# Provisioning for Arduino

This sketch implements provisioning using various IDF components

# Description

This example allows Arduino user to choose either BLE or SOFTAP as a 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).

# APIs introduced for provisioning

## WiFi.onEvent()

Using this API user can register to receive WiFi Events and Provisioning Events

#### Parameters passed

A function with following signature
* void SysProvEvent(system_event_t * , wifi_prov_event_t * );
 
#### structure [ wifi_prov_event_t ]

* wifi_prov_cb_event_t event;
* void * event_data;

## WiFi.beginProvision()

WiFi.beginProvision(scheme prov_scheme, wifi_prov_scheme_event_handler_t scheme_event_handler, wifi_prov_security_t security, char * pop, char * service_name, char * service_key, uint8_t * uuid);

#### Parameters passed

* prov_scheme : choose the mode of transfer
    * WIFI_PROV_SCHEME_BLE - Using BLE
    * WIFI_PROV_SCHEME_SOFTAP - Using SoftAP
        
* security : choose security type
    * WIFI_PROV_SECURITY_1 - It allows secure communication which consists of secure handshake using key exchange and proof of possession (pop) and encryption/decryption of messages.

    * WIFI_PROV_SECURITY_0 - It do not provide application level security, it involve simply plain text communication.

* scheme_event_handler : specify the handlers according to the mode chosen
    * BLE :
        - WIFI_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BTDM - This scheme event handler is used when application doesn't need BT and BLE after provisioning is finised
        - WIFI_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BLE - This scheme event handler is used when application doesn't need BLE to be active after provisioning is finised
        - WIFI_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BT - This scheme event handler is used when application doesn't need BT to be active after provisioning is finised

    * SoftAp :
        - WIFI_PROV_EVENT_HANDLER_NONE

* pop : It is the string that is used to provide the authentication.

* service_name : Specify service name for the device, if it is not specified then default chosen name via SoftAP is WIFI_XXX and via BLE is BLE_XXX where XXX are the last 3 bytes of the MAC address. 

* service_key : Specify service key, if chosen mode of provisioning is BLE then service_key is always NULL

* uuid : user can specify there own 128 bit UUID while provisioning using BLE, if not specified then default value taken is
        - {  0xb4, 0xdf, 0x5a, 0x1c, 0x3f, 0x6b, 0xf4, 0xbf,
             0xea, 0x4a, 0x82, 0x03, 0x04, 0x90, 0x1a, 0x02, }

# NOTE

* If none of the parameters are specified in beginProvision then default provisioning takes place using SoftAP with
    * scheme = WIFI_PROV_SCHEME_SOFTAP
    * scheme_event_handler = WIFI_PROV_EVENT_HANDLER_NONE
    * security = WIFI_PROV_SECURITY_1
    * pop = "abcd1234"
    * service_name = "WiFi_XXX"
    * service_key = NULL
    * uuid = NULL

# Log Output
* Enable debuger : [ Tools -> Core Debug Level -> Info ] 

# Provisioning Tools
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/provisioning/wifi_provisioning.html#provisioning-tools

# Example output

## Provisioning using SoftAP

```
[I][WiFiProv.cpp:117] beginProvision(): Starting AP using SOFTAP
 service_name : WIFI_XXX
 password : 123456789
 pop : abcd1234

Provisioning started
Give Credentials of your access point using " Android app "

Received Wi-Fi credentials
	SSID : GIONEE M2
	Password : 123456789

Connected IP address : 192.168.43.120
Provisioning Successful
Provisioning Ends

```

## Provisioning using BLE

```
[I][WiFiProv.cpp:115] beginProvision(): Starting AP using BLE
 service_name : BLE_XXX
 pop : abcd1234

Provisioning started
Give Credentials of your access point using " Android app "

Received Wi-Fi credentials
	SSID : GIONEE M2
	Password : 123456789

Connected IP address : 192.168.43.120
Provisioning Successful
Provisioning Ends

```

## Credentials are available on device

```
[I][WiFiProv.cpp:125] beginProvision(): Aleardy Provisioned, starting Wi-Fi STA
[I][WiFiProv.cpp:126] beginProvision(): CONNECTING ACCESS POINT CREDENTIALS : 
[I][WiFiProv.cpp:126] beginProvision(): SSID : GIONEE M2

```