[Silabs] Adds debug prints for rs911x platform for better understanding (project-chip#37102)

* Improve error logging for WiFi data transmission failures in low_level_output

* Adds SLAAC IPv6 print

* Revert line for define check

* Adds missing includes

* Update status initialization

* Revert "Update status initialization"

This reverts commit f8f8377.

* Adds change based on comments

* Fix compilation

---------

Co-authored-by: Rohan S <3526930+brosahay@users.noreply.github.com>

Author: rosahay-silabs

src/platform/silabs/wifi/lwip-support/ethernetif.cpp

@@ -334,8 +334,7 @@ static err_t low_level_output(struct netif * netif, struct pbuf * p)
 {
 #if (SLI_SI91X_MCU_INTERFACE | EXP_BOARD)
     UNUSED_PARAMETER(netif);
-    sl_status_t status;
-    status = sl_wifi_send_raw_data_frame(SL_WIFI_CLIENT_INTERFACE, (uint8_t *) p->payload, p->len);
+    sl_status_t status = sl_wifi_send_raw_data_frame(SL_WIFI_CLIENT_INTERFACE, (uint8_t *) p->payload, p->len);
     if (status != SL_STATUS_OK)
     {
         return ERR_IF;
@@ -367,14 +366,14 @@ static err_t low_level_output(struct netif * netif, struct pbuf * p)
 #endif
     if ((netif->flags & (NETIF_FLAG_LINK_UP | NETIF_FLAG_UP)) != (NETIF_FLAG_LINK_UP | NETIF_FLAG_UP))
     {
-        ChipLogProgress(DeviceLayer, "EN-RSI:NOT UP");
+        ChipLogError(DeviceLayer, "EN-RSI:NOT UP");
         xSemaphoreGive(ethout_sem);
         return ERR_IF;
     }
     packet = wfx_rsi_alloc_pkt();
     if (!packet)
     {
-        ChipLogProgress(DeviceLayer, "EN-RSI:No buf");
+        ChipLogError(DeviceLayer, "EN-RSI:No buf");
         xSemaphoreGive(ethout_sem);
         return ERR_IF;
     }
@@ -402,9 +401,10 @@ static err_t low_level_output(struct netif * netif, struct pbuf * p)
     /* forward the generated packet to RSI to
      * send the data over wifi network
      */
-    if (wfx_rsi_send_data(packet, datalength))
+    int32_t status = wfx_rsi_send_data(packet, datalength);
+    if (status != 0)
     {
-        ChipLogProgress(DeviceLayer, "*ERR*EN-RSI:Send fail");
+        ChipLogError(DeviceLayer, "*ERR*EN-RSI:Send fail: %ld", status);
         xSemaphoreGive(ethout_sem);
         return ERR_IF;
     }

src/platform/silabs/wifi/rs911x/WifiInterfaceImpl.cpp

@@ -19,6 +19,7 @@
 #include "silabs_utils.h"
 #include "sl_status.h"
 #include <cmsis_os2.h>
+#include <inet/IPAddress.h>
 #include <lib/support/CHIPMem.h>
 #include <lib/support/CHIPMemString.h>
 #include <lib/support/CodeUtils.h>
@@ -502,6 +503,9 @@ void HandleDHCPPolling(void)
      */
     if ((ip6_addr_ispreferred(netif_ip6_addr_state(sta_netif, 0))) && !HasNotifiedIPv6Change())
     {
+        char addrStr[chip::Inet::IPAddress::kMaxStringLength] = { 0 };
+        VerifyOrReturn(ip6addr_ntoa_r(netif_ip6_addr(sta_netif, 0), addrStr, sizeof(addrStr)) != nullptr);
+        ChipLogProgress(DeviceLayer, "SLAAC OK: linklocal addr: %s", addrStr);
         NotifyIPv6Change(true);
         WifiPlatformEvent event = WifiPlatformEvent::kStationDhcpDone;
         PostWifiPlatformEvent(event);