LwM2M Execute Request Not Actioning

In this tutorial, you'll learn about LwM2M Execute Request Not Actioning. We cover key concepts, practical examples, and best practices.

The Problem

LwM2M server execute request on a client resource does not trigger the action.

Quick Fix

Wrong

// Execute handler returns immediately without performing action

Server reports success but no action occurred.

Right

# Anjay execute handler
#include <anjay/anjay.h>

static int reboot_exec(
  anjay_t *anjay, const anjay_rid_t *rid,
  anjay_execute_ctx_t *ctx) {
  
  // Read optional arguments (LwM2M 1.1)
  char arg[64];
  size_t len = anjay_exec_get_args(ctx, arg, sizeof(arg));
  if (len > 0) {
    printf('Execute with args: %s\n', arg);
  }
  
  // Schedule reboot (must not block here!)
  anjay_sched_delayed(anjay, 100, NULL, do_reboot);
  
  return 0;  # Success — 2.04 Changed
}

# Resource definition
# {
#   'id': 4,
#   'name': 'Reboot',
#   'operations': 'E',
#   'type': ''
# }

# Resource must have 'E' in operations
# 'operations': 'E'  or  'operations': 'RWE'

Device reboots 100ms after execute request. Server receives 2.04 Changed.

Prevention

Execute handler must NOT block — it runs in the main event loop. Schedule delayed actions for long operations. Resources must have 'E' (Executable) in operations. Arguments are optional, defined by the resource specification. Return 0 for accepted, error code for rejection.

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

FAQ