samples: net: sockets: echo: enable socket offload for cc3220sf_launchxl

Add a prj conf file for the TI cc3220sf_launchxl board
to enable socket offload to the simplelink WiFi driver.

Signed-off-by: Gil Pitney <gil.pitney@linaro.org>

samples/net/sockets/echo/CMakeLists.txt

@@ -1,8 +1,19 @@
 cmake_minimum_required(VERSION 3.8.2)
+macro(set_conf_file)
+  if(EXISTS ${APPLICATION_SOURCE_DIR}/prj_${BOARD}.conf)
+    set(CONF_FILE "${APPLICATION_SOURCE_DIR}/prj_${BOARD}.conf")
+  elseif(EXISTS ${APPLICATION_SOURCE_DIR}/boards/${BOARD}.conf)
+    set(CONF_FILE
+      "prj.conf ${APPLICATION_SOURCE_DIR}/boards/${BOARD}.conf")
+  else()
+    set(CONF_FILE "prj.conf")
+  endif()
+endmacro()
+
 include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
 project(NONE)
 
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources})
 
-include($ENV{ZEPHYR_BASE}/samples/net/common/common.cmake)
+include($ENV{ZEPHYR_BASE}/samples/net/common/common.cmake)

samples/net/sockets/echo/README.rst

@@ -76,3 +76,15 @@ To test:
 
 As can be seen, the behavior of the application is the same as the Zephyr
 version.
+
+Running on cc3220sf_launchxl
+============================
+
+See the note on Provisioning and Fast Connect in :ref:`cc3220sf_launchxl`.
+
+After having connected to an Access Point using the sample WiFi shell,
+the IP address will be printed to the console upon running this echo
+application.
+
+Proceed to test as above.
+

samples/net/sockets/echo/boards/cc3220sf_launchxl.conf

@@ -0,0 +1,23 @@
+# Networking Config:
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=n
+CONFIG_NET_SOCKETS=y
+
+# Enable SimpleLink WiFi Driver and Socket Offload
+CONFIG_WIFI=y
+CONFIG_WIFI_SIMPLELINK=y
+CONFIG_NET_SOCKETS_OFFLOAD=y
+
+# Disable unneeded settings from the base prj.conf:
+CONFIG_TEST_RANDOM_GENERATOR=n
+CONFIG_NET_CONFIG_SETTINGS=n
+CONFIG_NET_CONFIG_MY_IPV4_ADDR=""
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR=""
+
+# Debugging
+CONFIG_NET_LOG=y
+CONFIG_SYS_LOG_WIFI_LEVEL=4
+CONFIG_DEBUG=y
+#CONFIG_SYS_LOG=y
+#CONFIG_ASSERT=y