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doc: add CoAP README.md

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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](https://github.com/obgm/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](https://www.rfc-editor.org/rfc/pdfrfc/rfc7252.txt.pdf) 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.
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=192.168.3.84
Received: Hello World!
E (8102) CoAP_client: select timeout
E (13102) CoAP_client: select timeout
...
```
## Troubleshooting
* Please make sure Target Url includes valid `host`, `port`, `path`, and begins with `coap://`

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# CoAP server example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This CoAP server example is adaptation of one of the [libcoap](https://github.com/obgm/libcoap) example.
CoAP server example would startup a daemon task, receive data from CoAP client and transmit data to CoAP client.
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](https://www.rfc-editor.org/rfc/pdfrfc/rfc7252.txt.pdf) for more details.
## How to use example
### Configure the project
```
make menuconfig
```
* Set default serial port under Serial Flasher config
* 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
current CoAP server would startup a daemon task,
and the log is such as the following:
```
...
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 (2622) event: sta ip: 192.168.3.84, mask: 255.255.255.0, gw: 192.168.3.1
I (2622) CoAP_server: Connected to AP
E (7622) CoAP_server: select timeout
E (12622) CoAP_server: select timeout
E (17622) CoAP_server: select timeout
...
```
if a CoAP client query `/Espressif` resource, CoAP server would return `"Hello World!"`
## Troubleshooting
* Please make sure CoAP client fetchs data under path: `/Espressif`