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MeshCore/examples/simple_room_server/MyMesh.cpp

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#include "MyMesh.h"
#define REPLY_DELAY_MILLIS 1500
#define PUSH_NOTIFY_DELAY_MILLIS 2000
#define SYNC_PUSH_INTERVAL 1200
#define PUSH_ACK_TIMEOUT_FLOOD 12000
#define PUSH_TIMEOUT_BASE 4000
#define PUSH_ACK_TIMEOUT_FACTOR 2000
#define POST_SYNC_DELAY_SECS 6
#define FIRMWARE_VER_LEVEL 1
#define REQ_TYPE_GET_STATUS 0x01 // same as _GET_STATS
#define REQ_TYPE_KEEP_ALIVE 0x02
#define REQ_TYPE_GET_TELEMETRY_DATA 0x03
#define REQ_TYPE_GET_ACCESS_LIST 0x05
#define RESP_SERVER_LOGIN_OK 0 // response to ANON_REQ
#define LAZY_CONTACTS_WRITE_DELAY 5000
struct ServerStats {
uint16_t batt_milli_volts;
uint16_t curr_tx_queue_len;
int16_t noise_floor;
int16_t last_rssi;
uint32_t n_packets_recv;
uint32_t n_packets_sent;
uint32_t total_air_time_secs;
uint32_t total_up_time_secs;
uint32_t n_sent_flood, n_sent_direct;
uint32_t n_recv_flood, n_recv_direct;
uint16_t err_events; // was 'n_full_events'
int16_t last_snr; // x 4
uint16_t n_direct_dups, n_flood_dups;
uint16_t n_posted, n_post_push;
};
void MyMesh::addPost(ClientInfo *client, const char *postData) {
// TODO: suggested postData format: <title>/<descrption>
posts[next_post_idx].author = client->id; // add to cyclic queue
StrHelper::strncpy(posts[next_post_idx].text, postData, MAX_POST_TEXT_LEN);
posts[next_post_idx].post_timestamp = getRTCClock()->getCurrentTimeUnique();
next_post_idx = (next_post_idx + 1) % MAX_UNSYNCED_POSTS;
next_push = futureMillis(PUSH_NOTIFY_DELAY_MILLIS);
_num_posted++; // stats
}
void MyMesh::pushPostToClient(ClientInfo *client, PostInfo &post) {
int len = 0;
memcpy(&reply_data[len], &post.post_timestamp, 4);
len += 4; // this is a PAST timestamp... but should be accepted by client
uint8_t attempt;
getRNG()->random(&attempt, 1); // need this for re-tries, so packet hash (and ACK) will be different
reply_data[len++] = (TXT_TYPE_SIGNED_PLAIN << 2) | (attempt & 3); // 'signed' plain text
// encode prefix of post.author.pub_key
memcpy(&reply_data[len], post.author.pub_key, 4);
len += 4; // just first 4 bytes
int text_len = strlen(post.text);
memcpy(&reply_data[len], post.text, text_len);
len += text_len;
// calc expected ACK reply
mesh::Utils::sha256((uint8_t *)&client->extra.room.pending_ack, 4, reply_data, len, client->id.pub_key, PUB_KEY_SIZE);
client->extra.room.push_post_timestamp = post.post_timestamp;
auto reply = createDatagram(PAYLOAD_TYPE_TXT_MSG, client->id, client->shared_secret, reply_data, len);
if (reply) {
if (client->out_path_len == OUT_PATH_UNKNOWN) {
unsigned long delay_millis = 0;
sendFlood(reply, delay_millis, _prefs.path_hash_mode + 1);
client->extra.room.ack_timeout = futureMillis(PUSH_ACK_TIMEOUT_FLOOD);
} else {
sendDirect(reply, client->out_path, client->out_path_len);
uint8_t path_hash_count = client->out_path_len & 63;
client->extra.room.ack_timeout = futureMillis(PUSH_TIMEOUT_BASE + PUSH_ACK_TIMEOUT_FACTOR * (path_hash_count + 1));
}
_num_post_pushes++; // stats
} else {
client->extra.room.pending_ack = 0;
MESH_DEBUG_PRINTLN("Unable to push post to client");
}
}
uint8_t MyMesh::getUnsyncedCount(ClientInfo *client) {
uint8_t count = 0;
for (int k = 0; k < MAX_UNSYNCED_POSTS; k++) {
if (posts[k].post_timestamp > client->extra.room.sync_since // is new post for this Client?
