mirror of https://github.com/arendst/Tasmota.git
395 lines
14 KiB
C++
395 lines
14 KiB
C++
/*
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xdrv_57_1_tasmesh_support.ino - Mesh via ESP-Now support for Tasmota
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Copyright (C) 2021 Christian Baars and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_TASMESH
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#include <queue>
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#include <t_bearssl_block.h>
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#ifdef ESP32
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#include <esp_now.h>
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#include <esp_wifi.h>
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#else
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#include <espnow.h>
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#endif //ESP32
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/*********************************************************************************************\
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* constants
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\*********************************************************************************************/
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#define D_CMND_MESH "MESH"
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#define MESH_PAYLOAD_SIZE 160 // Default 160 - with header of 20 bytes and 16 bytes tag, stays below 200 bytes, which is reported to work with ESP8266
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#define MESH_TOPICSZ 64 // Max supported topic size
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#define MESH_BUFFERS 26 // (6) Max buffers number for splitted messages
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#define MESH_MAX_PACKETS 3 // (3) Max number of packets
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#define MESH_REFRESH 50 // Number of ms
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// The format of the vendor-specific action frame is as follows:
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// ------------------------------------------------------------------------------------------------------------
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// | MAC Header | Category Code | Organization Identifier | Random Values | Vendor Specific Content | FCS |
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// ------------------------------------------------------------------------------------------------------------
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// 24 bytes 1 byte 3 bytes 4 bytes 7~255 bytes 4 bytes
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//
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// The Vendor Specific Content contains vendor-specific fields as follows:
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// -------------------------------------------------------------------------------
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// | Element ID | Length | Organization Identifier | Type | Version | Body |
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// -------------------------------------------------------------------------------
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// 1 byte 1 byte 3 bytes 1 byte 1 byte 0~250 bytes
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struct mesh_packet_t {
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uint8_t sender[6]; // MAC
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uint8_t receiver[6]; // MAC
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uint32_t counter:4; // Rolling counter to identify a packet
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uint32_t type:6; // Command, Mqtt, ...
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uint32_t chunks:6; // Number of chunks
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uint32_t chunk:6; // Chunk number
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uint32_t chunkSize:8; // Chunk size
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uint32_t TTL:2; // Time to live, counting down
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union {
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uint32_t senderTime; // UTC-timestamp from every sender in the MESH
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uint32_t peerIndex; // Only for resending in the MESH
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};
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uint8_t tag[16]; // Tag for de/encryption
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uint8_t payload[MESH_PAYLOAD_SIZE];
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} __attribute__((packed));
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struct mesh_packet_header_t { // ToDo: Maybe, we do not need this
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uint8_t sender[6]; // MAC
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uint8_t receiver[6]; // MAC
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uint32_t counter:4; // Rolling counter to identify a packet
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uint32_t type:6; // Command, Mqtt, ...
