fix(iot-client): rename US region to AZ

CHANGELOG.md

@@ -5,6 +5,16 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+- iot-client — US region renamed to AZ(#7).
+  - The IoT DNS region string and token prefix for the US West (Oregon) data
+    center is `AZ`, not `US`. The enum member `US` is renamed to `AZ`,
+    `iot_region_to_string()` now returns `"AZ"`, and the host macros
+    `IOT_US_HOST` / `IOT_US_PRE_HOST` are renamed to `IOT_AZ_HOST` /
+    `IOT_AZ_PRE_HOST` (values unchanged). NVS-stored region integers are
+    unaffected (enum ordinal 1 is preserved).
+
 ## [0.3.0] - 2026-07-13
 
 ### Added

docs-site/docs/reference/iot-client.md

@@ -45,7 +45,7 @@ sidebar_position: 3
 | 值 | 名称 | 说明 |
 |----|------|------|
 | 0 | `AY` | 中国（上海）|
-| 1 | `US` | 美国西部（俄勒冈） |
+| 1 | `AZ` | 美国西部（俄勒冈） |
 | 2 | `UEAZ` | 美国东部（佛吉尼亚） |
 | 3 | `EU` | 欧洲（法兰克福） |
 | 4 | `WEAZ` | 欧洲西部（荷兰埃姆斯哈文） |

examples/esp-idf/ota-demo/main/app_config.h

@@ -10,7 +10,7 @@
 #define DEFAULT_SECRET_KEY   "xxxxxxxxxxxxxxxx"
 #define DEFAULT_LOCAL_KEY    "xxxxxxxxxxxxxxxx"
 
-/* Device region: AY, US, EU, UEAZ, WEAZ, IN, SG */
+/* Device region: AY, AZ, EU, UEAZ, WEAZ, IN, SG */
 #define DEFAULT_REGION       AY
 #define DEFAULT_ENV          PROD
 

examples/posix/pair/scan-by-app/scan_by_app_pair_demo_main.c

@@ -27,7 +27,7 @@ static void print_usage(const char *prog)
     printf("  %s <token>          Token pairing   (activate directly)\n", prog);
     printf("\n");
     printf("Token format: [region:2][activation_token][secret:4]\n");
-    printf("  region  : AY, US, UE, EU, WE, IN, SG\n");
+    printf("  region  : AY, AZ, UE, EU, WE, IN, SG\n");
     printf("  Example : AYabcdef12340000\n");
 }
 

modules/iot-client/include/iot_client.h

@@ -34,7 +34,7 @@
 
 typedef enum {
     AY = 0,
-    US,
+    AZ,
     UEAZ,
     EU,
     WEAZ,
@@ -148,7 +148,7 @@ struct iot_dp_context;
     char mqtt_url[64];            // MQTT broker URL (inline, mqtt://|mqtts://; "" = unresolved)
     char *schema;                 // Device schema JSON (dynamically allocated)
 
-    iot_region_t region;           // Server region (CN, US, EU, IN)
+    iot_region_t region;           // Server region (CN, AZ, EU, IN)
     iot_env_t env;                 // Environment (PROD or PRE)
     bool mqtt_disable_tls;         // false = mqtts (TLS), true = mqtt (TCP)
     const pal_t *pal;             // PAL adapter

modules/iot-client/src/iot_client.c

@@ -36,7 +36,7 @@ static const char *iot_region_to_string(iot_region_t region)
 {
     switch (region) {
         case AY:   return "AY";
-        case US:   return "US";
+        case AZ:   return "AZ";
         case UEAZ: return "UEAZ";
         case EU:   return "EU";
         case WEAZ: return "WEAZ";

modules/iot-client/src/iot_config_defaults.h

@@ -23,8 +23,8 @@
 #define IOT_DEFAULT_PRE_HOST "a1-cn.wgine.com"
 #define IOT_CN_HOST "a1.tuyacn.com"
 #define IOT_CN_PRE_HOST "a1-cn.wgine.com"
-#define IOT_US_HOST "a1.tuyaus.com"
-#define IOT_US_PRE_HOST "a1-us.wgine.com"
+#define IOT_AZ_HOST "a1.tuyaus.com"
+#define IOT_AZ_PRE_HOST "a1-us.wgine.com"
 #define IOT_UEAZ_HOST "a1-ueaz.tuyaeu.com"
 #define IOT_UEAZ_PRE_HOST "a1-ueaz.wgine.com"
 #define IOT_EU_HOST "a1.tuyaeu.com"

modules/iot-client/src/iot_dns.c

@@ -352,8 +352,8 @@ char *iot_region_to_host(iot_region_t region, iot_env_t env)
                 switch (region) {
                     case AY:
                         return IOT_CN_PRE_HOST;
-                    case US:
-                        return IOT_US_PRE_HOST;
+                    case AZ:
+                        return IOT_AZ_PRE_HOST;
                     case UEAZ:
                         return IOT_UEAZ_PRE_HOST;
                     case EU:
@@ -369,8 +369,8 @@ char *iot_region_to_host(iot_region_t region, iot_env_t env)
             switch (region) {
                 case AY:
                     return IOT_CN_HOST;
-                case US:
-                    return IOT_US_HOST;
+                case AZ:
+                    return IOT_AZ_HOST;
                 case UEAZ:
                     return IOT_UEAZ_HOST;
                 case EU:

modules/iot-client/src/iot_on_boarding.c

@@ -65,8 +65,8 @@ static void parse_activation_message(const pal_t *pal, const char *json_str, act
         const char *r = region->valuestring;
         if (strcmp(r, "AY") == 0) {
             message->region = AY;
-        } else if (strcmp(r, "US") == 0) {
-            message->region = US;
+        } else if (strcmp(r, "AZ") == 0) {
+            message->region = AZ;
         } else if (strcmp(r, "EU") == 0) {
             message->region = EU;
         } else if (strcmp(r, "IN") == 0) {
@@ -380,8 +380,8 @@ static int __token_to_region(const char *token, iot_region_t *region)
 
     if (strcmp(prefix, "AY") == 0) {
         *region = AY;
-    } else if (strcmp(prefix, "US") == 0) {
-        *region = US;
+    } else if (strcmp(prefix, "AZ") == 0) {
+        *region = AZ;
     } else if (strcmp(prefix, "UE") == 0) {
         *region = UEAZ;
     } else if (strcmp(prefix, "EU") == 0) {