EASY ELEVATOR STATUS MONITORING.
• DURABLE CONSTRUCTION ENSURES LONG-LASTING AND RELIABLE PERFORMANCE.
• ESSENTIAL TOOL FOR EFFICIENT AND EFFECTIVE ELEVATOR INSPECTIONS.

BUY & SAVE

$60.46

7

EIMSOAH Memory Tester, Memory Diagnostic Analyzer, 4 in 1 Desktop DDR3 DDR4 DDR5UDMM DDR5RDIMM Tester Card for Desktop Server Computers

• QUICK FAULT DETECTION: INDICATOR LIGHTS FOR RAPID DIAGNOSIS AND REPAIRS.
• UNIVERSAL COMPATIBILITY: WORKS WITH DDR3, DDR4, AND DDR5 MEMORY TYPES.
• VERSATILE POWER OPTIONS: BATTERY OR TYPE-C CHARGING FOR CONVENIENCE.

BUY & SAVE

$42.09

8

NF-468CS Network Cable Tester,RJ45/RJ11/CAT5/CAT6/CAT5E/CAT6A/ CAT7/POE Test UTP/STP Continuity Tester Ethernet Cable Mapper Phone Line CAT3, Ethernet Cable Tester, LAN Cable Test Network Tools

• COMPREHENSIVE TESTING: DETECTS FAULTS IN RJ11/RJ45 CABLES UP TO 1000M.

• QUICK RESULTS: INSTANT TEST RESULTS WITH A SINGLE BUTTON FOR EASE OF USE.

• POE POWER CHECK: IDENTIFY POWER TYPES AND VOLTAGE WITH LED DISPLAY.

BUY & SAVE

$28.89

9

Multifunction RJ45 Network Caber Tester, 4" IPS Touch Screen UTP Cable Tester,Rechargeable Ethernet Cable Tracer,Support Network Tools, POE++ Detect,Cable Length Meter,RJ45 TDR Test, NCV,PD Power,FTP

• QUICKLY LOCATES CABLE ISSUES: ADVANCED TESTING FOR FAULT POINTS IN RJ45 CABLES.

• COMPREHENSIVE NETWORK TOOLS: SUPPORTS POE DETECTION AND IP SCANNING FEATURES.

• USER-FRIENDLY DESIGN: RECHARGEABLE BATTERY AND CLEAR 4 TOUCH SCREEN DISPLAY.

BUY & SAVE

$129.99 $139.99

Save 7%

10

Professional Network Tool Kit, ZOERAX 14 in 1 - RJ45 Crimp Tool, Cat6 Pass Through Connectors and Boots, Cable Tester, Wire Stripper, Ethernet Punch Down Tool

• ALL-IN-ONE TOOLKIT ENSURES SECURE ORGANIZATION FOR ON-THE-GO CONVENIENCE.
• COMPLETE SET EMPOWERS PROS & DIYERS FOR RELIABLE NETWORK CONNECTIONS.
• VERSATILE CRIMPER WITH QUICK ADJUSTMENTS SIMPLIFIES CABLE MAKING TASKS.

BUY & SAVE

$64.99

+

ONE MORE?

To check if a server is reachable using Retrofit in Kotlin, you can follow the steps below:

1. Import the necessary dependencies in your Kotlin project. This includes the Retrofit library and the required network permission in your AndroidManifest.xml file:

implementation 'com.squareup.retrofit2:retrofit:2.x.x' implementation 'com.squareup.retrofit2:converter-gson:2.x.x'

1. Create an interface for your API using Retrofit annotations. Define a method to perform a basic request to the server, such as a GET request:

interface ApiService { @GET("your-endpoint-url-here") fun checkServer(): Call }

1. Create an instance of Retrofit with the desired base URL in your project. You can use this instance to create a service with the ApiService interface:

val retrofit = Retrofit.Builder() .baseUrl("http://your-base-url.com/") .addConverterFactory(GsonConverterFactory.create()) .build()

val apiService = retrofit.create(ApiService::class.java)

1. Use the created service instance to make a request to the server and check if it is reachable. You can enqueue the request and implement the appropriate callbacks:

apiService.checkServer().enqueue(object : Callback { override fun onResponse(call: Call, response: Response) { if (response.isSuccessful) { // Server is reachable } else { // Server is not reachable } }

override fun onFailure(call: Call<ResponseBody>, t: Throwable) {
    // Request failed or server is not reachable
}

})

1. Based on the response received in the onResponse callback, you can determine whether the server is reachable or not. A successful response indicates that the server is reachable, while an unsuccessful response or failure in the onFailure callback indicates otherwise.

