session-desktop/protos/DeviceMessages.proto

package textsecure;

message DeviceInit {
 required bytes masterEphemeralPubKey = 1;
 required bytes identityKeyMessage    = 2; // contains an IdentityKey
}

message IdentityKey {
 required bytes   identityKey       = 1;
 required string  phoneNumber       = 2;
 required string  server            = 3;
 required bool    masterSupportsSms = 4;
 required uint32  provisioningCode  = 5;
}

message DeviceControl {
  enum Type {
    UNKNOWN                            = 0;
    NEW_DEVICE_REGISTERED              = 1; // Requries only newDeviceId
    SENT_MESSAGE                       = 2; // Requires only message
  }
  message MessageSent {
    required string  otherNumber = 1; // The destination account (ie phone #), not device
    required uint64  timestamp   = 2;
    required bytes   message     = 3; // PushMessageContent
  }
  required Type        type        = 1;
  optional uint32      newDeviceId = 2;
  optional MessageSent message     = 3;
}