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
🚨 NOTE: Max size of an HCS message: 1024 bytes (1 kb).
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 |
Java
JavaScript
Go
//Create the transaction
TopicMessageSubmitTransaction transaction = new TopicMessageSubmitTransaction()
.setTopicId(newTopicId)
.setMessage("hello, HCS! ");
//Sign with the client operator key and submit transaction to a Hedera network, get transaction ID
TransactionResponse txResponse = transaction.execute(client);
//Request the receipt of the transaction
TransactionReceipt receipt = txResponse.getReceipt(client);
//Get the transaction consensus status
Status transactionStatus = receipt.status;
System.out.println("The transaction consensus status is " +transactionStatus);
//v2.0.0
//Create the transaction
await new TopicMessageSubmitTransaction({
topicId: createReceipt.topicId,
message: "Hello World",
}).execute(client);
//v2.0.0
//Create the transaction
transaction := hedera.NewTopicSubmitTransaction().
SetTopicID(topicID).
SetMessage([]byte(content))
//Sign with the client operator private key and submit the transaction to a Hedera network
txResponse, err := transaction.Execute(client)
if err != nil {
panic(err)
}
//Request the receipt of the transaction
transactionReceipt, err := txResponse.GetReceipt(client)
if err != nil {
panic(err)
}
//Get the transaction consensus status
transactionStatus := receipt.Status
fmt.Printf("The transaction consensus status is %v\n", transactionStatus)
//v2.0.0
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
JavaScript
Go
//Create the transaction
TopicMessageSubmitTransaction transaction = new TopicMessageSubmitTransaction()
.setTopicId(newTopicId)
.setMessage("hello, HCS! ");
//Get the transaction message
ByteString getMessage = transaction.getMessage();
//v2.0.0
//Create the transaction
const transaction = await new TopicMessageSubmitTransaction()
.setTopicId(newTopicId)
.setMessage("hello, HCS! ");
//Get the transaction message
const getMessage = transaction.getMessage();
//v2.0.0
//Create the transaction
transaction := hedera.NewTopicSubmitTransaction().
SetTopicID(topicID).
SetMessage([]byte(content))
//Get the transaction message
getMessage := transaction.GetMessage()
//v2.0.0
Last modified 1mo ago