&& !posts[k].author.matches(client->id)) { // don't push posts to the author
count++;
}
}
return count;
}
bool MyMesh::processAck(const uint8_t *data) {
for (int i = 0; i < acl.getNumClients(); i++) {
auto client = acl.getClientByIdx(i);
if (client->extra.room.pending_ack && memcmp(data, &client->extra.room.pending_ack, 4) == 0) { // got an ACK from Client!
client->extra.room.pending_ack = 0; // clear this, so next push can happen
client->extra.room.push_failures = 0;
client->extra.room.sync_since = client->extra.room.push_post_timestamp; // advance Client's SINCE timestamp, to sync next post
return true;
}
}
return false;
}
mesh::Packet *MyMesh::createSelfAdvert() {
uint8_t app_data[MAX_ADVERT_DATA_SIZE];
uint8_t app_data_len = _cli.buildAdvertData(ADV_TYPE_ROOM, app_data);
return createAdvert(self_id, app_data, app_data_len);
}
File MyMesh::openAppend(const char *fname) {
#if defined(NRF52_PLATFORM)
return _fs->open(fname, FILE_O_WRITE);
#elif defined(RP2040_PLATFORM)
return _fs->open(fname, "a");
#else
return _fs->open(fname, "a", true);
#endif
}
int MyMesh::handleRequest(ClientInfo *sender, uint32_t sender_timestamp, uint8_t *payload,
size_t payload_len) {
// uint32_t now = getRTCClock()->getCurrentTimeUnique();
// memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
memcpy(reply_data, &sender_timestamp, 4); // reflect sender_timestamp back in response packet (kind of like a 'tag')
if (payload[0] == REQ_TYPE_GET_STATUS) {
ServerStats stats;
stats.batt_milli_volts = board.getBattMilliVolts();
stats.curr_tx_queue_len = _mgr->getOutboundTotal();
stats.noise_floor = (int16_t)_radio->getNoiseFloor();
stats.last_rssi = (int16_t)radio_driver.getLastRSSI();
stats.n_packets_recv = radio_driver.getPacketsRecv();
stats.n_packets_sent = radio_driver.getPacketsSent();
stats.total_air_time_secs = getTotalAirTime() / 1000;
stats.total_up_time_secs = uptime_millis / 1000;
stats.n_sent_flood = getNumSentFlood();
stats.n_sent_direct = getNumSentDirect();
stats.n_recv_flood = getNumRecvFlood();
stats.n_recv_direct = getNumRecvDirect();
stats.err_events = _err_flags;
stats.last_snr = (int16_t)(radio_driver.getLastSNR() * 4);
stats.n_direct_dups = ((SimpleMeshTables *)getTables())->getNumDirectDups();
stats.n_flood_dups = ((SimpleMeshTables *)getTables())->getNumFloodDups();
stats.n_posted = _num_posted;
stats.n_post_push = _num_post_pushes;
memcpy(&reply_data[4], &stats, sizeof(stats));
return 4 + sizeof(stats);
}
if (payload[0] == REQ_TYPE_GET_TELEMETRY_DATA) {
uint8_t perm_mask = ~(payload[1]); // NEW: first reserved byte (of 4), is now inverse mask to apply to permissions
telemetry.reset();
telemetry.addVoltage(TELEM_CHANNEL_SELF, (float)board.getBattMilliVolts() / 1000.0f);
// query other sensors -- target specific
if ((sender->permissions & PERM_ACL_ROLE_MASK) == PERM_ACL_GUEST) {
perm_mask = 0x00; // just base telemetry allowed
}
sensors.querySensors(perm_mask, telemetry);
// This default temperature will be overridden by external sensors (if any)
float temperature = board.getMCUTemperature();
if(!isnan(temperature)) { // Supported boards with built-in temperature sensor. ESP32-C3 may return NAN
telemetry.addTemperature(TELEM_CHANNEL_SELF, temperature); // Built-in MCU Temperature
}
uint8_t tlen = telemetry.getSize();
memcpy(&reply_data[4], telemetry.getBuffer(), tlen);
return 4 + tlen; // reply_len
}
if (payload[0] == REQ_TYPE_GET_ACCESS_LIST && sender->isAdmin()) {
uint8_t res1 = payload[1]; // reserved for future (extra query params)
uint8_t res2 = payload[2];
if (res1 == 0 && res2 == 0) {
uint8_t ofs = 4;
for (int i = 0; i < acl.getNumClients() && ofs + 7 <= sizeof(reply_data) - 4; i++) {
auto c = acl.getClientByIdx(i);
if (!c->isAdmin()) continue; // skip non-Admin entries
memcpy(&reply_data[ofs], c->id.pub_key, 6); ofs += 6; // just 6-byte pub_key prefix
reply_data[ofs++] = c->permissions;
}
return ofs;
}
}
return 0; // unknown command
}
void MyMesh::logRxRaw(float snr, float rssi, const uint8_t raw[], int len) {
#if MESH_PACKET_LOGGING
Serial.print(getLogDateTime());
Serial.print(" RAW: ");
mesh::Utils::printHex(Serial, raw, len);
Serial.println();
#endif
}
void MyMesh::logRx(mesh::Packet *pkt, int len, float score) {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": RX, len=%d (type=%d, route=%s, payload_len=%d) SNR=%d RSSI=%d score=%d", len,
pkt->getPayloadType(), pkt->isRouteDirect() ? "D" : "F", pkt->payload_len,
