61923d37b6
Other changes: * Command line argument name and descriptions updated and formatted * Some exception messages updated for clarity * READMEs updated for tool and all provisioning examples * Minor update in example test scripts due to change in esp_prov.get_transport() API * Transport_HTTP now forces connect on initialization
265 lines
12 KiB
Markdown
265 lines
12 KiB
Markdown
# Wi-Fi Provisioning Manager 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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`wifi_prov_mgr` example demonstrates the usage of `wifi_provisioning` manager component for building a provisioning application.
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For this example BLE is chosen as the mode of transport, over which the provisioning related communication is to take place, between the device (to be provisioned) and the client (owner of the device).
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In the provisioning process the device is configured as a Wi-Fi station with specified credentials. Once configured, the device will retain the Wi-Fi configuration, until a flash erase is performed.
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Right after provisioning is complete, BLE is turned off and disabled to free the memory used by the BLE stack. Though, that is specific to this example, and the user can choose to keep BLE stack intact in their own application.
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`wifi_prov_mgr` uses the following components :
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* `wifi_provisioning` : provides manager, data structures and protocomm endpoint handlers for Wi-Fi configuration
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* `protocomm` : for protocol based communication and secure session establishment
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* `protobuf` : Google's protocol buffer library for serialization of protocomm data structures
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* `bt` : ESP32 BLE stack for transport of protobuf packets
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This example can be used, as it is, for adding a provisioning service to any application intended for IoT.
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## How to use example
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### Hardware Required
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Example should be able to run on any commonly available ESP32 development board.
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### Application Required
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Provisioning applications are available for various platforms. See below
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#### Platform : Android
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For Android, a provisioning application along with source code is available on GitHub : [esp-idf-provisioning-android](https://github.com/espressif/esp-idf-provisioning-android)
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#### Platform : iOS
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For iOS, a provisioning application along with source code is available on GitHub : [esp-idf-provisioning-ios](https://github.com/espressif/esp-idf-provisioning-ios)
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#### Platform : Linux / Windows / macOS
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To provision the device running this example, the `esp_prov.py` script needs to be run (found under `$IDF_PATH/tools/esp_prov`). Make sure to satisfy all the dependencies prior to running the script.
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Presently, `esp_prov` supports BLE transport only for Linux platform. For Windows/macOS it falls back to console mode and requires another application (for BLE) through which the communication can take place.
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There are various applications, specific to Windows and macOS platform which can be used. The `esp_prov` console will guide you through the provisioning process of locating the correct BLE GATT services and characteristics, the values to write, and input read values.
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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 serial port under Serial Flasher Options.
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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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```
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I (445) app: Starting provisioning
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I (1035) app: Provisioning started
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I (1045) wifi_prov_mgr: Provisioning started with service name : PROV_261FCC
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```
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Make sure to note down the BLE device name (starting with `PROV_`) displayed in the serial monitor log (eg. PROV_261FCC). This will depend on the MAC ID and will be unique for every device.
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In a separate terminal run the `esp_prov.py` script under `$IDP_PATH/tools/esp_prov` directory (make sure to replace `myssid` and `mypassword` with the credentials of the AP to which the device is supposed to connect to after provisioning). Assuming default example configuration, which uses protocomm security scheme 1 and proof of possession PoP based authentication :
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```
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python esp_prov.py --transport ble --service_name PROV_261FCC --sec_ver 1 --pop abcd1234 --ssid myssid --passphrase mypassword
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```
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Above command will perform the provisioning steps, and the monitor log should display something like this :
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```
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I (39725) app: Received Wi-Fi credentials
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SSID : myssid
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Password : mypassword
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.
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.
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.
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I (45335) tcpip_adapter: sta ip: 192.168.43.243, mask: 255.255.255.0, gw: 192.168.43.1
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I (45345) app: Provisioning successful
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I (45345) app: Connected with IP Address:192.168.43.243
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I (46355) app: Hello World!