These steps allow you to use Retrofit in Kotlin to check if a server is reachable. You can customize the API interface, handle different response scenarios, and add necessary error handling based on your specific requirements.

How to pass dynamic values in the URL using Retrofit in Kotlin?

To pass dynamic values in the URL using Retrofit in Kotlin, you can make use of the @Path annotation followed by the dynamic value. Here's an example:

1. Define your Retrofit interface:

interface ApiService {

@GET("/users/{userId}")
suspend fun getUserDetails(@Path("userId") userId: String): Response<User>

}

1. Create an instance of Retrofit:

val retrofit = Retrofit.Builder() .baseUrl(BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .build()

val apiService = retrofit.create(ApiService::class.java)

1. Call the API method and pass the dynamic value:

val userId = "your_dynamic_value" val response = apiService.getUserDetails(userId)

if(response.isSuccessful) { val user = response.body() // Handle the user details } else { // Handle the API error }

In the example above, the @Path("userId") annotation is used to specify that the value of userId should be dynamically replaced in the URL. The specified dynamic value will be replaced with the actual value passed when making the API call.

How to define a GET request using Retrofit in Kotlin?

To define a GET request using Retrofit in Kotlin, follow the steps below:

1. Add the Retrofit dependency to your build.gradle file:

implementation 'com.squareup.retrofit2:retrofit:2.x.x' implementation 'com.squareup.retrofit2:converter-gson:2.x.x' // Add this line if you are using JSON responses

1. Create a data class to represent the response model for the API endpoint. For example, if the API returns a JSON response containing a list of users, you can create a data class like this:

data class User(val id: Int, val name: String)

1. Create an interface to define the API endpoints. Use the @GET annotation to specify the endpoint path, and define a function with the desired return type (Call in this example). You can also add query parameters using the @Query annotation:

interface ApiInterface { @GET("users") fun getUsers(): Call<List>

@GET("users")
fun getUserById(@Query("id") id: Int): Call<User>

}

1. Create a Retrofit instance by passing the base URL to the Retrofit.Builder() and add the converter factory for parsing the response (e.g., GsonConverterFactory for JSON):

val retrofit = Retrofit.Builder() .baseUrl("https://api.example.com/") .addConverterFactory(GsonConverterFactory.create()) .build()

1. Create an instance of the API interface by calling create() on the Retrofit instance:

val apiInterface = retrofit.create(ApiInterface::class.java)

1. Make the GET request by calling the corresponding function on the API interface. You can enqueue the request using enqueue() to handle the response asynchronously:

apiInterface.getUsers().enqueue(object : Callback<List> { override fun onResponse(call: Call<List>, response: Response<List>) { if (response.isSuccessful) { val users = response.body() // Process the list of users } else { // Handle error case } }

override fun onFailure(call: Call<List<User>>, t: Throwable) {
    // Handle network failure
}

})

That's it! You have now defined a GET request using Retrofit in Kotlin.

How to define a POST request using Retrofit in Kotlin?

To define a POST request using Retrofit in Kotlin, you need to follow these steps:

Step 1: Add Retrofit dependency Make sure you have added the Retrofit dependency in your project's build.gradle file.

implementation 'com.squareup.retrofit2:retrofit:2.9.0'

Step 2: Define the API interface Create an interface that represents your API endpoints. Define a method with the @POST annotation and specify the endpoint path. In the method parameters, annotate the request body with @Body annotation.

interface ApiService { @POST("your/endpoint/path") suspend fun postData(@Body request: RequestBody): ResponseBody }

Step 3: Create a Retrofit instance Create a Retrofit instance by specifying the base URL and converter factory. You can set the converter factory as ConverterFactory.create().

val retrofit = Retrofit.Builder() .baseUrl("https://api.example.com/") .addConverterFactory(GsonConverterFactory.create()) .build()

val apiService = retrofit.create(ApiService::class.java)

Step 4: Make the POST request Invoke the defined method on the apiService variable and pass the request body as the parameter. Since Retrofit 2.6, you can use suspend modifier on the method (as shown in the example) to make it a suspend function and use it with coroutines.

val requestBody = RequestBody.create(MediaType.parse("application/json"), yourJsonString)

// Using CoroutineScope and async CoroutineScope(Dispatchers.IO).launch { val response = apiService.postData(requestBody) if (response.isSuccessful) { // Handle success } else { // Handle failure } }

Note: Replace 'your/endpoint/path' with the actual endpoint URL and yourJsonString with the JSON payload you want to send as the request body. Also, make sure to handle the response accordingly in the success and failure blocks.

Remember to handle exceptions appropriately and handle network requests in a background thread using coroutines or other concurrency mechanisms.