> For the complete documentation index, see [llms.txt](https://docs.kiloiot.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kiloiot.io/kilo-mioty-service-center/integrations/api-reference/go-examples.md).

# Go Examples

Runnable Go examples for the KiloCenter gRPC API — generate stubs with buf, authenticate, and call uplink methods.

This page provides runnable Go examples for the KiloCenter gRPC API. For the full API reference, see API Reference.

For general Go gRPC documentation, see [grpc.io/docs/languages/go](https://grpc.io/docs/languages/go/).

### Prerequisites

> All commands in this guide assume your working directory is `kilocenter-modules/`.

Generate Go stubs from the proto definitions using buf:

```bash
cd KC-Core/api/proto && buf generate
```

This produces generated code in `KC-Core/api/gen/kilocenter/v1/`.

Install the required Go modules:

```bash
go get google.golang.org/grpc
go get google.golang.org/protobuf
```

### Get System Status

Retrieves the current system status including version, uptime, and service health.

```go
package main

import (
	"context"
	"fmt"
	"log"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/protobuf/types/known/emptypb"

	kilocenterv1 "github.com/kilocenter/KC-Core/api/gen/kilocenter/v1"
)

// server is the KiloCenter KC-Gateway gRPC endpoint.
var server = "localhost:9090"

func main() {
	conn, err := grpc.NewClient(server, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		log.Fatalf("failed to connect: %v", err)
	}
	defer conn.Close()

	client := kilocenterv1.NewKiloCenterServiceClient(conn)

	resp, err := client.GetSystemStatus(context.Background(), &emptypb.Empty{})
	if err != nil {
		log.Fatalf("GetSystemStatus failed: %v", err)
	}

	fmt.Printf("Version:            %s\n", resp.Version)
	fmt.Printf("Status:             %s\n", resp.Status)
	fmt.Printf("Uptime:             %s\n", resp.Uptime.AsTime())
	fmt.Printf("Active Endpoints:   %d\n", resp.ActiveEndpoints)
	fmt.Printf("Active Base Stations: %d\n", resp.ActiveBasestations)
	fmt.Printf("Messages Processed: %d\n", resp.MessagesProcessed)

	for _, svc := range resp.Services {
		fmt.Printf("  Service: %s  healthy=%v  latency=%dms\n", svc.Name, svc.Healthy, svc.LatencyMs)
	}
}
```

### List Endpoints

Lists registered endpoints with pagination support. High-volume profile: default page size 100, max 1000.

```go
package main

import (
	"context"
	"fmt"
	"log"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"

	kilocenterv1 "github.com/kilocenter/KC-Core/api/gen/kilocenter/v1"
)

var server = "localhost:9090"

func main() {
	conn, err := grpc.NewClient(server, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		log.Fatalf("failed to connect: %v", err)
	}
	defer conn.Close()

	client := kilocenterv1.NewKiloCenterServiceClient(conn)

	pageToken := ""
	pageSize := int32(100)

	for {
		resp, err := client.ListEndPoints(context.Background(), &kilocenterv1.ListEndPointsRequest{
			PageSize:  pageSize,
			PageToken: pageToken,
		})
		if err != nil {
			log.Fatalf("ListEndPoints failed: %v", err)
		}

		fmt.Printf("Total endpoints: %d\n", resp.TotalCount)

		for _, ep := range resp.Endpoints {
			fmt.Printf("  EUI: %s  Name: %s  Status: %s  Class: %s\n",
				ep.EpEui, ep.Name, ep.Status, ep.EpClass)
		}

		if resp.NextPageToken == "" {
			break
		}
		pageToken = resp.NextPageToken
	}
}
```

### Authentication

#### Community Edition

Community Edition runs single-tenant with organization enforcement off, so the examples above need only the `authorization` header: sign in with `Login` and send `Bearer <access_token>`. Each call also needs a role: `GetSystemStatus` is open to every role, `ListEndPoints` to Endpoint Managers and administrators. See [User Roles and Permissions](/kilo-mioty-service-center/security/users-and-roles.md).

#### Enterprise: JWT User Principal

Requires three headers: `authorization`, `x-organization-id`, and `x-user-id`. The `x-user-id` value must match the authenticated user in the JWT. Missing `x-user-id` returns `ErrTokenUserIDHeaderRequired`; a mismatch returns `ErrTokenIdentityMismatch`.

```go
import "google.golang.org/grpc/metadata"

token := "your-jwt-token"
orgID := "your-organization-uuid"
userID := "your-user-uuid"

ctx := metadata.AppendToOutgoingContext(context.Background(),
	"authorization", "Bearer "+token,
	"x-organization-id", orgID,
	"x-user-id", userID,
)

resp, err := client.ListEndPoints(ctx, &kilocenterv1.ListEndPointsRequest{
	PageSize: 100,
})
```

#### Enterprise: Service-Account API Key

Requires two headers: `authorization` and `x-organization-id`. Do **not** send `x-user-id` — including it returns `ErrTokenIdentityMismatch` to prevent user injection.

A service-account key acts as a Base Station Manager and Endpoint Manager in the organization it was created for, so the call below succeeds for that organization. Calls that need the Admin or Tenant Manager role, and any call for another organization, return `PERMISSION_DENIED`.

```go
apiKey := "your-api-key"
orgID := "your-organization-uuid"

ctx := metadata.AppendToOutgoingContext(context.Background(),
	"authorization", "Bearer "+apiKey,
	"x-organization-id", orgID,
)

resp, err := client.ListEndPoints(ctx, &kilocenterv1.ListEndPointsRequest{
	PageSize: 100,
})
```


---

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