wifi: Move Wi-Fi enterprise configs to a snippet

Instead of having an overlay move the Enterprise configurations to a
dedicated snippet so that it can be enabled with any sample.

Can be used along with Wi-Fi snippet e.g., `-S
"wifi-ipv4;wifi-enterprise"`.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

doc/connectivity/networking/api/wifi.rst

@@ -50,14 +50,7 @@ module.
     $ cp client2.pem samples/net/wifi/test_certs/
     $ cp client-key2.pem samples/net/wifi/test_certs/
     $ cp ca2.pem samples/net/wifi/test_certs/
-    $ west build -p -b <board> samples/net/wifi -- -DEXTRA_CONF_FILE=overlay-enterprise.conf
-
-For using variable size network buffer, the following overlay file can be used:
-
-.. code-block:: bash
-
-    $ west build -p -b <board> samples/net/wifi -- -DEXTRA_CONF_FILE=overlay-enterprise-variable-bufs.conf
-
+    $ west build -p -b <board> samples/net/wifi -S wifi-enterprise
 
 Run time certificates
 ---------------------

samples/net/wifi/shell/overlay-enterprise.conf

@@ -1,10 +0,0 @@
-CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE=y
-# EAP frames are ~1100 bytes, so, need higher packet counts as default packet size is 128
-CONFIG_NET_PKT_TX_COUNT=36
-CONFIG_NET_PKT_RX_COUNT=36
-CONFIG_NET_BUF_TX_COUNT=72
-CONFIG_NET_BUF_RX_COUNT=36
-# For TLS and X.509 processing MbedTLS needs large heap size and using separate heap
-# for MbedTLS gives us more control over the heap size.
-CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=60000

snippets/wifi-enterprise/README.rst

@@ -0,0 +1,31 @@
+.. _snippet-wifi-enterprise:
+
+Wi-Fi Enterprise Snippet (wifi-enterprise)
+##########################################
+
+.. code-block:: console
+
+   west build  -S wifi-enterprise [...]
+
+Can also be used along with the :ref:`snippet-wifi-ipv4` snippet.
+
+.. code-block:: console
+
+   west build  -S "wifi-enterprise,wifi-ipv4" [...]
+
+Overview
+********
+
+This snippet enables enterprise Wi-Fi support in supported networking samples.
+
+See :ref:`wifi_mgmt` for more information on the usage.
+
+Requirements
+************
+
+Hardware support for:
+
+- :kconfig:option:`CONFIG_WIFI`
+- :kconfig:option:`CONFIG_WIFI_USE_NATIVE_NETWORKING`
+- :kconfig:option:`CONFIG_WIFI_NM_WPA_SUPPLICANT`
+- :kconfig:option:`CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE`

snippets/wifi-enterprise/snippet.yml

@@ -0,0 +1,3 @@
+name: wifi-enterprise
+append:
+  EXTRA_CONF_FILE: wifi-enterprise.conf

snippets/wifi-enterprise/wifi-enterprise.conf

@@ -1,9 +1,8 @@
+# Enable Wi-Fi enterprise mode
 CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE=y
-# EAP frames are ~1100 bytes, so, for efficiency, we set the data size to 1100
-CONFIG_NET_BUF_DATA_SIZE=1100
 # Use variable data size to reduce memory usage for small data packets
 CONFIG_NET_BUF_VARIABLE_DATA_SIZE=y
 # For TLS and X.509 processing MbedTLS needs large heap size and using separate heap
 # for MbedTLS gives us more control over the heap size.
 CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=55000
+CONFIG_MBEDTLS_HEAP_SIZE=70000