meshtastic-protobuf/mesh.proto

syntax = "proto3";

option java_package = "com.geeksville.mesh";
option optimize_for = LITE_RUNTIME;
option go_package = "github.com/meshtastic/gomeshproto";

import "portnums.proto";
import "telemetry.proto";

option java_outer_classname = "MeshProtos";

/*
 * a gps position
 */
message Position {
  /*
   * The new preferred location encoding, divide by 1e-7 to get degrees
   * in floating point
   */
  sfixed32 latitude_i = 1;

  /*
   * TODO: REPLACE
   */
  sfixed32 longitude_i = 2;

  /*
   * In meters above MSL (but see issue #359)
   */
  int32 altitude = 3;

  /*
   * This is usually not sent over the mesh (to save space), but it is sent
   * from the phone so that the local device can set its RTC If it is sent over
   * the mesh (because there are devices on the mesh without GPS), it will only
   * be sent by devices which has a hardware GPS clock.
   * seconds since 1970
   */
  fixed32 time = 9;

  /*
   * Precision positioning elements - optional and usually not included
   * ------------------------------------------------------------------
   * TODO: REMOVE/INTEGRATE
   */

  /*
   * How the location was acquired: manual, onboard GPS, external (EUD) GPS
   */
  enum LocSource {

    /*
     * TODO: REPLACE
     */
    LOCSRC_UNSPECIFIED = 0;

    /*
     * TODO: REPLACE
     */
    LOCSRC_MANUAL_ENTRY = 1;

    /*
     * TODO: REPLACE
     */
    LOCSRC_GPS_INTERNAL = 2;

    /*
     * TODO: REPLACE
     */
    LOCSRC_GPS_EXTERNAL = 3;
    /*
     * More location sources can be added here when available:
     *   GSM, radio beacons (BLE etc), location fingerprinting etc
     * TODO: REMOVE/INTEGRATE
     */
  }

  /*
   * TODO: REPLACE
   */
  LocSource location_source = 10;

  /*
   * How the altitude was acquired: manual, GPS int/ext, etc
   * Default: same as location_source if present
   */
  enum AltSource {

    /*
     * TODO: REPLACE
     */
    ALTSRC_UNSPECIFIED = 0;

    /*
     * TODO: REPLACE
     */
    ALTSRC_MANUAL_ENTRY = 1;

    /*
     * TODO: REPLACE
     */
    ALTSRC_GPS_INTERNAL = 2;

    /*
     * TODO: REPLACE
     */
    ALTSRC_GPS_EXTERNAL = 3;

    /*
     * TODO: REPLACE
     */
    ALTSRC_BAROMETRIC = 4;
  }

  /*
   * TODO: REPLACE
   */
  AltSource altitude_source = 11;

  /*
   * Positional timestamp (actual timestamp of GPS solution) in integer epoch seconds
   */
  fixed32 pos_timestamp = 12;

  /*
   * Pos. timestamp milliseconds adjustment (rarely available or required)
   */
  int32 pos_time_millis = 13;

  /*
   * HAE altitude in meters - can be used instead of MSL altitude
   */
  sint32 altitude_hae = 14;

  /*
   * Geoidal separation in meters
   */
  sint32 alt_geoid_sep = 15;

  /*
   * Horizontal, Vertical and Position Dilution of Precision, in 1/100 units
   * - PDOP is sufficient for most cases
   * - for higher precision scenarios, HDOP and VDOP can be used instead,
   *   in which case PDOP becomes redundant (PDOP=sqrt(HDOP^2 + VDOP^2))
   * TODO: REMOVE/INTEGRATE
   */
  uint32 PDOP = 16;

  /*
   * TODO: REPLACE
   */
  uint32 HDOP = 17;

  /*
   * TODO: REPLACE
   */
  uint32 VDOP = 18;

  /*
   * GPS accuracy (a hardware specific constant) in mm
   *   multiplied with DOP to calculate positional accuracy
   * Default: "'bout three meters-ish" :)
   */
  uint32 gps_accuracy = 19;

  /*
   * Ground speed in m/s and True North TRACK in 1/100 degrees
   * Clarification of terms:
   * - "track" is the direction of motion (measured in horizontal plane)
   * - "heading" is where the fuselage points (measured in horizontal plane)
   * - "yaw" indicates a relative rotation about the vertical axis
   * TODO: REMOVE/INTEGRATE
   */
  uint32 ground_speed = 20;

  /*
   * TODO: REPLACE
   */
  uint32 ground_track = 21;

  /*
   * GPS fix quality (from NMEA GxGGA statement or similar)
   */
  uint32 fix_quality = 22;

