Submit a message
A transaction that submits a topic message to the Hedera network. To access the messages submitted to a topic ID, subscribe to the topic via a mirror node. The mirror node will publish the ordered messages to subscribers. Once the transaction is successfully executed, the receipt of the transaction will include the topic's updated sequence number and topic running hash.
Transaction Signing Requirements
- Anyone can submit a message to a public topic
- The submitKey is required to sign the transaction for a private topic
Transaction Fees
HCS message size: 1024 bytes
V1
Constructor | Description |
|---|---|
new ConsensusMessageSubmitTransaction() | Initializes a ConsensusMessageSubmitTransaction object |
new ConsensusMessageSubmitTransaction()
Methods
Method | Type | Description | Requirement |
|---|---|---|---|
setTopicId(<topicId>) | TopicId | The topic ID to submit the message to | Required |
setMessage(<message>) | String | The message in a String format | Optional |
setMessage(<message>) | byte [ ] | The message in a byte array format | Optional |
setMessage(<message>) | ByteString | The message in a ByteString format | Optional |
setMaxChunk(<maxChunks>) | int | The number of chunks to break the message into. Default:10 | Optional |
setMaxChunkInfo(<initial
Transactionid
,totalNumber, number>) | TransactionId, int, int | initialId: TransactionID of the first chunk, gets copied to every subsequent chunk in a fragmented message. total: total number of chunks number: The sequence number (from 1 to total) of the current chunk in the message. | Optional |
Java
//Submits a message to a public topic
new ConsensusMessageSubmitTransaction()
.setTopicId(topicId)
.setMessage("hello, HCS! " + i)
.build(client)
.execute(client)
.getReceipt(client);
//v1.3.2
JavaScript
//Submits a message to a public topic
await new ConsensusMessageSubmitTransaction()
.setTopicId(topicId)
.setMessage("hello, HCS! " + i)
.build(client)
.execute(client)
.getReceipt(client);
//v1.4.4
V2
Method | Type | Description |
|---|---|---|
getTopicId() | TopicId | The topic ID to submit the message to |
getMessage() | ByteString | The message being submitted |
getAllTransactionHash() | byte [ ] | The hash for each transaction |
Java
//Create the transaction
TopicMessageSubmitTransaction transaction = new TopicMessageSubmitTransaction()
.setTopicId(newTopicId)
.setMessage("hello, HCS! ");
//Get the transaction message
ByteString getMessage = transaction.getMessage();
//v2.0.0
JavaScript
//Create the transaction
const transaction = await new TopicMessageSubmitTransaction()
.setTopicId(newTopicId)
.setMessage("hello, HCS! ");
//Get the transaction message
const getMessage = transaction.getMessage();
//v2.0.0
Go
//Create the transaction
transaction := hedera.NewTopicSubmitTransaction().
SetTopicID(topicID).
SetMessage([]byte(content))
//Get the transaction message
getMessage := transaction.GetMessage()
//v2.0.0
Last modified 4mo ago