(int)_radio->getLastSNR(), (int)_radio->getLastRSSI(), (int)(score * 1000));
if (pkt->getPayloadType() == PAYLOAD_TYPE_PATH || pkt->getPayloadType() == PAYLOAD_TYPE_REQ ||
pkt->getPayloadType() == PAYLOAD_TYPE_RESPONSE || pkt->getPayloadType() == PAYLOAD_TYPE_TXT_MSG) {
f.printf(" [%02X -> %02X]\n", (uint32_t)pkt->payload[1], (uint32_t)pkt->payload[0]);
} else {
f.printf("\n");
}
f.close();
}
}
}
void MyMesh::logTx(mesh::Packet *pkt, int len) {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": TX, len=%d (type=%d, route=%s, payload_len=%d)", len, pkt->getPayloadType(),
pkt->isRouteDirect() ? "D" : "F", pkt->payload_len);
if (pkt->getPayloadType() == PAYLOAD_TYPE_PATH || pkt->getPayloadType() == PAYLOAD_TYPE_REQ ||
pkt->getPayloadType() == PAYLOAD_TYPE_RESPONSE || pkt->getPayloadType() == PAYLOAD_TYPE_TXT_MSG) {
f.printf(" [%02X -> %02X]\n", (uint32_t)pkt->payload[1], (uint32_t)pkt->payload[0]);
} else {
f.printf("\n");
}
f.close();
}
}
}
void MyMesh::logTxFail(mesh::Packet *pkt, int len) {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": TX FAIL!, len=%d (type=%d, route=%s, payload_len=%d)\n", len, pkt->getPayloadType(),
pkt->isRouteDirect() ? "D" : "F", pkt->payload_len);
f.close();
}
}
}
int MyMesh::calcRxDelay(float score, uint32_t air_time) const {
if (_prefs.rx_delay_base <= 0.0f) return 0;
return (int)((pow(_prefs.rx_delay_base, 0.85f - score) - 1.0) * air_time);
}
const char *MyMesh::getLogDateTime() {
static char tmp[32];
uint32_t now = getRTCClock()->getCurrentTime();
DateTime dt = DateTime(now);
sprintf(tmp, "%02d:%02d:%02d - %d/%d/%d U", dt.hour(), dt.minute(), dt.second(), dt.day(), dt.month(),
dt.year());
return tmp;
}
uint32_t MyMesh::getRetransmitDelay(const mesh::Packet *packet) {
uint32_t t = (_radio->getEstAirtimeFor(packet->getPathByteLen() + packet->payload_len + 2) * _prefs.tx_delay_factor);
return getRNG()->nextInt(0, 5*t + 1);
}
uint32_t MyMesh::getDirectRetransmitDelay(const mesh::Packet *packet) {
uint32_t t = (_radio->getEstAirtimeFor(packet->getPathByteLen() + packet->payload_len + 2) * _prefs.direct_tx_delay_factor);
return getRNG()->nextInt(0, 5*t + 1);
}
bool MyMesh::allowPacketForward(const mesh::Packet *packet) {
if (_prefs.disable_fwd) return false;
if (packet->isRouteFlood() && packet->getPathHashCount() >= _prefs.flood_max) return false;
return true;
}
void MyMesh::onAnonDataRecv(mesh::Packet *packet, const uint8_t *secret, const mesh::Identity &sender,
uint8_t *data, size_t len) {
if (packet->getPayloadType() == PAYLOAD_TYPE_ANON_REQ) { // received an initial request by a possible admin
// client (unknown at this stage)
uint32_t sender_timestamp, sender_sync_since;
memcpy(&sender_timestamp, data, 4);
memcpy(&sender_sync_since, &data[4], 4); // sender's "sync messags SINCE x" timestamp
data[len] = 0; // ensure null terminator
ClientInfo* client = NULL;
if (data[8] == 0) { // blank password, just check if sender is in ACL
client = acl.getClient(sender.pub_key, PUB_KEY_SIZE);
if (client == NULL) {
#if MESH_DEBUG
MESH_DEBUG_PRINTLN("Login, sender not in ACL");
#endif
}
}
if (client == NULL) {
uint8_t perm;
if (strcmp((char *)&data[8], _prefs.password) == 0) { // check for valid admin password
perm = PERM_ACL_ADMIN;
} else {
if (strcmp((char *)&data[8], _prefs.guest_password) == 0) { // check the room/public password
perm = PERM_ACL_READ_WRITE;
} else if (_prefs.allow_read_only) {
perm = PERM_ACL_GUEST;
} else {
MESH_DEBUG_PRINTLN("Incorrect room password");
return; // no response. Client will timeout
}
}
client = acl.putClient(sender, 0); // add to known clients (if not already known)
if (sender_timestamp <= client->last_timestamp) {
MESH_DEBUG_PRINTLN("possible replay attack!");
return;
}
MESH_DEBUG_PRINTLN("Login success!");
client->last_timestamp = sender_timestamp;
client->extra.room.sync_since = sender_sync_since;
client->extra.room.pending_ack = 0;
client->extra.room.push_failures = 0;
client->last_activity = getRTCClock()->getCurrentTime();
client->permissions &= ~0x03;
client->permissions |= perm;
memcpy(client->shared_secret, secret, PUB_KEY_SIZE);
dirty_contacts_expiry = futureMillis(LAZY_CONTACTS_WRITE_DELAY);
}
if (packet->isRouteFlood()) {
client->out_path_len = OUT_PATH_UNKNOWN; // need to rediscover out_path
}
uint32_t now = getRTCClock()->getCurrentTimeUnique();
memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
// TODO: maybe reply with count of messages waiting to be synced for THIS client?
