> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/cerulean-ping-protocol/general-packet-definitions.md).

# General Packet Definitions

This table lists some general packet IDs that may be shared among various devices. Click on the packet name to go to the payload definition for that packet type.

| Packet Name                                                                                                   | Packet ID |
| ------------------------------------------------------------------------------------------------------------- | --------- |
| [NOP](/c/cerulean-ping-protocol/general-packet-definitions/nop.md)                                            | 0         |
| [ACK](/c/cerulean-ping-protocol/general-packet-definitions/ack.md)                                            | 1         |
| [NACK](/c/cerulean-ping-protocol/general-packet-definitions/nack.md)                                          | 2         |
| [ASCII\_TEXT](/c/cerulean-ping-protocol/general-packet-definitions/ascii_text.md)                             | 3         |
| [DEVICE\_INFORMATION](/c/cerulean-ping-protocol/general-packet-definitions/device_information.md)             | 4         |
| [JSON\_WRAPPER](/c/cerulean-ping-protocol/general-packet-definitions/json_wrapper.md)                         | 10        |
| [NMEA\_WRAPPER](/c/cerulean-ping-protocol/general-packet-definitions/nmea_wrapper.md)                         | 109       |
| [MAVLINK\_WRAPPER](/c/cerulean-ping-protocol/general-packet-definitions/mavlink_wrapper.md)                   | 150       |
| [SYNC\_CHANNEL\_NUMBER](/c/cerulean-ping-protocol/general-packet-definitions/sync_channel_number.md)          | 169       |
| [SET\_SYNC\_CHANNEL\_NUMBER](/c/cerulean-ping-protocol/general-packet-definitions/set_sync_channel_number.md) | 170       |
|                                                                                                               |           |
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