Get topic messages
Subscribe to a topic ID's messages from a mirror node. You will receive all messages for the specified topic or within the defined start and end time.
Query Fees
Method | Type | Description | Requirement |
|---|---|---|---|
setTopicId(<topicId>) | TopicId | The topic ID to subscribe to | Required |
setStartTime(<startTime>) | Instant | The time to start subscribing to a topic's messages | Optional |
setEndTime(<endTime>) | Instant | The time to stop subscribing to a topic's messages | Optional |
setLimit(<limit>) | long | The number of messages to return | Optional |
subscribe(<client, onNext) | SubscriptionHandle | Client, Consumer<TopicMessage> | Required |
Java
JavaScript
Go
//Create the query
new TopicMessageQuery()
.setTopicId(newTopicId)
.subscribe(client, topicMessage -> {
System.out.println("at " + topicMessage.consensusTimestamp + " ( seq = " + topicMessage.sequenceNumber + " ) received topic message of " + topicMessage.contents.length + " bytes");
});
//v2.0.0
//Create the query
new TopicMessageQuery()
.setTopicId(topicId)
.setStartTime(0)
.subscribe(
client,
(message) => console.log(Buffer.from(message.contents, "utf8").toString())
);
//v2.0.0
//Create the query
_, err = hedera.NewTopicMessageQuery().
SetTopicID(topicID).
Subscribe(client, func(message hedera.TopicMessage) {
if string(message.Contents) == content {
wait = false
}
})
if err != nil {
panic(err)
}
//v2.0.0
Last modified 6mo ago