reply_data[4] = RESP_SERVER_LOGIN_OK;
reply_data[5] = 0; // Legacy: was recommended keep-alive interval (secs / 16)
reply_data[6] = (client->isAdmin() ? 1 : (client->permissions == 0 ? 2 : 0));
// LEGACY: reply_data[7] = getUnsyncedCount(client);
reply_data[7] = client->permissions; // NEW
getRNG()->random(&reply_data[8], 4); // random blob to help packet-hash uniqueness
reply_data[12] = FIRMWARE_VER_LEVEL; // New field
next_push = futureMillis(PUSH_NOTIFY_DELAY_MILLIS); // delay next push, give RESPONSE packet time to arrive first
if (packet->isRouteFlood()) {
// let this sender know path TO here, so they can use sendDirect(), and ALSO encode the response
mesh::Packet *path = createPathReturn(sender, client->shared_secret, packet->path, packet->path_len,
PAYLOAD_TYPE_RESPONSE, reply_data, 13);
if (path) sendFlood(path, SERVER_RESPONSE_DELAY, packet->getPathHashSize());
} else {
mesh::Packet *reply = createDatagram(PAYLOAD_TYPE_RESPONSE, sender, client->shared_secret, reply_data, 13);
if (reply) {
if (client->out_path_len != OUT_PATH_UNKNOWN) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
} else {
sendFlood(reply, SERVER_RESPONSE_DELAY, packet->getPathHashSize());
}
}
}
}
}
int MyMesh::searchPeersByHash(const uint8_t *hash) {
int n = 0;
for (int i = 0; i < acl.getNumClients(); i++) {
if (acl.getClientByIdx(i)->id.isHashMatch(hash)) {
matching_peer_indexes[n++] = i; // store the INDEXES of matching contacts (for subsequent 'peer' methods)
}
}
return n;
}
void MyMesh::getPeerSharedSecret(uint8_t *dest_secret, int peer_idx) {
int i = matching_peer_indexes[peer_idx];
if (i >= 0 && i < acl.getNumClients()) {
// lookup pre-calculated shared_secret
memcpy(dest_secret, acl.getClientByIdx(i)->shared_secret, PUB_KEY_SIZE);
} else {
MESH_DEBUG_PRINTLN("getPeerSharedSecret: Invalid peer idx: %d", i);
}
}
void MyMesh::onPeerDataRecv(mesh::Packet *packet, uint8_t type, int sender_idx, const uint8_t *secret,
uint8_t *data, size_t len) {
int i = matching_peer_indexes[sender_idx];
if (i < 0 || i >= acl.getNumClients()) { // get from our known_clients table (sender SHOULD already be known in this context)
MESH_DEBUG_PRINTLN("onPeerDataRecv: invalid peer idx: %d", i);
return;
}
auto client = acl.getClientByIdx(i);
if (type == PAYLOAD_TYPE_TXT_MSG && len > 5) { // a CLI command or new Post
uint32_t sender_timestamp;
memcpy(&sender_timestamp, data, 4); // timestamp (by sender's RTC clock - which could be wrong)
uint8_t flags = (data[4] >> 2); // message attempt number, and other flags
if (!(flags == TXT_TYPE_PLAIN || flags == TXT_TYPE_CLI_DATA)) {
MESH_DEBUG_PRINTLN("onPeerDataRecv: unsupported command flags received: flags=%02x", (uint32_t)flags);
} else if (sender_timestamp >= client->last_timestamp) { // prevent replay attacks, but send Acks for retries
bool is_retry = (sender_timestamp == client->last_timestamp);
client->last_timestamp = sender_timestamp;
uint32_t now = getRTCClock()->getCurrentTimeUnique();
client->last_activity = now;
client->extra.room.push_failures = 0; // reset so push can resume (if prev failed)
// len can be > original length, but 'text' will be padded with zeroes
data[len] = 0; // need to make a C string again, with null terminator
uint32_t ack_hash; // calc truncated hash of the message timestamp + text + sender pub_key, to prove to
// sender that we got it
