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feat(coap): Add coap multicast client and server example

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yuanjm
2020-11-19 19:26:38 +08:00
parent 877695eeb8
commit 549a1e77fa
7 changed files with 204 additions and 40 deletions
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24
examples/protocols/coap_client/README.md
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@@ -68,11 +68,33 @@ published under EPL+EDL: http://www.eclipse.org/californium/
...
```
You can use example coap_server together with coap_client example.
First, make coap_server and coap_client in the same local network by connecting to the same Wifi.
Then, configure the coap_client uri to `coap://232.10.11.12/Espressif ` or `coap://[ff02::fc]/Espressif`.
The coap_server will listen to ipv4 multicast ip address 232.10.11.12 and ipv6 multicast address ff02::fc.
You will see the following log:
```
...
I (468) example_connect: Connecting to HUAWEI_888...
I (1658) wifi:state: 0 -> 2 (b0)
I (1668) wifi:state: 2 -> 3 (0)
I (1675) wifi:state: 3 -> 5 (10)
I (1701) wifi:connected with HUAWEI_888, aid = 2, channel 1, HT20, bssid = 34:29:12:43:c5:40
I (3654) tcpip_adapter: sta ip: 192.168.3.3, mask: 255.255.255.0, gw: 192.168.3.1
I (3658) example_connect: Connected to HUAWEI_888
I (3662) example_connect: IPv4 address: 192.168.3.3
I (3671) example_connect: IPv6 address: fe80:0000:0000:0000:860d:8eff:fe9d:cd90
I (3684) CoAP_client: Resolve the IP address is IPV6, FF02::FC
Received: no data
...
```
## libcoap Documentation
This can be found at https://libcoap.net/doc/reference/4.2.0/
## Troubleshooting
* Please make sure Target Url includes valid `host`, optional `port`, optional `path`, and begins
* Please make sure Target Url includes valid `host` or `ip`, optional `port`, optional `path`, and begins
with `coap://` or `coap+tcp://` for a coap server that supports TCP
(not all do including coap+tcp://californium.eclipse.org).