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uint32_t chunks:6; // Number of chunks
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uint32_t chunk:6; // Chunk number
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uint32_t chunkSize:8; // Chunk size
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uint32_t TTL:2; // Time to live, counting down
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union {
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uint32_t senderTime; // UTC-timestamp from every sender in the MESH
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uint32_t peerIndex; // Only for resending in the MESH
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};
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uint8_t tag[16]; // Tag for de/encryption
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} __attribute__((packed));
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struct mesh_peer_t {
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uint8_t MAC[6];
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uint32_t lastMessageFromPeer; // Time of last message from peer
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#ifdef ESP32
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char topic[MESH_TOPICSZ];
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#endif //ESP32
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};
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struct mesh_flags_t {
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uint8_t brokerNeedsTopic:1;
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uint8_t nodeGotTime:1;
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uint8_t nodeWantsTime:1;
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uint8_t nodeWantsTimeASAP:1;
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};
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struct mesh_packet_combined_t {
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mesh_packet_header_t header;
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uint32_t receivedChunks; // Bitmask for up to 32 chunks
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char raw[MESH_PAYLOAD_SIZE * MESH_BUFFERS];
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};
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struct mesh_first_header_bytes { // TODO: evaluate random 4-byte-value of pre-packet
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uint8_t raw[15];
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} __attribute__((packed));;
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struct {
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uint32_t lastMessageFromBroker; // Time of last message from broker
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uint32_t lmfap; // Yime of last message from any peer
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uint8_t broker[6] = { 0 };
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uint8_t key[32];
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uint8_t role;
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uint8_t channel; // Wifi channel
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uint8_t interval;
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uint8_t currentTopicSize;
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mesh_flags_t flags;
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mesh_packet_t sendPacket;
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std::vector<mesh_peer_t> peers;
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std::queue<mesh_packet_t> packetToResend;
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std::queue<mesh_packet_t> packetToConsume;
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std::vector<mesh_packet_header_t> packetsAlreadySended;
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std::vector<mesh_first_header_bytes> packetsAlreadyReceived;
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std::vector<mesh_packet_combined_t> multiPackets;
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#ifdef ESP32
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std::vector<std::string> lastTeleMsgs;
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#endif //ESP32
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} MESH;
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/*********************************************************************************************\
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* Declarations for functions with custom types
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\*********************************************************************************************/
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void MESHsendPacket(mesh_packet_t *_packet);
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bool MESHencryptPayload(mesh_packet_t *_packet, int _encrypt); // 1 encryption, 0 decryption
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/*********************************************************************************************\
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* enumerations
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\*********************************************************************************************/
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enum MESH_Commands { // commands useable in console or rules
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CMND_MESH_BROKER, // start broker on ESP32
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CMND_MESH_NODE, // start node and connect to broker based on MAC address
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CMND_MESH_PEER, // add node to peer list of a broker or node
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CMND_MESH_CHANNEL}; // set wifi channel on node (the broker gets it automatically from the AP)
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enum MESH_Role {
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ROLE_NONE = 0, // not initialized
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ROLE_BROKER, // ESP32 will connect mesh to WLAN
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ROLE_NODE_FULL, // Node will listen and resend every message for MESH functionality
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ROLE_NODE_SMALL // Node will only talk to the broker
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};
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enum MESH_Packet_Type { // Type of packet
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PACKET_TYPE_TIME = 0, //
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PACKET_TYPE_PEERLIST, // send all kown peers, broker is always 0
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PACKET_TYPE_COMMAND, // not used yet
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PACKET_TYPE_REGISTER_NODE, // register a node with encrypted broker-MAC, announce mqtt topic to ESP32-proxy - broker will send time ASAP
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PACKET_TYPE_REFRESH_NODE, // refresh node infos with encrypted broker-MAC, announce mqtt topic to ESP32-proxy - broker will send time slightly delayed
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PACKET_TYPE_MQTT, // send regular mqtt messages, single or multipackets
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PACKET_TYPE_WANTTOPIC // the broker has no topic for this peer/node
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};
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/*********************************************************************************************\
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*
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\*********************************************************************************************/
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#ifdef ESP32
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void MESHsendTime(void) { // Only from broker to nodes
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MESH.sendPacket.counter++;
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MESH.sendPacket.type = PACKET_TYPE_TIME;