mesh::Utils::sha256((uint8_t *)&ack_hash, 4, data, 5 + strlen((char *)&data[5]), client->id.pub_key,
PUB_KEY_SIZE);
uint8_t temp[166];
bool send_ack;
if (flags == TXT_TYPE_CLI_DATA) {
if (client->isAdmin()) {
if (is_retry) {
temp[5] = 0; // no reply
} else {
handleCommand(sender_timestamp, (char *)&data[5], (char *)&temp[5]);
temp[4] = (TXT_TYPE_CLI_DATA << 2); // attempt and flags, (NOTE: legacy was: TXT_TYPE_PLAIN)
}
send_ack = false;
} else {
temp[5] = 0; // no reply
send_ack = false; // and no ACK... user shoudn't be sending these
}
} else { // TXT_TYPE_PLAIN
if ((client->permissions & PERM_ACL_ROLE_MASK) == PERM_ACL_GUEST) {
temp[5] = 0; // no reply
send_ack = false; // no ACK
} else {
if (!is_retry) {
addPost(client, (const char *)&data[5]);
}
temp[5] = 0; // no reply (ACK is enough)
send_ack = true;
}
}
uint32_t delay_millis;
if (send_ack) {
if (client->out_path_len == OUT_PATH_UNKNOWN) {
mesh::Packet *ack = createAck(ack_hash);
if (ack) sendFlood(ack, TXT_ACK_DELAY, packet->getPathHashSize());
delay_millis = TXT_ACK_DELAY + REPLY_DELAY_MILLIS;
} else {
uint32_t d = TXT_ACK_DELAY;
if (getExtraAckTransmitCount() > 0) {
mesh::Packet *a1 = createMultiAck(ack_hash, 1);
if (a1) sendDirect(a1, client->out_path, client->out_path_len, d);
d += 300;
}
mesh::Packet *a2 = createAck(ack_hash);
if (a2) sendDirect(a2, client->out_path, client->out_path_len, d);
delay_millis = d + REPLY_DELAY_MILLIS;
}
} else {
delay_millis = 0;
}
int text_len = strlen((char *)&temp[5]);
if (text_len > 0) {
if (now == sender_timestamp) {
// WORKAROUND: the two timestamps need to be different, in the CLI view
now++;
}
memcpy(temp, &now, 4); // mostly an extra blob to help make packet_hash unique
// calc expected ACK reply
// mesh::Utils::sha256((uint8_t *)&expected_ack_crc, 4, temp, 5 + text_len, self_id.pub_key,
// PUB_KEY_SIZE);
auto reply = createDatagram(PAYLOAD_TYPE_TXT_MSG, client->id, secret, temp, 5 + text_len);
if (reply) {
if (client->out_path_len == OUT_PATH_UNKNOWN) {
sendFlood(reply, delay_millis + SERVER_RESPONSE_DELAY, packet->getPathHashSize());
} else {
sendDirect(reply, client->out_path, client->out_path_len, delay_millis + SERVER_RESPONSE_DELAY);
}
}
}
} else {
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
}
} else if (type == PAYLOAD_TYPE_REQ && len >= 5) {
uint32_t sender_timestamp;
memcpy(&sender_timestamp, data, 4); // timestamp (by sender's RTC clock - which could be wrong)
if (sender_timestamp < client->last_timestamp) { // prevent replay attacks
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
} else {
client->last_timestamp = sender_timestamp;
uint32_t now = getRTCClock()->getCurrentTime();
client->last_activity = now; // <-- THIS will keep client connection alive
client->extra.room.push_failures = 0; // reset so push can resume (if prev failed)
if (data[4] == REQ_TYPE_KEEP_ALIVE && packet->isRouteDirect()) { // request type
uint32_t forceSince = 0;
if (len >= 9) { // optional - last post_timestamp client received
memcpy(&forceSince, &data[5], 4); // NOTE: this may be 0, if part of decrypted PADDING!
} else {
memcpy(&data[5], &forceSince, 4); // make sure there are zeroes in payload (for ack_hash calc below)
}
if (forceSince > 0) {
client->extra.room.sync_since = forceSince; // force-update the 'sync since'
}
client->extra.room.pending_ack = 0;
// TODO: Throttle KEEP_ALIVE requests!