  /*
   * GPS fix type 2D/3D (from NMEA GxGSA statement)
   */
  uint32 fix_type = 23;

  /*
   * GPS "Satellites in View" number
   */
  uint32 sats_in_view = 24;

  /*
   * Sensor ID - in case multiple positioning sensors are being used
   */
  uint32 sensor_id = 25;

  /*
   * Estimated/expected time (in seconds) until next update:
   * - if we update at fixed intervals of X seconds, use X
   * - if we update at dynamic intervals (based on relative movement etc),
   *   but "AT LEAST every Y seconds", use Y
   */
  uint32 pos_next_update = 40;

  /*
   * A sequence number, incremented with each Position message to help
   *   detect lost updates if needed
   */
  uint32 pos_seq_number = 41;

  /*
   * END precision positioning elements
   * TODO: REMOVE/INTEGRATE
   */
}

/*
  * Note: these enum names must EXACTLY match the string used in the device
  * bin/build-all.sh script.
  * Because they will be used to find firmware filenames in the android app for OTA updates.
  * To match the old style filenames, _ is converted to -, p is converted to .
  */
enum HardwareModel {

  /*
   * TODO: REPLACE
   */
  UNSET = 0;

  /*
   * TODO: REPLACE
   */
  TLORA_V2 = 1;

  /*
   * TODO: REPLACE
   */
  TLORA_V1 = 2;

  /*
   * TODO: REPLACE
   */
  TLORA_V2_1_1p6 = 3;

  /*
   * TODO: REPLACE
   */
  TBEAM = 4;

  /*
   * The original heltec WiFi_Lora_32_V2, which had battery voltage sensing hooked to GPIO 13
   * (see HELTEC_V2 for the new version).
   */
  HELTEC_V2_0 = 5;

  /*
   * TODO: REPLACE
   */
  TBEAM0p7 = 6;

  /*
   * TODO: REPLACE
   */
  T_ECHO = 7;

  /*
   * TODO: REPLACE
   */
  TLORA_V1_1p3 = 8;

  /*
   * TODO: REPLACE
   */
  RAK4631 = 9;

  /*
   * The new version of the heltec WiFi_Lora_32_V2 board that has battery sensing hooked to GPIO 37.
   * Sadly they did not update anything on the silkscreen to identify this board
   */
  HELTEC_V2_1 = 10;
  
  /*
   * Ancient heltec WiFi_Lora_32 board
   */
  HELTEC_V1 = 11;
  
  /*
   * Less common/prototype boards listed here (needs one more byte over the air)
   */
  LORA_RELAY_V1 = 32;

  /*
   * TODO: REPLACE
   */
  NRF52840DK = 33;

  /*
   * TODO: REPLACE
   */
  PPR = 34;

  /*
   * TODO: REPLACE
   */
  GENIEBLOCKS = 35;

  /*
   * TODO: REPLACE
   */
  NRF52_UNKNOWN = 36;

  /*
   * TODO: REPLACE
   */
  PORTDUINO = 37;

  /*
   * The simulator built into the android app
   */
  ANDROID_SIM = 38;

  /*
   * Custom DIY device based on @NanoVHF schematics: https://github.com/NanoVHF/Meshtastic-DIY/tree/main/Schematics
   */
  DIY_V1 = 39;

  /*
   * RAK WisBlock ESP32 core: https://docs.rakwireless.com/Product-Categories/WisBlock/RAK11200/Overview/
   */
  RAK11200 = 40;

  /*
   * Reserved ID For developing private Ports. These will show up in live traffic sparsely, so we can use a high number. Keep it within 8 bits.
   */
  PRIVATE_HW = 255;
}

/*
 * The team colors are based on the names of "friendly teams" in ATAK:
 * https://github.com/deptofdefense/AndroidTacticalAssaultKit-CIV/blob/master/atak/ATAK/app/src/main/assets/filters/team_filters.xml
 */
enum Team {

  /*
   * the default (unset) is "achromatic" (unaffiliated)
   */
  CLEAR = 0;

  /*
   * TODO: REPLACE
   */
  CYAN = 1;

  /*
   * TODO: REPLACE
   */
  WHITE = 2;

  /*
   * TODO: REPLACE
   */
  YELLOW = 3;

  /*
   * TODO: REPLACE
   */
  ORANGE = 4;

  /*
   * TODO: REPLACE
   */
  MAGENTA = 5;

  /*
   * TODO: REPLACE
   */
  RED = 6;

  /*
   * TODO: REPLACE
   */
  MAROON = 7;

  /*
   * TODO: REPLACE
   */
  PURPLE = 8;
  
  /*
   * TODO: REPLACE
   */
  DARK_BLUE = 9;

