[SL-UP] Optimize region_code setting for wifi apps. (#533)

Co-authored-by: senthilku <[email protected]>

Author: arun-silabs

src/platform/silabs/wifi/SiWx/WifiInterface.cpp

@@ -110,13 +110,13 @@ sl_net_wifi_lwip_context_t wifi_client_context;
 #endif // SLI_SI91X_LWIP_HOSTED_NETWORK_STACK
 sl_wifi_security_t security = SL_WIFI_SECURITY_UNKNOWN;
 
-// TODO : Temporary work-around for wifi-init failure in 917NCP ACX module board(BRD4357A). Can be removed after
-// Wiseconnect fixes region code for all ACX module boards.
-#ifdef ACX_MODULE_BOARD
-#define REGION_CODE IGNORE_REGION
-#else
+// The REGION_CODE macro defines the regulatory region for the Wi-Fi device.
+// The default value is 'US'. Users can override this macro to specify a different region code.
+// The region code must match one of the values defined in the 'sl_wifi_region_code_t' enum,
+// which is located in 'wifi-sdk/inc/sl_wifi_constants.h'. Example values include US, EU, JP, etc.
+#ifndef REGION_CODE
 #define REGION_CODE US
-#endif // ACX_MODULE_BOARD
+#endif // !def REGION_CODE
 
 const sl_wifi_device_configuration_t config = {
     .boot_option = LOAD_NWP_FW,

third_party/silabs/efr32_sdk.gni

@@ -617,7 +617,7 @@ template("efr32_sdk") {
       if (use_SiWx917_module) {
         defines += [
           "USE_BYPASS_CLOCK=1",
-          "ACX_MODULE_BOARD=1",
+          "SL_SI91X_ACX_MODULE=1",
         ]
       }