diff --git a/libraries/WiFi/src/WiFiClient.cpp b/libraries/WiFi/src/WiFiClient.cpp
index 52df273149a..f097ff3c984 100644
--- a/libraries/WiFi/src/WiFiClient.cpp
+++ b/libraries/WiFi/src/WiFiClient.cpp
@@ -216,9 +216,9 @@ int WiFiClient::connect(IPAddress ip, uint16_t port, int32_t timeout)
 
     uint32_t ip_addr = ip;
     struct sockaddr_in serveraddr;
-    bzero((char *) &serveraddr, sizeof(serveraddr));
+    memset((char *) &serveraddr, 0, sizeof(serveraddr));
     serveraddr.sin_family = AF_INET;
-    bcopy((const void *)(&ip_addr), (void *)&serveraddr.sin_addr.s_addr, 4);
+    memcpy((void *)&serveraddr.sin_addr.s_addr, (const void *)(&ip_addr), 4);
     serveraddr.sin_port = htons(port);
     fd_set fdset;
     struct timeval tv;
diff --git a/libraries/WiFiClientSecure/src/ssl_client.cpp b/libraries/WiFiClientSecure/src/ssl_client.cpp
index 9f168a0aabd..52311378912 100644
--- a/libraries/WiFiClientSecure/src/ssl_client.cpp
+++ b/libraries/WiFiClientSecure/src/ssl_client.cpp
@@ -227,7 +227,7 @@ int start_ssl_client(sslclient_context *ssl_client, const char *host, uint32_t p
     log_v("Verifying peer X.509 certificate...");
 
     if ((flags = mbedtls_ssl_get_verify_result(&ssl_client->ssl_ctx)) != 0) {
-        bzero(buf, sizeof(buf));
+        memset(buf, 0, sizeof(buf));
         mbedtls_x509_crt_verify_info(buf, sizeof(buf), "  ! ", flags);
         log_e("Failed to verify peer certificate! verification info: %s", buf);
         stop_ssl_socket(ssl_client, rootCABuff, cli_cert, cli_key);  //It's not safe continue.
diff --git a/tools/sdk/bin/bootloader_dio_40m.bin b/tools/sdk/bin/bootloader_dio_40m.bin
index f2d94dc3c8f..350107a9e0c 100644
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diff --git a/tools/sdk/bin/bootloader_qout_40m.bin b/tools/sdk/bin/bootloader_qout_40m.bin
index f2d94dc3c8f..8299f444980 100644
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diff --git a/tools/sdk/bin/bootloader_qout_80m.bin b/tools/sdk/bin/bootloader_qout_80m.bin
index 592e62b417e..b6c1b11a393 100644
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diff --git a/tools/sdk/include/config/sdkconfig.h b/tools/sdk/include/config/sdkconfig.h
index b49c866cab8..f8bb8d5cb3c 100644
--- a/tools/sdk/include/config/sdkconfig.h
+++ b/tools/sdk/include/config/sdkconfig.h
@@ -393,5 +393,5 @@
 #define CONFIG_BTDM_MODEM_SLEEP_MODE_ORIG 1
 #define CONFIG_ARDUHAL_LOG_DEFAULT_LEVEL_ERROR 1
 #define CONFIG_FATFS_API_ENCODING_ANSI_OEM 1
-#define CONFIG_ARDUINO_IDF_COMMIT "68b237fe5"
+#define CONFIG_ARDUINO_IDF_COMMIT "c33fc7821"
 #define CONFIG_ARDUINO_IDF_BRANCH "release/v3.3"
diff --git a/tools/sdk/include/mqtt/mqtt_client.h b/tools/sdk/include/mqtt/mqtt_client.h
index e365cb8463c..67c082825c3 100644
--- a/tools/sdk/include/mqtt/mqtt_client.h
+++ b/tools/sdk/include/mqtt/mqtt_client.h
@@ -80,10 +80,17 @@ typedef enum {
  */
 typedef enum {
     MQTT_ERROR_TYPE_NONE = 0,
-    MQTT_ERROR_TYPE_ESP_TLS,
+    MQTT_ERROR_TYPE_TCP_TRANSPORT,
     MQTT_ERROR_TYPE_CONNECTION_REFUSED,
 } esp_mqtt_error_type_t;
 
+/**
+ * MQTT_ERROR_TYPE_TCP_TRANSPORT error type hold all sorts of transport layer errors,
+ * including ESP-TLS error, but in the past only the errors from MQTT_ERROR_TYPE_ESP_TLS layer
+ * were reported, so the ESP-TLS error type is re-defined here for backward compatibility
+ */
+#define MQTT_ERROR_TYPE_ESP_TLS MQTT_ERROR_TYPE_TCP_TRANSPORT
+
 typedef enum {
     MQTT_TRANSPORT_UNKNOWN = 0x0,
     MQTT_TRANSPORT_OVER_TCP,      /*!< MQTT over TCP, using scheme: ``mqtt`` */
@@ -110,7 +117,7 @@ typedef enum {
  * Use this structure directly checking error_type first and then appropriate error code depending on the source of the error:
  *
  * | error_type | related member variables | note |
- * | MQTT_ERROR_TYPE_ESP_TLS | esp_tls_last_esp_err, esp_tls_stack_err, esp_tls_cert_verify_flags | Error reported from esp-tls |
+ * | MQTT_ERROR_TYPE_TCP_TRANSPORT | esp_tls_last_esp_err, esp_tls_stack_err, esp_tls_cert_verify_flags, sock_errno | Error reported from tcp_transport/esp-tls |
  * | MQTT_ERROR_TYPE_CONNECTION_REFUSED | connect_return_code | Internal error reported from MQTT broker on connection |
  */
 typedef struct esp_mqtt_error_codes {
@@ -121,6 +128,9 @@ typedef struct esp_mqtt_error_codes {
     /* esp-mqtt specific structure extension */
     esp_mqtt_error_type_t error_type;            /*!< error type referring to the source of the error */
     esp_mqtt_connect_return_code_t connect_return_code; /*!< connection refused error code reported from MQTT broker on connection */
+    /* tcp_transport extension */
+    int       esp_transport_sock_errno;         /*!< errno from the underlying socket */
+
 } esp_mqtt_error_codes_t;
 
