bc9d1a65d7
This takes the code up to the latest released version of libcoap. As there have been API changes, coap_client and coap_server in examples/protocols have been updated to use the new APIs. Further information on the new libcoap APIs can be found at https://libcoap.net/doc/reference/4.2.0/ coap_client has been updated to handle BLOCK2 responses from "coap://californium.eclipse.org" coap_client has been modified to only send out one request (and wait for the response) coap_server has been updated to support Observe subscriptions, and well as adding in PUT and DELETE handlers to work on the Espressif resource coap_server and coap_client have had their stack sizes increased. port/coap_io.c has been added, a copy of libcoap/src/coap_io.c with support added for systems that do not have RFC 3542 section 20 support. port/coap_io_socket.c has been removed as a lot of the code is now replicated in different libcoap files. Once this PR is place, then adding in DTLS will be a lot simpler (as a separate PR) Signed-off-by: Jitin George <jitin@espressif.com> Merges https://github.com/espressif/esp-idf/pull/3148
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CoAP client example
(See the README.md file in the upper level 'examples' directory for more information about examples.) this CoAP client example is adaptation of one of the libcoap example.
CoAP client example would connect your ESP32 device to any CoAP server, fetch data from CoAP server and upstream data to CoAP server.
The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things.
The protocol is designed for machine-to-machine (M2M) applications such as smart energy and building automation.
please refer to RFC7252 for more details.
How to use example
Configure the project
make menuconfig
- Set serial port under Serial Flasher config
- Set Target Uri under Example Configuration
- Set WiFi SSID under Example Configuration
- Set WiFi Password under Example Configuration
Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
make -j4 flash monitor
(To exit the serial monitor, type Ctrl-].)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
Example Output
Prerequisite: we startup a CoAP server on coap server example, or use the default of coap://californium.eclipse.org.
and you could receive data from CoAP server if succeed,
such as the following log:
...
I (332) wifi: mode : sta (30:ae:a4:04:1b:7c)
I (1672) wifi: n:11 0, o:1 0, ap:255 255, sta:11 0, prof:1
I (1672) wifi: state: init -> auth (b0)
I (1682) wifi: state: auth -> assoc (0)
I (1692) wifi: state: assoc -> run (10)
I (1692) wifi: connected with huawei_cw, channel 11
I (1692) wifi: pm start, type: 1
I (2582) event: sta ip: 192.168.3.89, mask: 255.255.255.0, gw: 192.168.3.1
I (2582) CoAP_client: Connected to AP
I (2582) CoAP_client: DNS lookup succeeded. IP=104.196.15.150
Received:
************************************************************
CoAP RFC 7252 Cf 2.0.0-SNAPSHOT
************************************************************
This server is using the Eclipse Californium (Cf) CoAP framework
published under EPL+EDL: http://www.eclipse.org/californium/
(c) 2014, 2015, 2016 Institute for Pervasive Computing, ETH Zurich and others
************************************************************
...
libcoap Documentation
This can be found at https://libcoap.net/doc/reference/4.2.0/
Troubleshooting
-
Please make sure Target Url includes valid
host, optionalport, optionalpath, and begins withcoap://orcoap+tcp://for a coap server that supports TCP (not all do including coap+tcp://californium.eclipse.org). -
libcoap logging can be increased by changing
#define COAP_LOGGING_LEVEL 0to#define COAP_LOGGING_LEVEL 9