ESP8266 Community Forum

Posted: **Sun Sep 21, 2014 5:48 pm**

They added DTLS after I was done working with COAP.

Here is an implementation:
http://tinydtls.sourceforge.net/

There may be another one inside of Contiki.

Posted: **Tue Sep 23, 2014 7:14 am**

Cool, thanks!

Posted: **Tue Feb 03, 2015 7:14 pm**

looks like a alternative to lwip lib ... bringing mdns and other mesh related advancements
http://www.esp8266.com/viewtopic.php?f=9&t=1495

Posted: **Thu Mar 05, 2015 12:40 pm**

In SDK 0.9.5 there are now two IGMP functions to support multicast UDP: (*Sorry...This may be a bit of a thread hijack but this part is on topic.)

Code: Select all

Sin8 espconn_igmp_join(ip_addr_t *host_ip, ip_addr_t *multicast_ip)
Sin8 espconn_igmp_leave(ip_addr_t *host_ip, ip_addr_t *multicast_ip)

I use JOIN like this...

Code: Select all

    uPnP_Con.pCon = (struct espconn *) os_zalloc(sizeof (struct espconn));
    uPnP_Con.pCon->type = ESPCONN_UDP;
    uPnP_Con.pCon->state = ESPCONN_NONE;

    uPnP_Con.pCon->proto.udp = (esp_udp *) os_zalloc(sizeof (esp_udp));

    uPnP_Con.pCon->proto.udp->local_port = 1900;

    uPnP_Con.pCon->proto.udp->remote_port = 1900;
    uPnP_Con.pCon->proto.udp->remote_ip[0] = 239;
    uPnP_Con.pCon->proto.udp->remote_ip[1] = 255;
    uPnP_Con.pCon->proto.udp->remote_ip[2] = 255;
    uPnP_Con.pCon->proto.udp->remote_ip[3] = 250;

    uPnP_Con.pCon->reverse = NULL;

    espconn_regist_recvcb(uPnP_Con.pCon, slip_uPnP_OnRecieve);   
    espconn_regist_sentcb(uPnP_Con.pCon, slip_uPnP_OnSendComplete);
    espconn_create(uPnP_Con.pCon); 

    IP4_ADDR(&uPnP_MulticastIP.ip, 239, 255, 255, 250);
    espconn_igmp_join(&LocalIP.ip, &uPnP_MulticastIP.ip);

At that point uPnP request come flying in on the "slip_uPnP_OnRecieve" callback with great success!

However, after that I have a problem when sending multicast packets... It seems that the espconn takes the last incoming UDP packet's source IP address and uses that as the RemoteIP for subsequent transmissions. That makes life suck... Before, when using 0.9.3 I could send multicast packets just fine, but had no way to Rx them.

Anyone else seeing this? Anyone else have a hint or solution?

Thanks!

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