404 lines
15 KiB
C
404 lines
15 KiB
C
/*
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* The MySensors Arduino library handles the wireless radio link and protocol
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* between your home built sensors/actuators and HA controller of choice.
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* The sensors forms a self healing radio network with optional repeaters. Each
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* repeater and gateway builds a routing tables in EEPROM which keeps track of the
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* network topology allowing messages to be routed to nodes.
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*
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* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
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* Copyright (C) 2013-2015 Sensnology AB
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* Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
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*
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* Documentation: http://www.mysensors.org
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* Support Forum: http://forum.mysensors.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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/**
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* @file MyTransport.h
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*
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* @defgroup MyTransportgrp MyTransport
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* @ingroup internals
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* @{
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*
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* Transport-related log messages, format: [!]SYSTEM:[SUB SYSTEM:]MESSAGE
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* - [!] Exclamation mark is prepended in case of error
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* - SYSTEM:
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* - <b>TSM</b>: messages emitted by the transport state machine
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* - <b>TSF</b>: messages emitted by transport support functions
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* - SUB SYSTEMS:
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* - Transport state machine (<b>TSM</b>)
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* - TSM:INIT from <b>stInit</b> Initialize transport and radio
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* - TSM:FPAR from <b>stParent</b> Find parent
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* - TSM:ID from <b>stID</b> Check/request node ID, if dynamic node ID set
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* - TSM:UPL from <b>stUplink</b> Verify uplink connection by pinging GW
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* - TSM:READY from <b>stReady</b> Transport is ready and fully operational
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* - TSM:FAILURE from <b>stFailure</b> Failure in transport link or transport HW
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* - Transport support function (<b>TSF</b>)
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* - TSF:CHKUPL from @ref transportCheckUplink(), checks connection to GW
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* - TSF:ASID from @ref transportAssignNodeID(), assigns node ID
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* - TSF:PING from @ref transportPingNode(), pings a node
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* - TSF:CRT from @ref transportClearRoutingTable(), clears routing table stored in EEPROM
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* - TSF:MSG from @ref transportProcessMessage(), processes incoming message
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* - TSF:SANCHK from @ref transportInvokeSanityCheck(), calls transport-specific sanity check
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* - TSF:ROUTE from @ref transportRouteMessage(), sends message
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* - TSF:SEND from @ref transportSendRoute(), sends message if transport is ready (exposed)
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*
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* Transport debug log messages:
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*
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* |E| SYS | SUB | Message | Comment
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* |-|------|-----------|-----------------------|---------------------------------------------------------------------
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* | | TSM | INIT | | <b>Transition to stInit state</b>
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* | | TSM | INIT | STATID,ID=%%d | Node ID is static
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* | | TSM | INIT | TSP OK | Transport device configured and fully operational
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* | | TSM | INIT | GW MODE | Node is set up as GW, thus omitting ID and findParent states
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* |!| TSM | INIT | TSP FAIL | Transport device initialization failed
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* | | TSM | FPAR | | <b>Transition to stParent state</b>
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* | | TSM | FPAR | STATP=%%d | Static parent set, skip finding parent
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* | | TSM | FPAR | OK | Parent node identified
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* |!| TSM | FPAR | NO REPLY | No potential parents replied to find parent request
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* |!| TSM | FPAR | FAIL | Finding parent failed
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* | | TSM | ID | | <b>Transition to stID state</b>
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* | | TSM | ID | OK,ID=%%d | Node ID is valid
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* | | TSM | ID | REQ | Request node ID from controller
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* |!| TSM | ID | FAIL,ID=%%d | ID verification failed, ID invalid
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* | | TSM | UPL | | <b>Transition to stUplink state</b>
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* | | TSM | UPL | OK | Uplink OK, GW returned ping
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* |!| TSM | UPL | FAIL | Uplink check failed, i.e. GW could not be pinged
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* | | TSM | READY | | <b>Transition to stReady</b>, i.e. transport is ready and fully operational
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* |!| TSM | READY | UPL FAIL,SNP | Too many failed uplink transmissions, search new parent
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* |!| TSM | READY | FAIL,STATP | Too many failed uplink transmissions, static parent enforced
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* | | TSM | FAILURE | | <b>Transition to stFailure state</b>
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* | | TSM | FAILURE | PDT | Power-down transport
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* | | TSM | FAILURE | RE-INIT | Attempt to re-initialize transport