// if client sends too quickly, evict()
// RULE: only send keep_alive response DIRECT!
if (client->out_path_len != OUT_PATH_UNKNOWN) {
uint32_t ack_hash; // calc ACK to prove to sender that we got request
mesh::Utils::sha256((uint8_t *)&ack_hash, 4, data, 9, client->id.pub_key, PUB_KEY_SIZE);
auto reply = createAck(ack_hash);
if (reply) {
reply->payload[reply->payload_len++] = getUnsyncedCount(client); // NEW: add unsynced counter to end of ACK packet
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
}
}
} else {
int reply_len = handleRequest(client, sender_timestamp, &data[4], len - 4);
if (reply_len > 0) { // valid command
if (packet->isRouteFlood()) {
// let this sender know path TO here, so they can use sendDirect(), and ALSO encode the response
mesh::Packet *path = createPathReturn(client->id, secret, packet->path, packet->path_len,
PAYLOAD_TYPE_RESPONSE, reply_data, reply_len);
if (path) sendFlood(path, SERVER_RESPONSE_DELAY, packet->getPathHashSize());
} else {
mesh::Packet *reply = createDatagram(PAYLOAD_TYPE_RESPONSE, client->id, secret, reply_data, reply_len);
if (reply) {
if (client->out_path_len != OUT_PATH_UNKNOWN) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
} else {
sendFlood(reply, SERVER_RESPONSE_DELAY, packet->getPathHashSize());
}
}
}
}
}
}
}
}
bool MyMesh::onPeerPathRecv(mesh::Packet *packet, int sender_idx, const uint8_t *secret, uint8_t *path,
uint8_t path_len, uint8_t extra_type, uint8_t *extra, uint8_t extra_len) {
// TODO: prevent replay attacks
int i = matching_peer_indexes[sender_idx];
if (i >= 0 && i < acl.getNumClients()) { // get from our known_clients table (sender SHOULD already be known in this context)
MESH_DEBUG_PRINTLN("PATH to client, path_len=%d", (uint32_t)path_len);
auto client = acl.getClientByIdx(i);
client->out_path_len = mesh::Packet::copyPath(client->out_path, path, path_len); // store a copy of path, for sendDirect()
client->last_activity = getRTCClock()->getCurrentTime();
} else {
MESH_DEBUG_PRINTLN("onPeerPathRecv: invalid peer idx: %d", i);
}
if (extra_type == PAYLOAD_TYPE_ACK && extra_len >= 4) {
// also got an encoded ACK!
processAck(extra);
}
// NOTE: no reciprocal path send!!
return false;
}
void MyMesh::onAckRecv(mesh::Packet *packet, uint32_t ack_crc) {
if (processAck((uint8_t *)&ack_crc)) {
packet->markDoNotRetransmit(); // ACK was for this node, so don't retransmit
}
}
MyMesh::MyMesh(mesh::MainBoard &board, mesh::Radio &radio, mesh::MillisecondClock &ms, mesh::RNG &rng,
mesh::RTCClock &rtc, mesh::MeshTables &tables)
: mesh::Mesh(radio, ms, rng, rtc, *new StaticPoolPacketManager(32), tables),
_cli(board, rtc, sensors, acl, &_prefs, this), telemetry(MAX_PACKET_PAYLOAD - 4) {
last_millis = 0;
uptime_millis = 0;
next_local_advert = next_flood_advert = 0;
dirty_contacts_expiry = 0;
_logging = false;
set_radio_at = revert_radio_at = 0;
// defaults
memset(&_prefs, 0, sizeof(_prefs));
_prefs.airtime_factor = 1.0;
_prefs.rx_delay_base = 0.0f; // off by default, was 10.0
_prefs.tx_delay_factor = 0.5f; // was 0.25f;
_prefs.direct_tx_delay_factor = 0.2f; // was zero
StrHelper::strncpy(_prefs.node_name, ADVERT_NAME, sizeof(_prefs.node_name));
_prefs.node_lat = ADVERT_LAT;
_prefs.node_lon = ADVERT_LON;
StrHelper::strncpy(_prefs.password, ADMIN_PASSWORD, sizeof(_prefs.password));
_prefs.freq = LORA_FREQ;
_prefs.sf = LORA_SF;
_prefs.bw = LORA_BW;
_prefs.cr = LORA_CR;
_prefs.tx_power_dbm = LORA_TX_POWER;
_prefs.disable_fwd = 1;
_prefs.advert_interval = 1; // default to 2 minutes for NEW installs
_prefs.flood_advert_interval = 12; // 12 hours
_prefs.flood_max = 64;
_prefs.interference_threshold = 0; // disabled
#ifdef ROOM_PASSWORD
StrHelper::strncpy(_prefs.guest_password, ROOM_PASSWORD, sizeof(_prefs.guest_password));
#endif
// GPS defaults
_prefs.gps_enabled = 0;
_prefs.gps_interval = 0;
_prefs.advert_loc_policy = ADVERT_LOC_PREFS;
next_post_idx = 0;
next_client_idx = 0;
next_push = 0;
memset(posts, 0, sizeof(posts));
_num_posted = _num_post_pushes = 0;
}
void MyMesh::begin(FILESYSTEM *fs) {
mesh::Mesh::begin();
_fs = fs;