  /*
   * TODO: REPLACE
   */
  BLUE = 10;

  /*
   * TODO: REPLACE
   */
  TEAL = 11;

  /*
   * TODO: REPLACE
   */
  GREEN = 12;

  /*
   * TODO: REPLACE
   */
  DARK_GREEN = 13;

  /*
   * TODO: REPLACE
   */
  BROWN = 14;
}

/*
 * Broadcast when a newly powered mesh node wants to find a node num it can use
 * Sent from the phone over bluetooth to set the user id for the owner of this node.
 * Also sent from nodes to each other when a new node signs on (so all clients can have this info)
 * The algorithm is as follows:
 * when a node starts up, it broadcasts their user and the normal flow is for all
 * other nodes to reply with their User as well (so the new node can build its nodedb)
 * If a node ever receives a User (not just the first broadcast) message where
 * the sender node number equals our node number, that indicates a collision has
 * occurred and the following steps should happen:
 * If the receiving node (that was already in the mesh)'s macaddr is LOWER than the
 * new User who just tried to sign in: it gets to keep its nodenum.
 * We send a broadcast message of OUR User (we use a broadcast so that the other node can
 * receive our message, considering we have the same id - it also serves to let
 * observers correct their nodedb) - this case is rare so it should be okay.
 * If any node receives a User where the macaddr is GTE than their local macaddr,
 * they have been vetoed and should pick a new random nodenum (filtering against
 * whatever it knows about the nodedb) and rebroadcast their User.
 * A few nodenums are reserved and will never be requested:
 * 0xff - broadcast
 * 0 through 3 - for future use
 */
message User {

  /*
   * A globally unique ID string for this user.
   * In the case of Signal that would mean +16504442323, for the default macaddr derived id it would be !<8 hexidecimal bytes>.
   * Note: app developers are encouraged to also use the following standard
   * node IDs "^all" (for broadcast), "^local" (for the locally connected node)
   */
  string id = 1;

  /*
   * A full name for this user, i.e. "Kevin Hester"
   */
  string long_name = 2;

  /*
   * A VERY short name, ideally two characters.
   * Suitable for a tiny OLED screen
   */
  string short_name = 3;

  /*
   * This is the addr of the radio.
   * Not populated by the phone, but added by the esp32 when broadcasting
   */
  bytes macaddr = 4;

  /*
   * TBEAM, HELTEC, etc...
   * Starting in 1.2.11 moved to hw_model enum in the NodeInfo object.
   * Apps will still need the string here for older builds
   * (so OTA update can find the right image), but if the enum is available it will be used instead.
   */
  HardwareModel hw_model = 6;

  /*
   * In some regions Ham radio operators have different bandwidth limitations than others.
   * If this user is a licensed operator, set this flag.
   * Also, "long_name" should be their licence number.
   */
  bool is_licensed = 7;

  /*
   * Participants in the same network can self-group into different teams.
   * Short-term this can be used to visually differentiate them on the map;
   * in the longer term it could also help users to semi-automatically
   * select or ignore messages according to team affiliation.
   * In total, 14 teams are defined (encoded in 4 bits)
   */
  Team team = 8;

  /*
   * Transmit power at antenna connector, in decibel-milliwatt
   * An optional self-reported value useful in network planning, discovery
   * and positioning - along with ant_gain_dbi and ant_azimuth below
   */
  uint32 tx_power_dbm = 10;

  /*
   * Antenna gain (applicable to both Tx and Rx), in decibel-isotropic
   */
  uint32 ant_gain_dbi = 11;

  /*
   * Directional antenna true azimuth *if applicable*, in degrees (0-360)
   * Only applicable in case of stationary nodes with a directional antenna
   * Zero = not applicable (mobile or omni) or not specified
   * (use a value of 360 to indicate an antenna azimuth of zero degrees)
   */
  uint32 ant_azimuth = 12;
}

/*
 * A message used in our Dynamic Source Routing protocol (RFC 4728 based)
 */
message RouteDiscovery {

  /*
   * The list of nodenums this packet has visited so far
   */
  repeated fixed32 route = 2;
}

/*
 * A Routing control Data packet handled by the routing module
 */
message Routing {

  /*
   * A failure in delivering a message (usually used for routing control messages, but might be provided in addition to ack.fail_id to provide
   * details on the type of failure).
   */
  enum Error {

    /*
     * This message is not a failure
     */
    NONE = 0;

    /*
     * Our node doesn't have a route to the requested destination anymore.
     */
    NO_ROUTE = 1;

    /*
     * We received a nak while trying to forward on your behalf
     */
    GOT_NAK = 2;

