Storage intération downlink fail Can't do push windows form

Application Development
6

did some simplification and add a response.

i finaly did it!!!
This code send hello word to my lora anttena

private async void ALARMEPIQUET_Click(object sender, EventArgs e)
        {           
            string payload = "SGVsbG8gV29ybGQ="; // Payload base64
            int port = 1; // Port 
            bool confirmed = false; // downlink  confirm

            string downlinkUrl = $"https://eu1.cloud.thethings.network/api/v3/as/applications/XXX-test/devices/eui-XXXXX/down/push";

            var downlinkPayload = new
            {
                downlinks = new[]
                {
                new
                {
                    frm_payload = payload,
                    f_port = port,
                    confirmed = confirmed
                }
            }
            };

            var json = Newtonsoft.Json.JsonConvert.SerializeObject(downlinkPayload);
            var content = new StringContent(json, Encoding.UTF8, "application/json");

            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", apikey);
            var response = await client.PostAsync(downlinkUrl, content);

            if (response.IsSuccessStatusCode)
            {
                string responseData = await response.Content.ReadAsStringAsync();
                MessageBox.Show("Downlink message sent successfully. Response: " + responseData);
            }
            else
            {
                MessageBox.Show("Failed to send downlink message. Status Code: " + response.StatusCode);
            }
        }