# ESP Local Control using HTTPS server This example creates a `esp_local_ctrl` service over HTTPS transport, for securely controlling the device over local network. In this case the device name is resolved through `mDNS`, which in this example is `my_esp_ctrl_device.local`. See the `esp_local_ctrl` component documentation for details. Before using the example, run `idf.py menuconfig` (or `idf.py menuconfig` if using CMake build system) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../README.md) for more details. ## Client Side Implementation A python test script `scripts/esp_local_ctrl.py` has been provided for as a client side application for controlling the device over the same Wi-Fi network. The script relies on a pre-generated `main/certs/rootCA.pem` to verify the server certificate. The server side private key and certificate can also be found under `main/certs`, namely `prvtkey.pem` and `cacert.pem`. After configuring the Wi-Fi, flashing and booting the device, run the following command to test the device name resolution through mDNS: ``` ping my_esp_ctrl_device.local ``` Sample output: ``` 64 bytes from 192.168.32.156 (192.168.32.156): icmp_seq=1 ttl=255 time=58.1 ms 64 bytes from 192.168.32.156 (192.168.32.156): icmp_seq=2 ttl=255 time=89.9 ms 64 bytes from 192.168.32.156 (192.168.32.156): icmp_seq=3 ttl=255 time=123 ms ``` After you've tested the name resolution, run: ``` python scripts/esp_local_ctrl.py ``` Sample output: ``` python scripts/esp_local_ctrl.py ==== Acquiring properties information ==== ==== Acquired properties information ==== ==== Available Properties ==== S.N. Name Type Flags Value [ 1] timestamp (us) TIME(us) Read-Only 168561481 [ 2] property1 INT32 123456 [ 3] property2 BOOLEAN Read-Only True [ 4] property3 STRING Select properties to set (0 to re-read, 'q' to quit) : 0 ==== Available Properties ==== S.N. Name Type Flags Value [ 1] timestamp (us) TIME(us) Read-Only 22380117 [ 2] property1 INT32 123456 [ 3] property2 BOOLEAN Read-Only False [ 4] property3 STRING Select properties to set (0 to re-read, 'q' to quit) : 2,4 Enter value to set for property (property1) : -5555 Enter value to set for property (property3) : hello world! ==== Available Properties ==== S.N. Name Type Flags Value [ 1] timestamp (us) TIME(us) Read-Only 55110859 [ 2] property1 INT32 -5555 [ 3] property2 BOOLEAN Read-Only False [ 4] property3 STRING hello world! Select properties to set (0 to re-read, 'q' to quit) : q Quitting... ``` The script also allows to connect over BLE, and provide a custom service name. To display the list of supported parameters, run: ``` python scripts/esp_local_ctrl.py --help ``` ## Certificates You can generate a new server certificate using the OpenSSL command line tool. For the purpose of this example, lets generate a rootCA, which we will use to sign the server certificates and which the client will use to verify the server certificate during SSL handshake. You will need to set a password for encrypting the generated `rootkey.pem`. ``` openssl req -new -x509 -subj "/CN=root" -days 3650 -sha256 -out rootCA.pem -keyout rootkey.pem ``` Now generate a certificate signing request for the server, along with its private key `prvtkey.pem`. ``` openssl req -newkey rsa:2048 -nodes -keyout prvtkey.pem -days 3650 -out server.csr -subj "/CN=my_esp_ctrl_device.local" ``` Now use the previously generated rootCA to process the server's certificate signing request, and generate a signed certificate `cacert.pem`. The password set for encrypting `rootkey.pem` earlier, has to be entered during this step. ``` openssl x509 -req -in server.csr -CA rootCA.pem -CAkey rootkey.pem -CAcreateserial -out cacert.pem -days 500 -sha256 ``` Now that we have `rootCA.pem`, `cacert.pem` and `prvtkey.pem`, copy these into main/certs. Note that only the server related files (`cacert.pem` and `prvtkey.pem`) are embedded into the firmware. Expiry time and metadata fields can be adjusted in the invocation. Please see the `openssl` man pages (man `openssl-req`) for more details. It is **strongly recommended** to not reuse the example certificate in your application; it is included only for demonstration.