    /*
     * TODO: REPLACE
     */
    TIMEOUT = 3;

    /*
     * No suitable interface could be found for delivering this packet
     */
    NO_INTERFACE = 4;

    /*
     * We reached the max retransmission count (typically for naive flood routing)
     */
    MAX_RETRANSMIT = 5;

    /*
     * No suitable channel was found for sending this packet (i.e. was requested channel index disabled?)
     */
    NO_CHANNEL = 6;

    /*
     * The packet was too big for sending (exceeds interface MTU after encoding)
     */
    TOO_LARGE = 7;

    /*
     * The request had want_response set, the request reached the destination node, but no service on that node wants to send a response
     * (possibly due to bad channel permissions)
     */
    NO_RESPONSE = 8;

    /*
     * The application layer service on the remote node received your request, but considered your request somehow invalid
     */
    BAD_REQUEST = 32;

    /*
     * The application layer service on the remote node received your request, but considered your request not authorized
     * (i.e you did not send the request on the required bound channel)
     */
    NOT_AUTHORIZED = 33;
  }

  oneof variant {

    /*
     * A route request going from the requester
     */
    RouteDiscovery route_request = 1;

    /*
     * A route reply
     */
    RouteDiscovery route_reply = 2;

    /*
     * A failure in delivering a message (usually used for routing control messages, but might be provided
     * in addition to ack.fail_id to provide details on the type of failure).
     */
    Error error_reason = 3;

  }
}

/*
 * (Formerly called SubPacket)
 * The payload portion fo a packet, this is the actual bytes that are sent
 * inside a radio packet (because from/to are broken out by the comms library)
 */
message Data {

  /*
   * Formerly named typ and of type Type
   */
  PortNum portnum = 1;

  /*
   * TODO: REPLACE
   */
  bytes payload = 2;

  /*
   * Not normally used, but for testing a sender can request that recipient
   * responds in kind (i.e. if it received a position, it should unicast back it's position).
   * Note: that if you set this on a broadcast you will receive many replies.
   */
  bool want_response = 3;

  /*
   * The address of the destination node.
   * This field is is filled in by the mesh radio device software, application
   * layer software should never need it.
   * RouteDiscovery messages _must_ populate this.
   * Other message types might need to if they are doing multihop routing.
   */
  fixed32 dest = 4;

  /*
   * The address of the original sender for this message.
   * This field should _only_ be populated for reliable multihop packets (to keep
   * packets small).
   */
  fixed32 source = 5;

  /*
   * Only used in routing or response messages.
   * Indicates the original message ID that this message is reporting failure on. (formerly called original_id)
   */
  fixed32 request_id = 6;

  /*
   * If set, this message is intened to be a reply to a previously sent message with the defined id.
   */
  fixed32 reply_id = 7;

  /*
   * Defaults to false. If true, then what is in the payload should be treated as an emoji like giving
   * a message a heart or poop emoji.
   */
  fixed32 emoji = 8;

  /*
   * Location structure
   */
  Location location = 9;

}

/*
 * Location of a waypoint to associate with a message
 */
message Location {

  /*
   * Id of the location
   */
  uint32 id = 1;

  /*
   * latitude_i
   */
  sfixed32 latitude_i = 2;

  /*
   * longitude_i
   */
  sfixed32 longitude_i = 3;

  /*
   * Time the location is to expire (epoch)
   */
  uint32 expire = 4;

  /*
   * If true, only allow the original sender to update the location.
   */
  bool locked = 5;

}

/*
 * A packet envelope sent/received over the mesh
 * only payloadVariant is sent in the payload portion of the LORA packet.
 * The other fields are either not sent at all, or sent in the special 16 byte LORA header.
 */
message MeshPacket {

  /*
   * The priority of this message for sending.
   * Higher priorities are sent first (when managing the transmit queue).
   * This field is never sent over the air, it is only used internally inside of a local device node.
   * API clients (either on the local node or connected directly to the node)
   * can set this parameter if necessary.
   * (values must be <= 127 to keep protobuf field to one byte in size.
   * Detailed background on this field:
   * I noticed a funny side effect of lora being so slow: Usually when making
   * a protocol there isn’t much need to use message priority to change the order
   * of transmission (because interfaces are fairly fast).
   * But for lora where packets can take a few seconds each, it is very important
   * to make sure that critical packets are sent ASAP.
   * In the case of meshtastic that means we want to send protocol acks as soon as possible
   * (to prevent unneeded retransmissions), we want routing messages to be sent next,
   * then messages marked as reliable and finally ‘background’ packets like periodic position updates.
   * So I bit the bullet and implemented a new (internal - not sent over the air)
   * field in MeshPacket called ‘priority’.
   * And the transmission queue in the router object is now a priority queue.
   */
  enum Priority {

