<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Ahed<div class=""><br class=""><div><blockquote type="cite" class=""><div class=""><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;" class="">In a network scenario where every node is equipped with IEEE 802.15.4-based NDN:</span></div><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">1 - Is it possible to send a broadcast message (to send command or to advertise a service) to all the neighbor nodes.</div></div></div></blockquote><div>Yes, 802.15.4 MAC supports broadcast addressing. NDN packets can be transmitted over broadcast channel.</div><br class=""><blockquote type="cite" class=""><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">2- H<span style="font-size: 12pt;" class="">ow can I get information on how to structure a broadcast message.</span></div></div></div></blockquote><div>The main concern is that 802.15.4’s MTU is 127 octets. You may send regular Interests with NDNLPv2 fragmentation and reassembly, but each Interest would use many lower layer frames.</div><br class=""><blockquote type="cite" class=""><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">3- I have also read about "<span class="">extensible command markers" of CCNx which might use "<span class="">%C1.M.S.neighborhood" to broadcast a message/invoke services (correct me if I am wrong), does NDN has similar extension, and how to do it (a reference or example should help).</span></span></div></div></div></blockquote><div>The NDN equivalent of “extensible command markers” is <a href="https://redmine.named-data.net/issues/2012" class="">MarkedComponent</a>. It’s not yet approved and not implemented.</div></div><br class=""></div><div class="">Yours, Junxiao</div></body></html>