Common.Message.Timesync (xmavlink_util v0.4.3)

Summary

Types

t()

Time synchronization message. The message is used for both timesync requests and responses. The request is sent with ts1=syncing component timestamp and tc1=0, and may be broadcast or targeted to a specific system/component. The response is sent with ts1=syncing component timestamp (mirror back unchanged), and tc1=responding component timestamp, with the target_system and target_component set to ids of the original request. Systems can determine if they are receiving a request or response based on the value of tc. If the response has target_system==target_component==0 the remote system has not been updated to use the component IDs and cannot reliably timesync; the requestor may report an error. Timestamps are UNIX Epoch time or time since system boot in nanoseconds (the timestamp format can be inferred by checking for the magnitude of the number; generally it doesn't matter as only the offset is used). The message sequence is repeated numerous times with results being filtered/averaged to estimate the offset.

Types

t()

@type t() :: %Common.Message.Timesync{
  target_component: XMAVLink.Types.uint8_t(),
  target_system: XMAVLink.Types.uint8_t(),
  tc1: XMAVLink.Types.int64_t(),
  ts1: XMAVLink.Types.int64_t()
}