esp-idf/tools/test_apps/protocols/pppos/README.md

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# PPP over Serial test
Testing connection of PPP client (ESP) to PPP server (raspberry pi)
## Pin Assignment
| ESP | rpi |
| ------ | -------------- |
| GPIO25 | UART-RX |
| GPIO26 | UART-TX |
| GND | GND |
## Test workflow
* Starts PPP server on a linux host
* Starts PPPoS client on ESP board
* Connects with both IPv4 and IPv6
* Test IPv6 connection
- Start server on ESP
- Have linux host to connect and exchange some data
* Test IPv4 connection
- Start server on linux host
- Connect with ESP to the server and exchange some data
* Pass/fail
## Manual test
### Server side
```
sudo pppd /dev/ttyAMA0 115200 CONFIG_TEST_APP_PPP_SERVER_IP:TEST_APP_PPP_CLIENT_IP modem local noauth debug nodetach dump nocrtscts
```
or with `+ipv6` to support ipv6 assignment
### IPv6 test
Connect to the ESP local link address and send data, e.g.
```
nc fe80::74d7:edc5:9907:5457 2222
```
### IPv4 tst
Server side expects to run tcp server on port 2222
```
nc -l 2222
```
## Test environment
configuration `Example_PPP` see wikis/test-docs/example-test-env#example_ppp