Merge branch 'feature/message_topic_in_multichunk_msg' into 'master'

feat: Include message topic in all chunks

Closes IDFGH-11179

See merge request espressif/esp-mqtt!219

Author: euripedesrocha

mqtt_client.c

@@ -521,7 +521,7 @@ esp_err_t esp_mqtt_set_config(esp_mqtt_client_handle_t client, const esp_mqtt_cl
     } else {
         client->config->reconnect_timeout_ms = MQTT_RECON_DEFAULT_MS;
     }
-    
+
     client->config->transport = config->network.transport;
 
     if (config->network.if_name) {
@@ -1062,7 +1062,7 @@ static esp_err_t deliver_publish(esp_mqtt_client_handle_t client)
         }
 #endif
     } else {
-        // get topic
+        // get and save topic
         msg_topic = mqtt_get_publish_topic(msg_buf, &msg_topic_len);
         if (msg_topic == NULL) {
             ESP_LOGE(TAG, "%s: mqtt_get_publish_topic() failed", __func__);
@@ -1077,6 +1077,10 @@ static esp_err_t deliver_publish(esp_mqtt_client_handle_t client)
             return ESP_FAIL;
         }
     }
+    char *saved_msg_topic = strndup(msg_topic, msg_topic_len);
+    ESP_MEM_CHECK(TAG, saved_msg_topic, return ESP_ERR_NO_MEM);
+    size_t saved_msg_topic_len = msg_topic_len;
+
     // post data event
     client->event.retain = mqtt_get_retain(msg_buf);
     if (client->mqtt_state.connection.information.protocol_ver == MQTT_PROTOCOL_V_5) {
@@ -1089,7 +1093,7 @@ static esp_err_t deliver_publish(esp_mqtt_client_handle_t client)
     client->event.qos = mqtt_get_qos(msg_buf);
     client->event.dup = mqtt_get_dup(msg_buf);
     client->event.total_data_len = msg_data_len + msg_total_len - msg_read_len;
-post_data_event:
+
     ESP_LOGD(TAG, "Get data len= %"NEWLIB_NANO_COMPAT_FORMAT", topic len=%"NEWLIB_NANO_COMPAT_FORMAT", total_data: %d offset: %"NEWLIB_NANO_COMPAT_FORMAT,
              NEWLIB_NANO_COMPAT_CAST(msg_data_len), NEWLIB_NANO_COMPAT_CAST(msg_topic_len),
              client->event.total_data_len, NEWLIB_NANO_COMPAT_CAST(msg_data_offset));
@@ -1101,24 +1105,39 @@ static esp_err_t deliver_publish(esp_mqtt_client_handle_t client)
     client->event.topic_len = msg_topic_len;
     esp_mqtt_dispatch_event(client);
 
-    if (msg_read_len < msg_total_len) {
+    client->event.topic = saved_msg_topic;
+    client->event.topic_len = saved_msg_topic_len;
+    while(msg_read_len < msg_total_len) {
         size_t buf_len = client->mqtt_state.in_buffer_length;
-
         msg_data = (char *)client->mqtt_state.in_buffer;
-        msg_topic = NULL;
-        msg_topic_len = 0;
         msg_data_offset += msg_data_len;
-        int ret = esp_transport_read(client->transport, (char *)client->mqtt_state.in_buffer,
-                                     msg_total_len - msg_read_len > buf_len ? buf_len : msg_total_len - msg_read_len,
-                                     client->config->network_timeout_ms);
+
+        size_t read_len;
+        if(msg_total_len - msg_read_len > buf_len - saved_msg_topic_len) {
+            read_len = buf_len - saved_msg_topic_len;
+        } else {
+            read_len = msg_total_len - msg_read_len;
+        }
+
+        int ret = esp_transport_read(client->transport, (char *)client->mqtt_state.in_buffer, read_len, client->config->network_timeout_ms);
         if (ret <= 0) {
             return esp_mqtt_handle_transport_read_error(ret, client, false) == 0 ? ESP_OK : ESP_FAIL;
         }
 
         msg_data_len = ret;
         msg_read_len += msg_data_len;
-        goto post_data_event;
+
+        ESP_LOGD(TAG, "Get data len= %"NEWLIB_NANO_COMPAT_FORMAT", topic len=%"NEWLIB_NANO_COMPAT_FORMAT", total_data: %d offset: %"NEWLIB_NANO_COMPAT_FORMAT,
+                 NEWLIB_NANO_COMPAT_CAST(msg_data_len), NEWLIB_NANO_COMPAT_CAST(msg_topic_len),
+                 client->event.total_data_len, NEWLIB_NANO_COMPAT_CAST(msg_data_offset));
+
+        client->event.data_len = msg_data_len;
+        client->event.current_data_offset = msg_data_offset;
+
+        esp_mqtt_dispatch_event(client);
+
     }
+    free(saved_msg_topic);
     return ESP_OK;
 }