    /*
     * Treated as Priority.DEFAULT
     */
    UNSET = 0;

    /*
     * TODO: REPLACE
     */
    MIN = 1;

    /*
     * Background position updates are sent with very low priority -
     * if the link is super congested they might not go out at all
     */
    BACKGROUND = 10;

    /*
     * This priority is used for most messages that don't have a priority set
     */
    DEFAULT = 64;

    /*
     * If priority is unset but the message is marked as want_ack,
     * assume it is important and use a slightly higher priority
     */
    RELIABLE = 70;

    /*
     * Ack/naks are sent with very high priority to ensure that retransmission
     * stops as soon as possible
     */
    ACK = 120;

    /*
     * TODO: REPLACE
     */
    MAX = 127;
  }

  /*
   * Identify if this is a delayed packet
   */
  enum Delayed {

    /*
     * If unset, the message is being sent in real time.
     */
    NO_DELAY = 0;

    /*
     * The message is delayed and was originally a broadcast
     */
    DELAYED_BROADCAST = 1;

    /*
     * The message is delayed and was originally a direct message
     */
    DELAYED_DIRECT = 2;
  }

  /*
   * The sending node number.
   * Note: Our crypto implementation uses this field as well.
   * See [crypto](/docs/developers/firmware/encryption) for details.
   * FIXME - really should be fixed32 instead, this encoding only hurts the ble link though.
   */
  fixed32 from = 1;

  /*
   * The (immediatSee Priority description for more details.y should be fixed32 instead, this encoding only
   * hurts the ble link though.
   */
  fixed32 to = 2;

  /*
   * (Usually) If set, this indicates the index in the secondary_channels table that this packet was sent/received on.
   * If unset, packet was on the primary channel.
   * A particular node might know only a subset of channels in use on the mesh.
   * Therefore channel_index is inherently a local concept and meaningless to send between nodes.
   * Very briefly, while sending and receiving deep inside the device Router code, this field instead
   * contains the 'channel hash' instead of the index.
   * This 'trick' is only used while the payloadVariant is an 'encrypted'.
   */
  uint32 channel = 3;

  /*
   * Internally to the mesh radios we will route SubPackets encrypted per [this](docs/developers/firmware/encryption).
   * However, when a particular node has the correct
   * key to decode a particular packet, it will decode the payload into a SubPacket protobuf structure.
   * Software outside of the device nodes will never encounter a packet where
   * "decoded" is not populated (i.e. any encryption/decryption happens before reaching the applications)
   * The numeric IDs for these fields were selected to keep backwards compatibility with old applications.
   */

  oneof payloadVariant {

    /*
     * TODO: REPLACE
     */
    Data decoded = 4;

    /*
     * TODO: REPLACE
     */
    bytes encrypted = 5;
  }

  /*
   * A unique ID for this packet.
   * Always 0 for no-ack packets or non broadcast packets (and therefore take zero bytes of space).
   * Otherwise a unique ID for this packet, useful for flooding algorithms.
   * ID only needs to be unique on a _per sender_ basis, and it only
   * needs to be unique for a few minutes (long enough to last for the length of
   * any ACK or the completion of a mesh broadcast flood).
   * Note: Our crypto implementation uses this id as well.
   * See [crypto](/docs/developers/firmware/encryption) for details.
   * FIXME - really should be fixed32 instead, this encoding only
   * hurts the ble link though.
   */
  fixed32 id = 6;

  /*
   * The time this message was received by the esp32 (secs since 1970).
   * Note: this field is _never_ sent on the radio link itself (to save space) Times
   * are typically not sent over the mesh, but they will be added to any Packet
   * (chain of SubPacket) sent to the phone (so the phone can know exact time of reception)
   */
  fixed32 rx_time = 7;

  /*
   * *Never* sent over the radio links.
   * Set during reception to indicate the SNR of this packet.
   * Used to collect statistics on current link quality.
   */
  float rx_snr = 8;

  /*
   * If unset treated as zero (no forwarding, send to adjacent nodes only)
   * if 1, allow hopping through one node, etc...
   * For our usecase real world topologies probably have a max of about 3.
   * This field is normally placed into a few of bits in the header.
   */
  uint32 hop_limit = 10;

