Sending messages

You use the SendChannelMessage API to send messages to a channel. For a channel associated with a channel flow, the processor assigns one of the following status values.

Message status	Description
SENT	Message processed successfully.
PENDING	Ongoing processing.
FAILED	Processing failed because the processor Lambda function is unreachable.
DENIED	The message won't be sent.

Receiving intermediate status events

Websocket events

Websocket events are sent to a channel after they successfully establish a connection. For more information, refer to Using WebSockets to receive messages.

Event type	Status	Recipients	Notes
CREATE_CHANNEL_MESSAGE	SENT	All channel members	SendChannelMessage API with successful preprocessing
UPDATE_CHANNEL_MESSAGE	SENT	All channel members	UpdateChannelMessage API with successful preprocessing
PENDING_CREATE_CHANNEL_MESSAGE	PENDING	Message sender only	SendChannelMessage API with ongoing preprocessing
PENDING_UPDATE_CHANNEL_MESSAGE	PENDING	Message sender only	UpdateChannelMessage API with ongoing preprocessing
FAILED_CREATE_CHANNEL_MESSAGE	FAILED	Message sender only	SendChannelMessage API with failed preprocessing
FAILED_UPDATE_CHANNEL_MESSAGE	FAILED	Message sender only	UpdateChannelMessage API with failed preprocessing
DENIED_CREATE_CHANNEL_MESSAGE	DENIED	Message sender only	SendChannelMessage API with processor denying the message
DENIED_UPDATE_CHANNEL_MESSAGE	DENIED	Message sender only	UpdateChannelMessage API with processor denying the message

GetChannelMessageStatus API

This API provides an alternative way to retrieve message status if the event was not received due to a bad websocket connection. For more information, refer to the GetChannelMessageStatus API documentation.

Note

This API does not return statuses for denied messages, because we don't store them.