LwM2M Server Object Instance Not Created

In this tutorial, you'll learn about LwM2M Server Object Instance Not Created. We cover key concepts, practical examples, and best practices.

The Problem

LwM2M Server Object (ID 1) instance is not created, preventing registration.

Quick Fix

Wrong

anjay_security_object_install(anjay);
// Server object not installed — registration fails```

Client starts but cannot register. Server object missing.

### Right

```cpp
#include <anjay/anjay.h>
#include <anjay/server.h>

int main(void) {
  const anjay_configuration_t config = {
    .endpoint_name = "urn:dev:001:sensor",
    .in_buffer_size = 4000,
    .out_buffer_size = 4000
  };
  anjay_t *anjay = anjay_new(&config);

  // Install both Security and Server objects
  anjay_security_object_install(anjay);
  anjay_server_object_install(anjay);

  // Create Server Object Instance (ID 0)
  // Short Server ID (matches Security Object), lifetime, default MIN period
  anjay_server_add_instance(anjay, 0, 86400);

  // Security instance links to server
  anjay_security_add_instance(anjay, 0, true,
    "coap://lwm2m-server:5683", false, NULL);

  anjay_start(anjay);
}```

Server Object instance created. Client registers with server successfully.

## Prevention

LwM2M Server Object (ID 1) is mandatory for all LwM2M clients. It contains: Short Server ID, Lifetime (registration period), Default Minimum Period, Default Maximum Period, Disable Timeout, Notification Storing (Queue Mode). Without it, the client cannot register. The Security Object (ID 0) must reference the same Short Server ID.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

## FAQ

<details style="margin-bottom:12px;border:1px solid #e2e8f0;border-radius:10px;overflow:hidden"><summary style="cursor:pointer;padding:14px 18px;font-weight:600;font-size:1.05rem;background:#f8fafc;border-bottom:1px solid #e2e8f0;color:#1e293b">### Is Server Object mandatory?</summary><div style="padding:14px 18px;color:#475569;line-height:1.7;background:#fff"><p>Yes. Every LwM2M client must implement Object ID 1. It defines how the client interacts with the LwM2M server.</p>
<h3 id="what-resources-are-required">What resources are required?</h3><p>Short Server ID (1), Lifetime (2), Default Min Period (3), Default Max Period (4), Disable (5), Disable Timeout (6), Notification Storing (7).</p>
<h3 id="can-i-have-multiple-server-instances">Can I have multiple server instances?</h3><p>Yes. Multiple instances allow connection to multiple LwM2M servers. Each needs its own Security Object instance.</p>
</div></details>