esp_claim: Add support for "Assisted Claiming"

This is specifically for simplifying ESP32 claiming workflow,
wherein the phone apps will assist the node for claiming during
Wi-Fi provisioning. There would be no need of using CLI for claiming.

This will work only for BLE provisioning, as internet connectivity
will be required for claiming, and it may not be possible with
SoftAP.

Author: shahpiyushv

components/esp_rainmaker/CMakeLists.txt

@@ -12,6 +12,12 @@ set(core_srcs "src/core/esp_rmaker_core.c"
         "src/core/esp_rmaker_utils.c"
         "src/core/esp_rmaker_user_mapping.c")
 
+
+if(CONFIG_ESP_RMAKER_ASSISTED_CLAIM)
+    list(APPEND core_srcs
+        "src/core/esp_rmaker_claim.c"
+        "src/core/esp_rmaker_claim.pb-c.c")
+endif()
 if(CONFIG_ESP_RMAKER_SELF_CLAIM)
     list(APPEND core_srcs
         "src/core/esp_rmaker_claim.c")

components/esp_rainmaker/Kconfig.projbuild

@@ -15,9 +15,19 @@ menu "ESP RainMaker Config"
         help
             ESP RainMaker Claiming Service Base URL.
 
+    config ESP_RMAKER_ASSISTED_CLAIM
+        bool "Use Assisted Claiming"
+        depends on IDF_TARGET_ESP32 && BT_ENABLED
+        select MBEDTLS_HARDWARE_MPI
+        default y
+        help
+            Use Assisted Claiming i.e. get the MQTT credentials
+            from the claiming service via assistance from clients,
+            like the phone apps.
+
     config ESP_RMAKER_MQTT_HOST
         string "ESP RainMaker MQTT Host"
-        depends on ESP_RMAKER_SELF_CLAIM
+        depends on ESP_RMAKER_SELF_CLAIM || ESP_RMAKER_ASSISTED_CLAIM
         default "a1p72mufdu6064-ats.iot.us-east-1.amazonaws.com"
         help
             ESP RainMaker MQTT Host name.

components/esp_rainmaker/component.mk

@@ -2,8 +2,11 @@ COMPONENT_SRCDIRS := src/core src/mqtt src/ota src/standard_types src/console
 COMPONENT_ADD_INCLUDEDIRS := include
 COMPONENT_PRIV_INCLUDEDIRS := src/core src/ota src/console
 
+ifndef CONFIG_ESP_RMAKER_ASSISTED_CLAIM
+COMPONENT_OBJEXCLUDE += src/core/esp_rmaker_claim.pb-c.o
 ifndef CONFIG_ESP_RMAKER_SELF_CLAIM
     COMPONENT_OBJEXCLUDE += src/core/esp_rmaker_claim.o
 endif
+endif
 
 COMPONENT_EMBED_TXTFILES := server_certs/mqtt_server.crt server_certs/claim_service_server.crt server_certs/ota_server.crt