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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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Integrations
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Migrating to Ably from an existing service
Is there a limit to the length of the ClientId or Channel name?
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.
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.