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feat(mqtt5): Exposes server properties in connect event

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ESP_MQTT_EVENT_CONNECTED exposes the server properties

Closes: #325
This commit is contained in:
Euripedes Rocha Filho
2026-04-24 13:55:21 +02:00
committed by Euripedes Rocha
parent 996177a46d
commit e121e1b34b
5 changed files with 99 additions and 4 deletions
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include/mqtt5_client.h
+21 -1
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -142,6 +142,25 @@ typedef struct {
user_property; /*!< The handle for user property, call function esp_mqtt5_client_set_user_property to set it */
} esp_mqtt5_disconnect_property_config_t;
/**
* MQTT5 server response properties from CONNACK (section 3.2.2.3)
*
* These properties indicate the server's capabilities and limits.
* Available in MQTT_EVENT_CONNECTED via event->property->server.
*/
typedef struct {
uint32_t maximum_packet_size; /*!< Maximum packet size the server will accept (0 = no limit imposed) */
uint16_t receive_maximum; /*!< Maximum number of QoS 1/2 messages the server will process concurrently */
uint16_t topic_alias_maximum; /*!< Maximum topic alias value the client may use (0 = topic aliases not supported) */
uint8_t max_qos; /*!< Maximum QoS level the server supports (0, 1, or 2) */
bool retain_available; /*!< true if the server supports retained messages */
bool wildcard_subscribe_available; /*!< true if the server supports wildcard subscriptions */
bool subscribe_identifiers_available; /*!< true if the server supports subscription identifiers */
bool shared_subscribe_available; /*!< true if the server supports shared subscriptions */
const char *response_info; /*!< Response information string for request/response (NULL if not provided) */
int response_info_len; /*!< Length of response_info */
} esp_mqtt5_server_resp_property_t;
/**
* MQTT5 protocol for event properties
*/
@@ -156,6 +175,7 @@ typedef struct {
uint16_t subscribe_id; /*!< Subscription identifier of the message */
mqtt5_user_property_handle_t
user_property; /*!< The handle for user property, call function esp_mqtt5_client_delete_user_property to free the memory */
esp_mqtt5_server_resp_property_t server; /*!< Server response properties from CONNACK (valid only in MQTT_EVENT_CONNECTED) */
} esp_mqtt5_event_property_t;
/**