claiming: Make self claiming as the default for esp32s3 and esp32c3

It was already the default for esp32s2. So, only esp32 will have
assisted claiming as default. This change was made because RainMaker
now supports admin roles even for Self Claimed nodes. Please check
CHANGES.md for details

Author: shahpiyushv

CHANGES.md

@@ -1,5 +1,32 @@
 # Changes
 
+## 26-May-2022 (claiming and ota)
+
+- claiming: Make self claiming as the default for esp32s3 and esp32c3
+- ota: Make "OTA using Topics" as default and provide a simplified API for that
+
+Self claiming is much more convenient and fast since the node directly gets the
+credentials from the claiming service over HTTPS, instead of using the slower BLE based
+Assisted claiming, wherein the phone app acts as a proxy between the node and the
+claiming service. However, with self claiming, there was no concept of
+[Admin Role](https://rainmaker.espressif.com/docs/user-roles.html#admin-users) and so, it was
+not possible to access the node via the RainMaker or Insights dashboards. This was one
+reason why Assisted Claiming was kept as a default for esp32c3 and esp32s3 even though
+they support self claiming.
+
+With recent changes in the Public RainMaker backend, the primary user (the user who performs the [user-node
+mapping](https://rainmaker.espressif.com/docs/user-node-mapping.html)) for a self claimed
+node is now made as the admin. This gives the primary user the access to the node for OTA and Insights.
+So, self claiming has now been made as the default for all chips (except esp32) and the OTA Using Topics
+has also been made as the default, since it is convenient and also the correct option for
+production devices. A simpler API `esp_rmaker_ota_enable_default()` as also been added in esp_rmaker_core.h.
+
+Note: Nodes that are already claimed via Assisted/Host Claiming will not have any effect, even if the
+new firmware is enabled with self claiming. The self claiming will take effect only if the flash is
+erased. **This will result in a change of node_id, since mac address is the node_id for self claimed nodes.**
+If you want to contine using Assisted Claiming (probably because there is quite some data associated
+with the node_id), please set is explicitly in your sdkconfig.
+
 ## 25-Jan-2022 (app_wifi: Minor feature additions to provisioning workflow)
 
 Added a 30 minute timeout for Wi-Fi provisioning as a security measure. A device reboot will be

components/esp_rainmaker/Kconfig.projbuild

@@ -2,8 +2,8 @@ menu "ESP RainMaker Config"
 
     choice ESP_RMAKER_CLAIM_TYPE
         bool "Claiming Type"
-        default ESP_RMAKER_SELF_CLAIM if IDF_TARGET_ESP32S2
-        default ESP_RMAKER_ASSISTED_CLAIM if !IDF_TARGET_ESP32S2
+        default ESP_RMAKER_SELF_CLAIM
+        default ESP_RMAKER_ASSISTED_CLAIM if IDF_TARGET_ESP32
         help
             Claiming type to be used.