  /*
   * This packet is being sent as a reliable message, we would prefer it to arrive at the destination.
   * We would like to receive a ack packet in response.
   * Broadcasts messages treat this flag specially: Since acks for broadcasts would
   * rapidly flood the channel, the normal ack behavior is suppressed.
   * Instead, the original sender listens to see if at least one node is rebroadcasting this packet (because naive flooding algorithm).
   * If it hears that the odds (given typical LoRa topologies) the odds are very high that every node should eventually receive the message.
   * So FloodingRouter.cpp generates an implicit ack which is delivered to the original sender.
   * If after some time we don't hear anyone rebroadcast our packet, we will timeout and retransmit, using the regular resend logic.
   * Note: This flag is normally sent in a flag bit in the header when sent over the wire
   */
  bool want_ack = 11;

  /*
   * The priority of this message for sending.
   * See MeshPacket.Priority description for more details.
   */
  Priority priority = 12;

  /*
   * rssi of received packet. Only sent to phone for dispay purposes.
   */
  int32 rx_rssi = 13;

  /*
   * Describe if this message is delayed
   */
  Delayed delayed = 15;

}

/*
 * Shared constants between device and phone
 */
enum Constants {

  /*
   * First enum must be zero, and we are just using this enum to
   * pass int constants between two very different environments
   */
  Unused = 0;

  /*
   * From mesh.options
   * note: this payload length is ONLY the bytes that are sent inside of the Data protobuf (excluding protobuf overhead). The 16 byte header is
   * outside of this envelope
   */
  DATA_PAYLOAD_LEN = 237;
}

/*
 * The bluetooth to device link:
 * Old BTLE protocol docs from TODO, merge in above and make real docs...
 * use protocol buffers, and NanoPB
 * messages from device to phone:
 * POSITION_UPDATE (..., time)
 * TEXT_RECEIVED(from, text, time)
 * OPAQUE_RECEIVED(from, payload, time) (for signal messages or other applications)
 * messages from phone to device:
 * SET_MYID(id, human readable long, human readable short) (send down the unique ID
 * string used for this node, a human readable string shown for that id, and a very
 * short human readable string suitable for oled screen) SEND_OPAQUE(dest, payload)
 * (for signal messages or other applications) SEND_TEXT(dest, text) Get all
 * nodes() (returns list of nodes, with full info, last time seen, loc, battery
 * level etc) SET_CONFIG (switches device to a new set of radio params and
 * preshared key, drops all existing nodes, force our node to rejoin this new group)
 * Full information about a node on the mesh
 */
message NodeInfo {

  /*
   * The node number
   */
  uint32 num = 1;

  /*
   * The user info for this node
   */
  User user = 2;

  /*
   * This position data. Note: before 1.2.14 we would also store the last time we've heard from this node in position.time, that is no longer true.
   * Position.time now indicates the last time we received a POSITION from that node.
   */
  Position position = 3;

  /*
   * Returns the Signal-to-noise ratio (SNR) of the last received message,
   * as measured by the receiver. Return SNR of the last received message in dB
   */
  float snr = 4;

  /*
   * TODO: REMOVE/INTEGRATE 
   * Returns the last measured frequency error.
   * The LoRa receiver estimates the frequency offset between the receiver
   * center frequency and that of the received LoRa signal. This function
   * returns the estimates offset (in Hz) of the last received message.
   * Caution: this measurement is not absolute, but is measured relative to the
   * local receiver's oscillator. Apparent errors may be due to the
   * transmitter, the receiver or both. \return The estimated center frequency
   * offset in Hz of the last received message.
   * int32 frequency_error = 6;
   * enum RouteState {
   *  Invalid = 0;
   *  Discovering = 1;
   *  Valid = 2;
   * }
   * Not needed?
   * RouteState route = 4;
   */

  /*
   * TODO: REMOVE/INTEGRATE
   * Not currently used (till full DSR deployment?) Our current preferred node node for routing - might be the same as num if
   * we are adjacent Or zero if we don't yet know a route to this node.
   * fixed32 next_hop = 5;
   */

  /*
   * Set to indicate the last time we received a packet from this node
   */
  fixed32 last_heard = 5;
  /*
   * The latest device telemetry data for the node.
   */
  Telemetry telemetry = 6;
}

/*
 * Error codes for critical errors
 * The device might report these fault codes on the screen.
 * If you encounter a fault code, please post on the meshtastic.discourse.group
 * and we'll try to help.
 */
enum CriticalErrorCode {

  /*
   * TODO: REPLACE
   */
  None = 0;

  /*
   * A software bug was detected while trying to send lora
   */
  TxWatchdog = 1;

  /*
   * A software bug was detected on entry to sleep
   */
  SleepEnterWait = 2;

  /*
   * No Lora radio hardware could be found
   */
  NoRadio = 3;

  /*
   * Not normally used
   */
  Unspecified = 4;