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MESH.sendPacket.TTL = 1;
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// memcpy(MESH.sendPacket.receiver,MESH.peers[_peerNumber].MAC,6);
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MESH.sendPacket.senderTime = Rtc.utc_time;
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MESH.sendPacket.payload[0] = 0;
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// mesh_flags_t *_flags = (mesh_flags_t *)MESH.sendPacket.payload;
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// if(MESH.peers[_peerNumber].topic[0]==0){
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// AddLog(LOG_LEVEL_INFO, PSTR("MSH: Broker wants topic from peer: %u"), _peerNumber);
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// _flags->brokerNeedsTopic = 1;
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// }
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MESH.sendPacket.chunkSize = 0;
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MESH.sendPacket.chunks = 0;
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MESHsendPacket(&MESH.sendPacket);
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}
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void MESHdemandTopic(uint32_t _peerNumber) {
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MESH.sendPacket.counter++;
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MESH.sendPacket.type = PACKET_TYPE_WANTTOPIC;
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MESH.sendPacket.TTL = 2;
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MESH.sendPacket.payload[0] = 0;
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MESH.sendPacket.chunkSize = 0;
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MESH.sendPacket.chunks = 0;
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memcpy(MESH.sendPacket.receiver,MESH.peers[_peerNumber].MAC,6);
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MESHsendPacket(&MESH.sendPacket);
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}
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#endif //ESP32
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void MESHsendPeerList(void) { // We send this list only to the peers, that can directly receive it
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MESH.sendPacket.counter++;
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MESH.sendPacket.type = PACKET_TYPE_PEERLIST;
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MESH.sendPacket.senderTime = Rtc.utc_time;
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uint32_t _idx = 0;
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for (auto &_peer : MESH.peers) {
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memcpy(MESH.sendPacket.payload + _idx, _peer.MAC, 6);
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_idx += 6;
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}
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if (0 == _idx) { return; }
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MESH.sendPacket.chunk = 0;
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MESH.sendPacket.chunks = 1;
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MESH.sendPacket.chunkSize = _idx;
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MESH.sendPacket.TTL = 1;
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// AddLogBuffer(LOG_LEVEL_INFO, MESH.sendPacket.payload, MESH.sendPacket.chunkSize);
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MESHsendPacket(&MESH.sendPacket);
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}
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bool MESHcheckPeerList(const uint8_t *MAC) {
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bool success = false;
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for (auto &_peer : MESH.peers) {
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if (memcmp(_peer.MAC, MAC, 6) == 0) {
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_peer.lastMessageFromPeer = millis();
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return true;
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}
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}
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return false;
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}
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uint8_t MESHcountPeers(void) {
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#ifdef ESP32
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esp_now_peer_num_t _peernum;
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esp_now_get_peer_num(&_peernum);
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uint8_t _num = _peernum.total_num;
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#else
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uint8_t _num;
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uint8_t _numEnc; // wo don't care
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esp_now_get_cnt_info(&_num, &_numEnc);
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#endif
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// AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: Peers %u"), _num);
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return _num;
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}
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int MESHaddPeer(uint8_t *_MAC ) {
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mesh_peer_t _newPeer;
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memcpy(_newPeer.MAC, _MAC, 6);
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_newPeer.lastMessageFromPeer = millis();
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#ifdef ESP32
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_newPeer.topic[0] = 0;
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#endif
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MESH.peers.push_back(_newPeer);
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#ifdef ESP32
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std::string _msg = "{\"Init\":1}"; // Init with a simple JSON only while developing
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MESH.lastTeleMsgs.push_back(_msg); // We must keep this vector in sync with the peers-struct on the broker regarding the indices
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#endif //ESP32
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int err;
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#ifdef ESP32
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esp_now_peer_info_t _peer;
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_peer.channel = MESH.channel;
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_peer.encrypt = false;
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_peer.ifidx = (wifi_interface_t)ESP_IF_WIFI_AP;
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memcpy(_peer.peer_addr, _MAC, 6);
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err = esp_now_add_peer(&_peer);
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#else
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err = esp_now_add_peer(_MAC, ESP_NOW_ROLE_COMBO, MESH.channel, NULL, 0);
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#endif
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if (0 == err) {
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char _peerMAC[18];
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ToHex_P(_MAC, 6, _peerMAC, 18, ':');
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AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: Peer %s added successful"), _peerMAC);
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#ifdef ESP32
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if (ROLE_BROKER == MESH.role) { MESHsendTime(); }
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#endif //ESP32
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Response_P(PSTR("{\"%s\":{\"Peers\":%u}}"), D_CMND_MESH, MESH.peers.size());
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XdrvRulesProcess(0);
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return err;
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} else {
