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Sending command response.

Hi
I have a general question about how to sending command response. I setup a  server OTA endpoint,
I receive the command but when sending the response it seams the client do not receive the response.
I have attached some sample code to illustrate what I am doing. I expect the next request
from the client to be a Image Block/Page request. But it keeps asking for the query next image.
Is there something basic that I am doing wrong ? 
/Jimmy
    if( hdr->is_common_command == 0 && hdr->cluster_id == ZB_ZCL_CLUSTER_ID_OTA_UPGRADE )
    {
        switch( hdr->cmd_id )
        {
            case ZB_ZCL_CMD_OTA_UPGRADE_QUERY_NEXT_IMAGE_ID:
            {
                zb_zcl_parse_status_t status;
                serial_query_next_cmd_t next_cmd;
                //---
                zb_zcl_ota_upgrade_query_next_image_res_t t;
                zb_zcl_status_t x;
                //---
                memset(&next_cmd, 0, sizeof(serial_query_next_cmd_t));
                ZB_ZCL_OTA_UPGRADE_GET_QUERY_NEXT_IMAGE_REQ(&next_cmd.s, buf, status);
                
                if (status == ZB_ZCL_PARSE_STATUS_SUCCESS) 
                {
                    zb_buf_t* obuf = zb_get_out_buf();
                    if (!obuf)
                    {
                        ZB_FREE_BUF_BY_REF(param);
                        return ZB_FALSE;
                    }

                    ZB_ZCL_OTA_UPGRADE_SEND_QUERY_NEXT_IMAGE_RES( obuf,
                                                  hdr->addr_data.common_data.source.u.short_addr,
                                                  ZB_ZCL_ADDR_TYPE_SHORT,
                                                  hdr->addr_data.common_data.src_endpoint,
                                                  1,
                                                  hdr->profile_id,
                                                  hdr->seq_number,
                                                  ZB_ZCL_STATUS_SUCCESS,
                                                  next_cmd.s.manufacturer,
                                                  next_cmd.s.image_type,
                                                  0x12221572,
                                                  173638);
   
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