  /*
   * We failed while configuring a UBlox GPS
   */
  UBloxInitFailed = 5;

  /*
   * This board was expected to have a power management chip and it is missing or broken
   */
  NoAXP192 = 6;

  /*
   * The channel tried to set a radio setting which is not supported by this chipset,
   * radio comms settings are now undefined.
   */
  InvalidRadioSetting = 7;

  /*
   * Radio transmit hardware failure. We sent data to the radio chip, but it didn't
   * reply with an interrupt.
   */
  TransmitFailed = 8;

  /*
   * We detected that the main CPU voltage dropped below the minumum acceptable value
   */
  Brownout = 9;

  /* Selftest of SX1262 radio chip failed */
  SX1262Failure = 10;

  /*
   * A (likely software but possibly hardware) failure was detected while trying to send packets.
   * If this occurs on your board, please post in the forum so that we can ask you to collect some information to allow fixing this bug
   */
  RadioSpiBug = 11;
}

/*
 * Unique local debugging info for this node
 * Note: we don't include position or the user info, because that will come in the
 * Sent to the phone in response to WantNodes.
 */
message MyNodeInfo {

  /*
   * Tells the phone what our node number is, default starting value is
   * lowbyte of macaddr, but it will be fixed if that is already in use
   */
  uint32 my_node_num = 1;

  /*
   * Note: This flag merely means we detected a hardware GPS in our node.
   * Not the same as UserPreferences.location_sharing
   */
  bool has_gps = 2;

  /*
   * The maximum number of 'software' channels that can be set on this node.
   */
  uint32 max_channels = 15;

  /*
   * Deprecated! ONLY USED IN DEVICE CODE (for upgrading old 1.0 firmwares) DO NOT READ ELSEWHERE.
   * The region code for my radio (US, CN, etc...)
   * Note: This string is deprecated.
   * The 1.0 builds populate it based on the flashed firmware name.
   * But for newer builds this string will be unpopulated (missing/null).
   * For those builds you should instead look at the new read/write region enum in UserSettings
   * The format of this string was 1.0-US or 1.0-CN etc.. Or empty string if unset.
   */
  string region = 4 [deprecated = true];

  /*
   * 0.0.5 etc...
   */
  string firmware_version = 6;

  /*
   * An error message we'd like to report back to the mothership through analytics.
   * It indicates a serious bug occurred on the device, the device coped with it,
   * but we still want to tell the devs about the bug.
   * This field will be cleared after the phone reads MyNodeInfo
   * (i.e. it will only be reported once)
   * a numeric error code to go with error message, zero means no error
   */
  CriticalErrorCode error_code = 7;

  /*
   * A numeric error address (nonzero if available)
   */
  uint32 error_address = 8;

  /*
   * The total number of errors this node has ever encountered
   * (well - since the last time we discarded preferences)
   */
  uint32 error_count = 9;

  /*
   * The total number of reboots this node has ever encountered
   * (well - since the last time we discarded preferences)
   */
  uint32 reboot_count = 10;

  /*
   * Calculated bitrate of the current channel (in Bytes Per Second)
   */
  float bitrate = 11;

  /*
   * How long before we consider a message abandoned and we can clear our
   * caches of any messages in flight Normally quite large to handle the worst case
   * message delivery time, 5 minutes.
   * Formerly called FLOOD_EXPIRE_TIME in the device code
   */
  uint32 message_timeout_msec = 13;

  /*
   * The minimum app version that can talk to this device.
   * Phone/PC apps should compare this to their build number and if too low tell the user they must update their app
   */
  uint32 min_app_version = 14;

  /*
   * 24 time windows of 1hr each with the airtime transmitted out of the device per hour.
   */
  repeated uint32 air_period_tx = 16;

  /*
   * 24 time windows of 1hr each with the airtime of valid packets for your mesh.
   */
  repeated uint32 air_period_rx = 17;

  /*
   * Is the device wifi capable?
   */
  bool has_wifi = 18;

  /*
   * Utilization for the current channel, including well formed TX, RX and malformed RX (aka noise).
   */
  float channel_utilization = 19;
  
  /*
   * Percent of airtime for transmission used within the last hour.
   */
  float air_util_tx = 20;
}

/*
 * Debug output from the device.
 * To minimize the size of records inside the device code, if a time/source/level is not set
 * on the message it is assumed to be a continuation of the previously sent message.
 * This allows the device code to use fixed maxlen 64 byte strings for messages,
 * and then extend as needed by emitting multiple records.
 */
message LogRecord {

  /*
   * Log levels, chosen to match python logging conventions.
   */
  enum Level {
    /*
     * Log levels, chosen to match python logging conventions.
     */
    UNSET = 0;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    CRITICAL = 50;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    ERROR = 40;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    WARNING = 30;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    INFO = 20;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    DEBUG = 10;

