| Field | Type | Description |
|---|---|---|
| Message Type | Varint | |
| Message Size | Varint |
| Message Type | Value | Description |
|---|---|---|
| Reserved | 0x00 | Field that cannot be used |
| OK | 0x01 | Success on request |
| Error | 0x02 | Error on request |
| Keep Alive | 0x03 | Keep connection alive |
| Run | 0x04 | Execute a resource or a broker action |
| Start Stream | 0x05 | Start stream channel for sampling interval or receive events over a resource. |
| Stop Stream | 0x06 | Stop the ongoing stream |
| Describe | 0x07 | Describe available resources |
| Connect | 0x08 | Establish a connection and its parameters |
| Disconnect | 0x09 | Disconnect the current connection |
| Stream Event | 0x0A | Stream an unscheduled event |
| Stream Sample | 0x0B | Stream an scheduled sample |