64 lines
2 KiB
Markdown
64 lines
2 KiB
Markdown
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# CoAP server example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This CoAP server example is adaptation of one of the [libcoap](https://github.com/obgm/libcoap) example.
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CoAP server example would startup a daemon task, receive data from CoAP client and transmit data to CoAP client.
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The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things.
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The protocol is designed for machine-to-machine (M2M) applications such as smart energy and building automation.
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Please refer to [RFC7252](https://www.rfc-editor.org/rfc/pdfrfc/rfc7252.txt.pdf) for more details.
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## How to use example
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### Configure the project
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```
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make menuconfig
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```
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* Set default serial port under Serial Flasher config
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* Set WiFi SSID under Example Configuration
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* Set WiFi Password under Example Configuration
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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make -j4 flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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current CoAP server would startup a daemon task,
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and the log is such as the following:
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```
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...
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I (332) wifi: mode : sta (30:ae:a4:04:1b:7c)
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I (1672) wifi: n:11 0, o:1 0, ap:255 255, sta:11 0, prof:1
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I (1672) wifi: state: init -> auth (b0)
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I (1682) wifi: state: auth -> assoc (0)
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I (1692) wifi: state: assoc -> run (10)
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I (1692) wifi: connected with huawei_cw, channel 11
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I (1692) wifi: pm start, type: 1
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I (2622) event: sta ip: 192.168.3.84, mask: 255.255.255.0, gw: 192.168.3.1
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I (2622) CoAP_server: Connected to AP
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E (7622) CoAP_server: select timeout
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E (12622) CoAP_server: select timeout
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E (17622) CoAP_server: select timeout
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...
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```
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if a CoAP client query `/Espressif` resource, CoAP server would return `"Hello World!"`
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## Troubleshooting
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* Please make sure CoAP client fetchs data under path: `/Espressif`
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