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* | | TSF | CHKUPL | OK | Uplink OK
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* | | TSF | CHKUPL | OK,FCTRL | Uplink OK, flood control prevents pinging GW in too short intervals
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* | | TSF | CHKUPL | DGWC,O=%%d,N=%%d | Uplink check revealed changed network topology, old distance (O), new distance (N)
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* | | TSF | CHKUPL | FAIL | No reply received when checking uplink
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* | | TSF | ASID | OK,ID=%%d | Node ID assigned
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* |!| TSF | ASID | FAIL,ID=%%d | Assigned ID is invalid
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* | | TSF | PING | SEND,TO=%%d | Send ping to destination (TO)
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* | | TSF | MSG | ACK REQ | ACK message requested
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* | | TSF | MSG | ACK | ACK message, do not proceed but forward to callback
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* | | TSF | MSG | FPAR RES,ID=%%d,D=%%d | Response to find parent received from node (ID) with distance (D) to GW
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* | | TSF | MSG | FPAR PREF FOUND | Preferred parent found, i.e. parent defined via MY_PARENT_NODE_ID
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* | | TSF | MSG | FPAR OK,ID=%%d,D=%%d | Find parent response from node (ID) is valid, distance (D) to GW
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* | | TSF | MSG | FPAR INACTIVE | Find parent response received, but no find parent request active, skip response
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* | | TSF | MSG | FPAR REQ,ID=%%d | Find parent request from node (ID)
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* | | TSF | MSG | PINGED,ID=%%d,HP=%%d | Node pinged by node (ID) with (HP) hops
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* | | TSF | MSG | PONG RECV,HP=%%d | Pinged node replied with (HP) hops
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* | | TSF | MSG | BC | Broadcast message received
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* | | TSF | MSG | GWL OK | Link to GW ok
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* | | TSF | MSG | FWD BC MSG | Controlled broadcast message forwarding
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* | | TSF | MSG | REL MSG | Relay message
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* | | TSF | MSG | REL PxNG,HP=%%d | Relay PING/PONG message, increment hop counter (HP)
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* |!| TSF | MSG | PVER,%%d!=%%d | Message protocol version mismatch
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* |!| TSF | MSG | SIGN VERIFY FAIL | Signing verification failed
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* |!| TSF | MSG | REL MSG,NORP | Node received a message for relaying, but node is not a repeater, message skipped
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* |!| TSF | MSG | SIGN FAIL | Signing message failed
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* |!| TSF | MSG | GWL FAIL | GW uplink failed
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* | | TSF | SANCHK | OK | Sanity check passed
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* |!| TSF | SANCHK | FAIL | Sanity check failed, attempt to re-initialize radio
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* | | TSF | CRT | OK | Clearing routing table successful
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* |!| TSF | ROUTE | FPAR ACTIVE | Finding parent active, message not sent
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* |!| TSF | ROUTE | DST %%d UNKNOWN | Routing for destination (DST) unknown, send message to parent
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* |!| TSF | SEND | TNR | Transport not ready, message cannot be sent
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*
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* Incoming / outgoing messages:
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*
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* See <a href="https://www.mysensors.org/download/serial_api_20">here</a> for more detail on the format and definitons.
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*
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* Receiving a message
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* - TSF:MSG:READ,sender-last-destination,s=%%d,c=%%d,t=%%d,pt=%%d,l=%%d,sg=%%d:%%s
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*
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* Sending a message
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* - [!]TSF:MSG:SEND,sender-last-next-destination,s=%%d,c=%%d,t=%%d,pt=%%d,l=%%d,sg=%%d,ft=%%d,st=%%s:%%s
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*
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* Message fields:
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* - <b>s</b>=sensor ID
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* - <b>c</b>=command
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* - <b>t</b>=msg type
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* - <b>pt</b>=payload type
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* - <b>l</b>=length
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* - <b>ft</b>=failed uplink transmission counter
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* - <b>sg</b>=signing flag
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*
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* @brief API declaration for MyTransport
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*
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*/
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#ifndef MyTransport_h
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#define MyTransport_h
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#include "MySensorsCore.h"
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// debug
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#if defined(MY_DEBUG)
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#define TRANSPORT_DEBUG(x,...) debug(x, ##__VA_ARGS__) //!< debug
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#else
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#define TRANSPORT_DEBUG(x,...) //!< debug NULL
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#endif
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#if defined(MY_REPEATER_FEATURE)
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#define TRANSMISSION_FAILURES 10 //!< search for a new parent node after this many transmission failures, higher threshold for repeating nodes
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#else
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#define TRANSMISSION_FAILURES 5 //!< search for a new parent node after this many transmission failures, lower threshold for non-repeating nodes
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#endif
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#if defined(MY_RX_MESSAGE_BUFFER_FEATURE)
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#if defined(MY_RADIO_RFM69)
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#error Receive message buffering not supported for RFM69!
