Receive multicast packets with AT + CIPSTART

akarg96
Posts: 5
Joined: Wed Nov 27, 2019 2:49 am

Receive multicast packets with AT + CIPSTART

Postby akarg96 » Thu Feb 13, 2020 6:20 am

I have a question about UDP multicast.
Execute AT + CIPSTART = "UDP", "192.168.0.2", 0, 12345, 2 and OK will be displayed on the serial monitor. When I send UDP packets with PacketSender, + IPD, 5, hello is displayed.
When AT + CIPSTART = "UDP", "239.192.1.2", 0, 12345, 2 is executed, the serial monitor displays OK, and it is considered that the socket was correctly created. However, the PacketSender does not display + IPD when sending UDP packets to a multicast address.
Does AT firmware not support multicast?
Also, I don't want to use AT + MDNS.

I use google translation.
Thank you.

Helen L
Posts: 51
Joined: Thu Aug 16, 2018 9:07 am

Re: Receive multicast packets with AT + CIPSTART

Postby Helen L » Thu Feb 13, 2020 11:19 am

It seems that ESP32 AT does not support multicast for now, maybe it should be added in the future.

xcguang
Posts: 13
Joined: Fri Aug 31, 2018 7:34 am

Re: Receive multicast packets with AT + CIPSTART

Postby xcguang » Mon Feb 24, 2020 11:00 am

Please try it again using the attachment
Attachments
esp-at.bin.zip
(861.68 KiB) Downloaded 57 times

akarg96
Posts: 5
Joined: Wed Nov 27, 2019 2:49 am

Re: Receive multicast packets with AT + CIPSTART

Postby akarg96 » Tue Feb 25, 2020 12:52 am

Thanks Helen L and xcguang.
I understand that ESP-AT does not support multicast.
Using the given bin file, the AT + CIPSTART command definitely received the multicast.

xcguang
Posts: 13
Joined: Fri Aug 31, 2018 7:34 am

Re: Receive multicast packets with AT + CIPSTART

Postby xcguang » Wed Feb 26, 2020 3:34 am

Hi akarg96,
thanks for your feedback, we will sync at GitHub ASAP, if you have any question about esp-at, you can report it at https://github.com/espressif/esp-at/issues

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