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I (47355) app: Hello World!
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I (48355) app: Hello World!
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I (49355) app: Hello World!
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.
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.
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.
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I (52315) wifi_prov_mgr: Provisioning stopped
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.
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.
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.
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I (52355) app: Hello World!
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I (53355) app: Hello World!
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I (54355) app: Hello World!
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I (55355) app: Hello World!
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```
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### Wi-Fi Scanning
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Provisioning manager also supports providing real-time Wi-Fi scan results (performed on the device) during provisioning. This allows the client side applications to choose the AP for which the device Wi-Fi station is to be configured. Various information about the visible APs is available, like signal strength (RSSI) and security type, etc. Also, the manager now provides capabilities information which can be used by client applications to determine the security type and availability of specific features (like `wifi_scan`).
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When using the scan based provisioning, we don't need to specify the `--ssid` and `--passphrase` fields explicitly:
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```
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python esp_prov.py --transport ble --service_name PROV_261FCC --pop abcd1234
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```
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See below the sample output from `esp_prov` tool on running above command:
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```
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Connecting...
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Connected
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Getting Services...
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Security scheme determined to be : 1
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==== Starting Session ====
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==== Session Established ====
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==== Scanning Wi-Fi APs ====
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++++ Scan process executed in 1.9967520237 sec
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++++ Scan results : 5
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++++ Scan finished in 2.7374596596 sec
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==== Wi-Fi Scan results ====
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S.N. SSID BSSID CHN RSSI AUTH
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[ 1] MyHomeWiFiAP 788a20841996 1 -45 WPA2_PSK
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[ 2] MobileHotspot 7a8a20841996 11 -46 WPA2_PSK
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[ 3] MyHomeWiFiAP 788a208daa26 11 -54 WPA2_PSK
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[ 4] NeighborsWiFiAP 8a8a20841996 6 -61 WPA2_PSK
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[ 5] InsecureWiFiAP dca4caf1227c 7 -74 Open
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Select AP by number (0 to rescan) : 1
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Enter passphrase for MyHomeWiFiAP :
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==== Sending Wi-Fi credential to esp32 ====
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==== Wi-Fi Credentials sent successfully ====
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==== Applying config to esp32 ====
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==== Apply config sent successfully ====
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==== Wi-Fi connection state ====
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++++ WiFi state: connected ++++
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==== Provisioning was successful ====
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```
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## Troubleshooting
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### Provisioning failed
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It is possible that the Wi-Fi credentials provided were incorrect, or the device was not able to establish connection to the network, in which the the `esp_prov` script will notify failure (with reason). Serial monitor log will display the failure along with disconnect reason :
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```
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E (367015) app: Provisioning failed!
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Reason : Wi-Fi AP password incorrect
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Please reset to factory and retry provisioning
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```
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Once credentials have been applied, even though wrong credentials were provided, the device will no longer go into provisioning mode on subsequent reboots until NVS is erased (see following section).
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### Provisioning does not start
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If the serial monitor log shows the following :
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```
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I (465) app: Already provisioned, starting Wi-Fi STA
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```
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it means either the device has been provisioned earlier with or without success (e.g. scenario covered in above section), or that the Wi-Fi credentials were already set by some other application flashed previously onto your device. On setting the log level to DEBUG this is clearly evident :
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```
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D (455) wifi_prov_mgr: Found Wi-Fi SSID : myssid
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D (465) wifi_prov_mgr: Found Wi-Fi Password : m********d
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I (465) app: Already provisioned, starting Wi-Fi STA
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```
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To fix this we simple need to erase the NVS partition from flash. First we need to find out its address and size. This can be seen from the monitor log on the top right after reboot.