 /**
@@ -179,7 +189,7 @@ typedef struct {
     int refresh_connection_after_ms;        /*!< Refresh connection after this value (in milliseconds) */
     const struct psk_key_hint* psk_hint_key;     /*!< Pointer to PSK struct defined in esp_tls.h to enable PSK authentication (as alternative to certificate verification). If not NULL and server/client certificates are NULL, PSK is enabled */
     bool          use_global_ca_store;      /*!< Use a global ca_store for all the connections in which this bool is set. */
-    int reconnect_timeout_ms;               /*!< Reconnect to the broker after this value in miliseconds if auto reconnect is not disabled */
+    int reconnect_timeout_ms;               /*!< Reconnect to the broker after this value in miliseconds if auto reconnect is not disabled (defaults to 10s) */
     const char **alpn_protos;               /*!< NULL-terminated list of supported application protocols to be used for ALPN */
     const char *clientkey_password;         /*!< Client key decryption password string */
     int clientkey_password_len;             /*!< String length of the password pointed to by clientkey_password */
@@ -188,6 +198,8 @@ typedef struct {
     bool skip_cert_common_name_check;       /*!< Skip any validation of server certificate CN field, this reduces the security of TLS and makes the mqtt client susceptible to MITM attacks  */
     bool use_secure_element;                /*!< enable secure element for enabling SSL connection */
     void *ds_data;                          /*!< carrier of handle for digital signature parameters */
+    int network_timeout_ms;                 /*!< Abort network operation if it is not completed after this value, in milliseconds (defaults to 10s) */
+    bool disable_keepalive;                 /*!< Set disable_keepalive=true to turn off keep-alive mechanism, false by default (keepalive is active by default). Note: setting the config value `keepalive` to `0` doesn't disable keepalive feature, but uses a default keepalive period */
 } esp_mqtt_client_config_t;
 
 /**
@@ -347,6 +359,14 @@ esp_err_t esp_mqtt_set_config(esp_mqtt_client_handle_t client, const esp_mqtt_cl
  */
 esp_err_t esp_mqtt_client_register_event(esp_mqtt_client_handle_t client, esp_mqtt_event_id_t event, esp_event_handler_t event_handler, void* event_handler_arg);
 
+/**
+ * @brief Get outbox size
+ *
+ * @param client            mqtt client handle
+ * @return outbox size
+ */
+int esp_mqtt_client_get_outbox_size(esp_mqtt_client_handle_t client);
+
 #ifdef __cplusplus
 }
 #endif //__cplusplus
diff --git a/tools/sdk/include/mqtt/mqtt_config.h b/tools/sdk/include/mqtt/mqtt_config.h
index e259a2a1188..d9b64c7594b 100644
--- a/tools/sdk/include/mqtt/mqtt_config.h
+++ b/tools/sdk/include/mqtt/mqtt_config.h
@@ -84,8 +84,8 @@
 #endif
 #endif
 
-#ifdef  CONFIG_OUTBOX_EXPIRED_TIMEOUT_MS
-#define OUTBOX_EXPIRED_TIMEOUT_MS   CONFIG_OUTBOX_EXPIRED_TIMEOUT_MS
+#ifdef  CONFIG_MQTT_OUTBOX_EXPIRED_TIMEOUT_MS
+#define OUTBOX_EXPIRED_TIMEOUT_MS   CONFIG_MQTT_OUTBOX_EXPIRED_TIMEOUT_MS
 #else
 #define OUTBOX_EXPIRED_TIMEOUT_MS   (30*1000)
 #endif
diff --git a/tools/sdk/include/mqtt/mqtt_supported_features.h b/tools/sdk/include/mqtt/mqtt_supported_features.h
index 9f1acf2ffad..eb7ad631ca0 100644
--- a/tools/sdk/include/mqtt/mqtt_supported_features.h
+++ b/tools/sdk/include/mqtt/mqtt_supported_features.h
@@ -56,6 +56,7 @@
 #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 3, 0)
 // Features supported in 4.3
 #define MQTT_SUPPORTED_FEATURE_DIGITAL_SIGNATURE
+#define MQTT_SUPPORTED_FEATURE_TRANSPORT_SOCK_ERRNO_REPORTING
 #endif
 
 #endif /* ESP_IDF_VERSION */
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