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#endif
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#if defined(MY_RS485)
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#error Receive message buffering not supported for RS485!
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#endif
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#elif !defined(MY_RX_MESSAGE_BUFFER_FEATURE) && defined(MY_RX_MESSAGE_BUFFER_SIZE)
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#error Receive message buffering requires message buffering feature enabled!
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#endif
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#define TIMEOUT_FAILURE_STATE 10000 //!< duration failure state
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#define STATE_TIMEOUT 2000 //!< general state timeout
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#define STATE_RETRIES 3 //!< retries before switching to FAILURE
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#define AUTO 255 //!< ID 255 is reserved for auto initialization of nodeId.
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#define BROADCAST_ADDRESS ((uint8_t)255) //!< broadcasts are addressed to ID 255
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#define DISTANCE_INVALID ((uint8_t)255) //!< invalid distance when searching for parent
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#define MAX_HOPS ((uint8_t)254) //!< maximal mumber of hops for ping/pong
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#define INVALID_HOPS ((uint8_t)255) //!< invalid hops
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#define MAX_SUBSEQ_MSGS 5 //!< Maximum number of subsequentially processed messages in FIFO (to prevent transport deadlock if HW issue)
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#define CHKUPL_INTERVAL ((uint32_t)10000) //!< Minimum time interval to re-check uplink
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#define _autoFindParent (bool)(MY_PARENT_NODE_ID == AUTO) //!< returns true if static parent id is undefined
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#define isValidDistance(distance) (bool)(distance!=DISTANCE_INVALID) //!< returns true if distance is valid
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#define isValidParent(parent) (bool)(parent != AUTO) //!< returns true if parent is valid
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/**
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* @brief SM state
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*
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* This structure stores SM state definitions
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*/
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struct transportState {
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void(*Transition)(); //!< state transition function
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void(*Update)(); //!< state update function
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};
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/**
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* @brief Status variables and SM state
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*
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* This structure stores transport status and SM variables
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*/
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typedef struct {
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transportState* currentState; //!< pointer to current fsm state
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uint32_t stateEnter; //!< state enter timepoint
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uint32_t lastUplinkCheck; //!< last uplink check, required to prevent GW flooding
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uint32_t lastSanityCheck; //!< last sanity check
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// 8 bits
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bool findingParentNode : 1; //!< flag finding parent node is active
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bool preferredParentFound : 1; //!< flag preferred parent found
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bool uplinkOk : 1; //!< flag uplink ok
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bool pingActive : 1; //!< flag ping active
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bool transportActive : 1; //!< flag transport active
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uint8_t reserved : 3; //!< reserved
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// 8 bits
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uint8_t retries : 4; //!< retries / state re-enter
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uint8_t failedUplinkTransmissions : 4; //!< counter failed uplink transmissions
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// 8 bits
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uint8_t pingResponse; //!< stores hops received in I_PONG
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} __attribute__((packed)) transportSM;
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// PRIVATE functions
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/**
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* @brief Initialize SM variables and transport HW
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*/
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void stInitTransition();
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/**
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* @brief Find parent
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*/
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void stParentTransition();
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/**
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* @brief Verify find parent responses
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*/
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void stParentUpdate();
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/**
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* @brief Send ID request
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*/
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void stIDTransition();
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/**
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* @brief Verify ID response and GW link
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*/
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void stIDUpdate();
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/**
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* @brief Send uplink ping request
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*/
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void stUplinkTransition();
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/**
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* @brief Set transport OK
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*/
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void stReadyTransition();
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/**
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* @brief Monitor transport link
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*/
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void stReadyUpdate();
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/**
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* @brief Transport failure and power down radio
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*/
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void stFailureTransition();
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/**
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* @brief Re-initialize transport after timeout
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*/
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void stFailureUpdate();
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/**
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* @brief Switch SM state
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* @param newState New state to switch SM to
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*/
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void transportSwitchSM(transportState& newState);
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/**
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* @brief Update SM state
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*/
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void transportUpdateSM();
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/**
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* @brief Request time in current SM state
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* @return ms in current state
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*/
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uint32_t transportTimeInState();
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/**
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* @brief Call transport driver sanity check
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*/
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void transportInvokeSanityCheck();
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/**
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* @brief Process all pending messages in RX FIFO
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*/
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void transportProcessFIFO();
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/**