// load persisted prefs
_cli.loadPrefs(_fs);
acl.load(_fs, self_id);
radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
radio_set_tx_power(_prefs.tx_power_dbm);
updateAdvertTimer();
updateFloodAdvertTimer();
board.setAdcMultiplier(_prefs.adc_multiplier);
#if ENV_INCLUDE_GPS == 1
applyGpsPrefs();
#endif
}
void MyMesh::applyTempRadioParams(float freq, float bw, uint8_t sf, uint8_t cr, int timeout_mins) {
set_radio_at = futureMillis(2000); // give CLI reply some time to be sent back, before applying temp radio params
pending_freq = freq;
pending_bw = bw;
pending_sf = sf;
pending_cr = cr;
revert_radio_at = futureMillis(2000 + timeout_mins * 60 * 1000); // schedule when to revert radio params
}
bool MyMesh::formatFileSystem() {
#if defined(NRF52_PLATFORM)
return InternalFS.format();
#elif defined(RP2040_PLATFORM)
return LittleFS.format();
#elif defined(ESP32)
return SPIFFS.format();
#else
#error "need to implement file system erase"
return false;
#endif
}
void MyMesh::sendSelfAdvertisement(int delay_millis, bool flood) {
mesh::Packet *pkt = createSelfAdvert();
if (pkt) {
if (flood) {
sendFlood(pkt, delay_millis, _prefs.path_hash_mode + 1);
} else {
sendZeroHop(pkt, delay_millis);
}
} else {
MESH_DEBUG_PRINTLN("ERROR: unable to create advertisement packet!");
}
}
void MyMesh::updateAdvertTimer() {
if (_prefs.advert_interval > 0) { // schedule local advert timer
next_local_advert = futureMillis((uint32_t)_prefs.advert_interval * 2 * 60 * 1000);
} else {
next_local_advert = 0; // stop the timer
}
}
void MyMesh::updateFloodAdvertTimer() {
if (_prefs.flood_advert_interval > 0) { // schedule flood advert timer
next_flood_advert = futureMillis(((uint32_t)_prefs.flood_advert_interval) * 60 * 60 * 1000);
} else {
next_flood_advert = 0; // stop the timer
}
}
void MyMesh::dumpLogFile() {
#if defined(RP2040_PLATFORM)
File f = _fs->open(PACKET_LOG_FILE, "r");
#else
File f = _fs->open(PACKET_LOG_FILE);
#endif
if (f) {
while (f.available()) {
int c = f.read();
if (c < 0) break;
Serial.print((char)c);
}
f.close();
}
}
void MyMesh::setTxPower(int8_t power_dbm) {
radio_set_tx_power(power_dbm);
}
void MyMesh::saveIdentity(const mesh::LocalIdentity &new_id) {
#if defined(NRF52_PLATFORM) || defined(STM32_PLATFORM)
IdentityStore store(*_fs, "");
#elif defined(ESP32)
IdentityStore store(*_fs, "/identity");
#elif defined(RP2040_PLATFORM)
IdentityStore store(*_fs, "/identity");
#else
#error "need to define saveIdentity()"
#endif
store.save("_main", new_id);
}
void MyMesh::clearStats() {
radio_driver.resetStats();
resetStats();
((SimpleMeshTables *)getTables())->resetStats();
}
void MyMesh::formatStatsReply(char *reply) {
StatsFormatHelper::formatCoreStats(reply, board, *_ms, _err_flags, _mgr);
}
void MyMesh::formatRadioStatsReply(char *reply) {
StatsFormatHelper::formatRadioStats(reply, _radio, radio_driver, getTotalAirTime(), getReceiveAirTime());
}
void MyMesh::formatPacketStatsReply(char *reply) {
StatsFormatHelper::formatPacketStats(reply, radio_driver, getNumSentFlood(), getNumSentDirect(),
getNumRecvFlood(), getNumRecvDirect());
}
void MyMesh::handleCommand(uint32_t sender_timestamp, char *command, char *reply) {
while (*command == ' ')
command++; // skip leading spaces
if (strlen(command) > 4 && command[2] == '|') { // optional prefix (for companion radio CLI)
memcpy(reply, command, 3); // reflect the prefix back
reply += 3;
command += 3;
}
// handle ACL related commands
if (memcmp(command, "setperm ", 8) == 0) { // format: setperm {pubkey-hex} {permissions-int8}
char* hex = &command[8];
char* sp = strchr(hex, ' '); // look for separator char
if (sp == NULL) {
strcpy(reply, "Err - bad params");
} else {
*sp++ = 0; // replace space with null terminator
uint8_t pubkey[PUB_KEY_SIZE];
int hex_len = min(sp - hex, PUB_KEY_SIZE*2);
if (mesh::Utils::fromHex(pubkey, hex_len / 2, hex)) {
uint8_t perms = atoi(sp);
if (acl.applyPermissions(self_id, pubkey, hex_len / 2, perms)) {
dirty_contacts_expiry = futureMillis(LAZY_CONTACTS_WRITE_DELAY); // trigger acl.save()
strcpy(reply, "OK");
} else {
strcpy(reply, "Err - invalid params");