    /*
     * Log levels, chosen to match python logging conventions.
     */
    TRACE = 5;
  }

  /*
   * Log levels, chosen to match python logging conventions.
   */
  string message = 1;

  /*
   * Seconds since 1970 - or 0 for unknown/unset
   */
  fixed32 time = 2;

  /*
   * Usually based on thread name - if known
   */
  string source = 3;

  /*
   * Not yet set
   */
  Level level = 4;
}

/*
 * Packets from the radio to the phone will appear on the fromRadio characteristic.
 * It will support READ and NOTIFY. When a new packet arrives the device will BLE notify?
 * It will sit in that descriptor until consumed by the phone,
 * at which point the next item in the FIFO will be populated.
 */
message FromRadio {

  /*
   * In the <1.2 versions packet had ID 2, to prevent confusing old apps with our new packets, we've changed
   */
  reserved 2;

  /*
   * In the <1.2 versions nodeinfo had ID 4, to prevent confusing old apps with our new packets, we've changed
   */
  reserved 6;

  /*
   * The packet id, used to allow the phone to request missing read packets from the FIFO,
   * see our bluetooth docs
   */
  uint32 id = 1;

  /*
   * Log levels, chosen to match python logging conventions.
   */
  oneof payloadVariant {

    /*
     * Log levels, chosen to match python logging conventions.
     */
    MeshPacket packet = 11;

    /*
     * Tells the phone what our node number is, can be -1 if we've not yet joined a mesh.
     * NOTE: This ID must not change - to keep (minimal) compatibility with <1.2 version of android apps.
     */
    MyNodeInfo my_info = 3;

    /*
     * One packet is sent for each node in the on radio DB
     * starts over with the first node in our DB
     */
    NodeInfo node_info = 4;

    /*
     * Set to send debug console output over our protobuf stream
     */
    LogRecord log_record = 7;

    /*
     * Sent as true once the device has finished sending all of the responses to want_config
     * recipient should check if this ID matches our original request nonce, if
     * not, it means your config responses haven't started yet.
     * NOTE: This ID must not change - to keep (minimal) compatibility with <1.2 version of android apps.
     */
    uint32 config_complete_id = 8;

    /*
     * Sent to tell clients the radio has just rebooted.
     * Set to true if present.
     * Not used on all transports, currently just used for the serial console.
     * NOTE: This ID must not change - to keep (minimal) compatibility with <1.2 version of android apps.
     */
    bool rebooted = 9;

  }
}


/*
 * Packets/commands to the radio will be written (reliably) to the toRadio characteristic.
 * Once the write completes the phone can assume it is handled.
 */
message ToRadio {

  /*
   * Instead of sending want_config_id as a uint32, newer clients send this structure with information about the client.
   */
  message PeerInfo {

    /*
     * The numeric version code for the client application, which in some cases are used to control device behavior (so the device can
     * make assumptions about who is using the API.
     */
    uint32 app_version = 1;

    /*
     * True if the peer device can gateway MQTT packets.
     * If true, the device will not try to send packets to the internet directly,
     * instead it will pass the packets to the peer for dispatching.
     * This feature is optional, if set to false the device will assume the client can not gateway to MQTT.
     */
    bool mqtt_gateway = 2;
  }

  /*
   * In the <1.2 versions packet had ID 2, to prevent confusing old apps with our new packets, we've changed.
   * 101-103 were used for set_radio, set_owner, set_channel
   */
  reserved 1, 101, 102, 103;

  /*
   * Log levels, chosen to match python logging conventions.
   */
  oneof payloadVariant {

    /*
     * Send this packet on the mesh
     */
    MeshPacket packet = 2;

    /*
     * Information about the peer, sent after the phone sneds want_config_id.
     * Old clients do not send this, which is fine.
     */
    PeerInfo peer_info = 3;

    /*
     * Phone wants radio to send full node db to the phone, This is
     * typically the first packet sent to the radio when the phone gets a
     * bluetooth connection. The radio will respond by sending back a
     * MyNodeInfo, a owner, a radio config and a series of
     * FromRadio.node_infos, and config_complete
     * the integer you write into this field will be reported back in the
     * config_complete_id response this allows clients to never be confused by
     * a stale old partially sent config.
     */
    uint32 want_config_id = 100;

    /*
     * Tell API server we are disconnecting now.
     * This is useful for serial links where there is no hardware/protocol based notification that the client has dropped the link.
     * (Sending this message is optional for clients)
     */
    bool disconnect = 104;
  }
}