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Account billing and packages
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General
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Realtime API and client libraries
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Troubleshooting
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Channels
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REST API and client libraries
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Ably error codes
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Account and app setup and configuration
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Ably architecture, transports, and security
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Performance and Redundancy
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Push Notifications
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Reactor Queues, Events and Firehose
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Migrating to Ably from an existing service
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API Streamer
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Connections
Is there a limit to the length of the ClientId or Channel name?
For clientId: there is no limit; however the clientId is counted as part of the size of the message and will contribute towards the total message size.
For channel name: see What restrictions are there on channel names
See What is the maximum message size for more details on message size limits by account type.