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Overview of API field limits
| API Field | < 0.8.0 | 0.8.0 - 2.x | ≥ 3.0.0 | ≥ 6.3.0 |
|---|---|---|---|---|
| Variable Key | 12 | 64 | 64 | 64 |
| Variable Data | 622 | 622 | 8642 / 10243 | 1024 |
| Function Key | 12 | 64 | 64 | 64 |
| Function Argument | 63 | 622 | 8642 / 10243 | 1024 |
| Publish/Subscribe Event Name | 64 | 64 | 64 | 64 |
| Publish/Subscribe Event Data | 255 | 622 | 8642 / 10243 | 163844 |
- Limits are in bytes of UTF-8 encoded characters, except in 6.2.0 and later, where the data can be binary.
- 2On Gen 2 devices (Photon, P1, Electron, E-Series), the limit is 864 characters.
- 3On the P2, Photon 2, and Gen 3 devices (Argon, Boron, B-Series SoM, Tracker SoM, and E404X) the limit is 1024 characters.
- The 0.8.0 - 2.x column includes all 2.x LTS versions. Higher limits will not be back-ported to 2.x LTS.
- 4Large events require Device OS 6.3.0 or later and using the CloudEvent API.
Instead of hardcoding these values, you should use these definitions:
particle::protocol::MAX_VARIABLE_KEY_LENGTHparticle::protocol::MAX_VARIABLE_VALUE_LENGTHparticle::protocol::MAX_FUNCTION_KEY_LENGTHparticle::protocol::MAX_FUNCTION_ARG_LENGTHparticle::protocol::MAX_EVENT_NAME_LENGTHparticle::protocol::MAX_EVENT_DATA_LENGTH
Additionally, some older Boron and B-Series SoM with a SARA-R410M-02B modem (LTE Cat M1) may have a limit of 782 bytes instead of 1024 bytes, see Particle.maxEventDataSize() for more information.