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AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: Failed to add peer %d"), err);
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}
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return err;
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}
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//helper functions
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void MESHstripColon(char* _string) {
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uint32_t _length = strlen(_string);
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uint32_t _index = 0;
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while (_index < _length) {
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char c = _string[_index];
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if (c == ':') {
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memmove(_string + _index, _string + _index +1, _length - _index);
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}
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_index++;
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}
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_string[_index] = 0;
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}
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void MESHHexStringToBytes(char* _string, uint8_t _MAC[]) { //uppercase
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MESHstripColon(_string);
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UpperCase(_string, _string);
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uint32_t index = 0;
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uint32_t _end = strlen(_string);
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memset(_MAC, 0, _end / 2);
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while (index < _end) {
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char c = _string[index];
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uint8_t value = 0;
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if ((c >= '0') && (c <= '9')) {
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value = (c - '0');
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}
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else if ((c >= 'A') && (c <= 'F')) {
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value = (10 + (c - 'A'));
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}
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_MAC[(index / 2)] += value << (((index + 1) % 2) * 4);
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index++;
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}
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}
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void MESHsendPacket(mesh_packet_t *_packet) {
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MESHencryptPayload(_packet, 1);
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// esp_now_send(_packet->receiver, (uint8_t *)_packet, sizeof(MESH.sendPacket) - MESH_PAYLOAD_SIZE + _packet->chunkSize);
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esp_now_send(NULL, (uint8_t *)_packet, sizeof(MESH.sendPacket) - MESH_PAYLOAD_SIZE + _packet->chunkSize); //NULL -> broadcast
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}
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void MESHsetKey(uint8_t* _key) { // Must be 32 bytes!!!
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char* _pw = SettingsText(SET_STAPWD1 + Settings->sta_active);
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size_t _length = strlen(_pw);
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memset(_key, 0, 32);
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if (_length > 32) { _length = 32; }
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memcpy(_key, _pw, _length);
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AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: set crypto key to PASSWORD1"));
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}
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bool MESHencryptPayload(mesh_packet_t *_packet, int _encrypt) {
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// AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: will encrypt: %u"), _encrypt);
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size_t _size = _packet->chunkSize;
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char _tag[16];
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// AddLog(LOG_LEVEL_DEBUG, PSTR("cc: %u, _size: %u"), _counter,_size);
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// AddLogBuffer(LOG_LEVEL_DEBUG,(uint8_t*)_tag,16);
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br_chacha20_run bc = br_chacha20_ct_run;
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br_poly1305_ctmul32_run((void*)MESH.key, (const void *)_packet,
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(void *)_packet->payload, _size, _packet->receiver+6, 2,
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_tag, bc, _encrypt);
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// AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: encryption done "));
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if (_encrypt==1) {
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memcpy(_packet->tag, _tag, 16);
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// AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: payload encrypted"));
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return true;
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}
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if (memcmp(_packet->tag, _tag, 16) == 0) {
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// AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: payload decrypted"));
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return true;
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}
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AddLog(LOG_LEVEL_DEBUG, PSTR("MSH: payload decryption error"));
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return false;
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}
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void MESHsetSleep(void) {
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if (MESH.role && (Settings->sleep > MESH.interval)) {
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Settings->sleep = MESH.interval;
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TasmotaGlobal.sleep = MESH.interval;
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}
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}
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void MESHsetWifi(bool state) {
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#ifdef ESP8266 // Only ESP8266 as ESP32 is a broker and needs Wifi
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if (state) { // Wifi On
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Settings->flag4.network_wifi = 1; // (Re-)enable wifi as long as Mesh is not enabled
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// TasmotaGlobal.global_state.wifi_down = 0;
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Settings->flag.global_state = 0; // (Wifi, MQTT) Control link led blinking (1)
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} else { // Wifi Off and use ESP-NOW
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Settings->flag4.network_wifi = 0; // The "old" wifi off command
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TasmotaGlobal.global_state.wifi_down = 1;
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Settings->flag.global_state = 1; // (Wifi, MQTT) Control link led blinking (1)
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}
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#endif // ESP8266
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}
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uint32_t MESHmaxPayloadSize(void) {
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return MESH_PAYLOAD_SIZE - MESH.currentTopicSize -1;
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}
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#endif //USE_TASMESH
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