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* @brief Receive message from RX FIFO and process
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*/
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void transportProcessMessage();
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/**
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* @brief Assign node ID
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* @param newNodeId New node ID
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* @return true if node ID valid and successfully assigned
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*/
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bool transportAssignNodeID(uint8_t newNodeId);
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/**
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* @brief Wait and process messages for a defined amount of time until specified message received
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* @param ms Time to wait and process incoming messages in ms
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* @param cmd Specific command
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* @param msgtype Specific message type
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* @return true if specified command received within waiting time
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*/
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bool transportWait(uint32_t ms, uint8_t cmd, uint8_t msgtype);
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/**
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* @brief Ping node
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* @param targetId Node to be pinged
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* @return hops from pinged node or 255 if no answer received within 2000ms
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*/
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uint8_t transportPingNode(uint8_t targetId);
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/**
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* @brief Send and route message according to destination
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*
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* This function is used in MyTransport and omits the transport state check, i.e. message can be sent even if transport is not ready
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*
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* @param message
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* @return true if message sent successfully
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*/
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bool transportRouteMessage(MyMessage &message);
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/**
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* @brief Send and route message according to destination with transport state check
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* @param message
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* @return true if message sent successfully and false if sending error or transport !OK
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*/
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bool transportSendRoute(MyMessage &message);
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/**
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* @brief Send message to recipient
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* @param to Recipient of message
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* @param message
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* @return true if message sent successfully
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*/
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bool transportSendWrite(uint8_t to, MyMessage &message);
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/**
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* @brief Check uplink to GW, includes flooding control
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* @param force to override flood control timer
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* @return true if uplink ok
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*/
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bool transportCheckUplink(bool force);
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// PUBLIC functions
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/**
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* @brief Initialize transport and SM
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*/
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void transportInitialize();
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/**
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* @brief Process FIFO msg and update SM
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*/
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void transportProcess();
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/**
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* @brief Flag transport ready
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* @return true if transport is initialize and ready
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*/
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bool isTransportReady();
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/**
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* @brief Flag searching parent ongoing
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* @return true if transport is searching for parent
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*/
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bool isTransportSearchingParent();
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/**
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* @brief Clear routing table
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*/
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void transportClearRoutingTable();
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/**
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* @brief Return heart beat, i.e. ms in current state
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*/
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uint32_t transportGetHeartbeat();
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// interface functions for radio driver
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/**
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* @brief Initialize transport HW
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* @return true if initialization successful
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*/
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bool transportInit();
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/**
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* @brief Set node address
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*/
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void transportSetAddress(uint8_t address);
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/**
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* @brief Retrieve node address
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*/
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uint8_t transportGetAddress();
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/**
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* @brief Send message
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* @param to recipient
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* @param data message to be sent
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* @param len length of message (header + payload)
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* @return true if message sent successfully
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*/
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bool transportSend(uint8_t to, const void* data, uint8_t len);
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/**
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* @brief Verify if RX FIFO has pending messages
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* @return true if message available in RX FIFO
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*/
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bool transportAvailable();
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/**
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* @brief Sanity check for transport: is transport still responsive?
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* @return true transport ok
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*/
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bool transportSanityCheck();
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/**
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* @brief Receive message from FIFO
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* @return length of recevied message (header + payload)
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*/
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uint8_t transportReceive(void* data);
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/**
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* @brief Power down transport HW
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*/
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void transportPowerDown();
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#endif // MyTransport_h
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/** @}*/
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