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```
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I (47) boot: Partition Table:
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I (50) boot: ## Label Usage Type ST Offset Length
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I (58) boot: 0 nvs WiFi data 01 02 00009000 00006000
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I (65) boot: 1 phy_init RF data 01 01 0000f000 00001000
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I (73) boot: 2 factory factory app 00 00 00010000 00124f80
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I (80) boot: End of partition table
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```
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Now erase NVS partition by running the following commands :
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```
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$IDF_PATH/components/esptool_py/esptool/esptool.py erase_region 0x9000 0x6000
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```
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### Unsupported platform
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If the platform requirement, for running `esp_prov` is not satisfied, then the script execution will fallback to console mode, in which case the full process (involving user inputs) will look like this :
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```
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==== Esp_Prov Version: v1.0 ====
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BLE client is running in console mode
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This could be due to your platform not being supported or dependencies not being met
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Please ensure all pre-requisites are met to run the full fledged client
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BLECLI >> Please connect to BLE device `PROV_261FCC` manually using your tool of choice
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BLECLI >> Was the device connected successfully? [y/n] y
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BLECLI >> List available attributes of the connected device
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BLECLI >> Is the service UUID '0000ffff-0000-1000-8000-00805f9b34fb' listed among available attributes? [y/n] y
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BLECLI >> Is the characteristic UUID '0000ff53-0000-1000-8000-00805f9b34fb' listed among available attributes? [y/n] y
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BLECLI >> Is the characteristic UUID '0000ff51-0000-1000-8000-00805f9b34fb' listed among available attributes? [y/n] y
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BLECLI >> Is the characteristic UUID '0000ff52-0000-1000-8000-00805f9b34fb' listed among available attributes? [y/n] y
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==== Verifying protocol version ====
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BLECLI >> Write following data to characteristic with UUID '0000ff53-0000-1000-8000-00805f9b34fb' :
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>> 56302e31
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 53554343455353
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==== Verified protocol version successfully ====
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==== Starting Session ====
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BLECLI >> Write following data to characteristic with UUID '0000ff51-0000-1000-8000-00805f9b34fb' :
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>> 10015a25a201220a20ae6d9d5d1029f8c366892252d2d5a0ffa7ce1ee5829312545dd5f2aba057294d
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 10015a390801aa0134122048008bfc365fad4753dc75912e0c764d60749cb26dd609595b6fbc72e12614031a1089733af233c7448e7d7fb7963682c6d8
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BLECLI >> Write following data to characteristic with UUID '0000ff51-0000-1000-8000-00805f9b34fb' :
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>> 10015a270802b2012212204051088dc294fe4621fac934a8ea22e948fcc3e8ac458aac088ce705c65dbfb9
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 10015a270803ba01221a20c8d38059d5206a3d92642973ac6ba8ac2f6ecf2b7a3632964eb35a0f20133adb
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==== Session Established ====
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==== Sending Wifi credential to esp32 ====
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BLECLI >> Write following data to characteristic with UUID '0000ff52-0000-1000-8000-00805f9b34fb' :
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>> 98471ac4019a46765c28d87df8c8ae71c1ae6cfe0bc9c615bc6d2c
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 3271f39a
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==== Wifi Credentials sent successfully ====
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==== Applying config to esp32 ====
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BLECLI >> Write following data to characteristic with UUID '0000ff52-0000-1000-8000-00805f9b34fb' :
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>> 5355
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 1664db24
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==== Apply config sent successfully ====
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==== Wifi connection state ====
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BLECLI >> Write following data to characteristic with UUID '0000ff52-0000-1000-8000-00805f9b34fb' :
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>> 290d
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BLECLI >> Enter data read from characteristic (in hex) :
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<< 505f72a9f8521025c1964d7789c4d7edc56aedebd144e1b667bc7c0975757b80cc091aa9f3e95b06eaefbc30290fa1
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++++ WiFi state: connected ++++
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==== Provisioning was successful ====
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```
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The write data is to be copied from the console output ```>>``` to the platform specific application and the data read from the application is to be pasted at the user input prompt ```<<``` of the console, in the format (hex) indicated in above sample log.
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