Add RainMaker WiFI provisioning

[martinberlin]

Following examples of https://github.com/espressif/esp-rainmaker add WiFi provisioning in one branch.

It would be the Espressif alternative to send your WiFi credentials to your devices using Android and Iphone devices.

• Add all RainMaker required libraries
• Do a vector _buffer tests ( test/vector )
• Add some documentation

[martinberlin]

Note provisioning starts to work. But there is still an error in the provisioning process:

I (31038) app_wifi: Connected with IP Address:192.168.12.150
I (31038) esp_netif_handlers: sta ip: 192.168.12.150, mask: 255.255.255.0, gw: 192.168.12.1
I (31048) wifi_prov_mgr: STA Got IP
I (31048) app_wifi: Provisioning successful
I (31058) esp_mqtt_glue: Connecting to a1p72mufdu6064-ats.iot.us-east-1.amazonaws.com
I (31058) esp_mqtt_glue: Waiting for MQTT connection. This may take time.
E (34778) BT_SMP: smp_encrypt_data failed unable to allocate buffer

E (34778) BT_BTC: btc_gatts_cb_param_copy_req 2 no mem

I (40028) app_wifi: Disconnected. Connecting to the AP again...
E (40038) esp-tls-mbedtls: mbedtls_ssl_handshake returned -0x2880
E (40038) wifi_prov_mgr: STA Disconnected
I (40038) esp-tls-mbedtls: Certificate verified.
E (40038) wifi_prov_mgr: Disconnect reason : 200
E (40048) esp-tls: Failed to open new connection
E (40048) wifi:sta is connecting, return error
E (40058) TRANSPORT_BASE: Failed to open a new connection
E (40068) MQTT_CLIENT: Error transport connect
E (40068) esp_mqtt_glue: MQTT_EVENT_ERROR
W (40078) esp_mqtt_glue: MQTT Disconnected. Will try reconnecting in a while...

So it connects to WiFi but it does not get listed in the App as a device. The issue is that BLE needs RAM:
Gdew027w3 display(io); // Works

With more than 400*300 pixels display buffer an ESP32 without PSRAM it won't work. The WiFi is provisioned but the App stays in a "hanged state" if it does not complete the full process.

TODO:

• Make Test-Param to be stored on NVS as an uint8_t and decide how long to go deepsleep in minutes.
• Try Persist Flag: https://github.com/espressif/esp-rainmaker/blob/master/examples/gpio/main/app_main.c#L74

[martinberlin]

This was merged into this branch.
Vector continuation branch: https://github.com/martinberlin/cale-idf/tree/test/vector

[martinberlin]

This tickets needs more testing before closing it. Must say that I already shipped some devices built with this branch and it worked pretty good.
But it needs more documentation and also #50 should be implemented otherwise it works until someone decides to change their WiFi credentials and then it just keeps on hooked to the old WiFi.

[martinberlin]

Let’s reopen this after Espressif launches Rainmaker as a component