}
} else {
strcpy(reply, "Err - bad pubkey");
}
}
} else if (sender_timestamp == 0 && strcmp(command, "get acl") == 0) {
Serial.println("ACL:");
for (int i = 0; i < acl.getNumClients(); i++) {
auto c = acl.getClientByIdx(i);
if (c->permissions == 0) continue; // skip deleted (or guest) entries
Serial.printf("%02X ", c->permissions);
mesh::Utils::printHex(Serial, c->id.pub_key, PUB_KEY_SIZE);
Serial.printf("\n");
}
reply[0] = 0;
} else{
_cli.handleCommand(sender_timestamp, command, reply); // common CLI commands
}
}
bool MyMesh::saveFilter(ClientInfo* client) {
return client->isAdmin(); // only save Admins
}
void MyMesh::loop() {
mesh::Mesh::loop();
if (millisHasNowPassed(next_push) && acl.getNumClients() > 0) {
// check for ACK timeouts
for (int i = 0; i < acl.getNumClients(); i++) {
auto c = acl.getClientByIdx(i);
if (c->extra.room.pending_ack && millisHasNowPassed(c->extra.room.ack_timeout)) {
c->extra.room.push_failures++;
c->extra.room.pending_ack = 0; // reset (TODO: keep prev expected_ack's in a list, incase they arrive LATER, after we retry)
MESH_DEBUG_PRINTLN("pending ACK timed out: push_failures: %d", (uint32_t)c->extra.room.push_failures);
}
}
// check next Round-Robin client, and sync next new post
auto client = acl.getClientByIdx(next_client_idx);
bool did_push = false;
if (client->extra.room.pending_ack == 0 && client->last_activity != 0 &&
client->extra.room.push_failures < 3) { // not already waiting for ACK, AND not evicted, AND retries not max
MESH_DEBUG_PRINTLN("loop - checking for client %02X", (uint32_t)client->id.pub_key[0]);
uint32_t now = getRTCClock()->getCurrentTime();
for (int k = 0, idx = next_post_idx; k < MAX_UNSYNCED_POSTS; k++) {
auto p = &posts[idx];
if (now >= p->post_timestamp + POST_SYNC_DELAY_SECS &&
p->post_timestamp > client->extra.room.sync_since // is new post for this Client?
&& !p->author.matches(client->id)) { // don't push posts to the author
// push this post to Client, then wait for ACK
pushPostToClient(client, *p);
did_push = true;
MESH_DEBUG_PRINTLN("loop - pushed to client %02X: %s", (uint32_t)client->id.pub_key[0], p->text);
break;
}
idx = (idx + 1) % MAX_UNSYNCED_POSTS; // wrap to start of cyclic queue
}
} else {
MESH_DEBUG_PRINTLN("loop - skipping busy (or evicted) client %02X", (uint32_t)client->id.pub_key[0]);
}
next_client_idx = (next_client_idx + 1) % acl.getNumClients(); // round robin polling for each client
if (did_push) {
next_push = futureMillis(SYNC_PUSH_INTERVAL);
} else {
// were no unsynced posts for curr client, so proccess next client much quicker! (in next loop())
next_push = futureMillis(SYNC_PUSH_INTERVAL / 8);
}
}
if (next_flood_advert && millisHasNowPassed(next_flood_advert)) {
mesh::Packet *pkt = createSelfAdvert();
uint32_t delay_millis = 0;
if (pkt) sendFlood(pkt, delay_millis, _prefs.path_hash_mode + 1);
updateFloodAdvertTimer(); // schedule next flood advert
updateAdvertTimer(); // also schedule local advert (so they don't overlap)
} else if (next_local_advert && millisHasNowPassed(next_local_advert)) {
mesh::Packet *pkt = createSelfAdvert();
if (pkt) sendZeroHop(pkt);
updateAdvertTimer(); // schedule next local advert
}
if (set_radio_at && millisHasNowPassed(set_radio_at)) { // apply pending (temporary) radio params
set_radio_at = 0; // clear timer
radio_set_params(pending_freq, pending_bw, pending_sf, pending_cr);
MESH_DEBUG_PRINTLN("Temp radio params");
}
if (revert_radio_at && millisHasNowPassed(revert_radio_at)) { // revert radio params to orig
revert_radio_at = 0; // clear timer
radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
MESH_DEBUG_PRINTLN("Radio params restored");
}
// is pending dirty contacts write needed?
if (dirty_contacts_expiry && millisHasNowPassed(dirty_contacts_expiry)) {
acl.save(_fs, MyMesh::saveFilter);
dirty_contacts_expiry = 0;
}
// TODO: periodically check for OLD/inactive entries in known_clients[], and evict
// update uptime
uint32_t now = millis();
uptime_millis += now - last_millis;
last_millis = now;
}
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