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7da0a5f7ecefbfc387e63190f34c0ffe2108cb83
MeshCore/examples/simple_repeater/main.cpp
Scott Powell 7da0a5f7ec * new RX delays based on SNR
2025-02-04 12:35:53 +11:00

656 lines
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#include <Arduino.h> // needed for PlatformIO
#include <Mesh.h>
#if defined(NRF52_PLATFORM)
#include <InternalFileSystem.h>
#elif defined(ESP32)
#include <SPIFFS.h>
#endif
#define RADIOLIB_STATIC_ONLY 1
#include <RadioLib.h>
#include <helpers/ArduinoHelpers.h>
#include <helpers/StaticPoolPacketManager.h>
#include <helpers/SimpleMeshTables.h>
#include <helpers/IdentityStore.h>
#include <helpers/AdvertDataHelpers.h>
#include <helpers/TxtDataHelpers.h>
#include <RTClib.h>
/* ------------------------------ Config -------------------------------- */
#define FIRMWARE_VER_TEXT "v3 (build: 2 Feb 2025)"
#ifndef LORA_FREQ
#define LORA_FREQ 915.0
#endif
#ifndef LORA_BW
#define LORA_BW 250
#endif
#ifndef LORA_SF
#define LORA_SF 10
#endif
#ifndef LORA_CR
#define LORA_CR 5
#endif
#ifndef LORA_TX_POWER
#define LORA_TX_POWER 20
#endif
#ifndef ADVERT_NAME
#define ADVERT_NAME "repeater"
#endif
#ifndef ADVERT_LAT
#define ADVERT_LAT 0.0
#endif
#ifndef ADVERT_LON
#define ADVERT_LON 0.0
#endif
#ifndef ADMIN_PASSWORD
#define ADMIN_PASSWORD "password"
#endif
#if defined(HELTEC_LORA_V3)
#include <helpers/HeltecV3Board.h>
#include <helpers/CustomSX1262Wrapper.h>
static HeltecV3Board board;
#elif defined(ARDUINO_XIAO_ESP32C3)
#include <helpers/XiaoC3Board.h>
#include <helpers/CustomSX1262Wrapper.h>
#include <helpers/CustomSX1268Wrapper.h>
static XiaoC3Board board;
#elif defined(SEEED_XIAO_S3) || defined(LILYGO_T3S3)
#include <helpers/ESP32Board.h>
#include <helpers/CustomSX1262Wrapper.h>
static ESP32Board board;
#elif defined(RAK_4631)
#include <helpers/nrf52/RAK4631Board.h>
#include <helpers/CustomSX1262Wrapper.h>
static RAK4631Board board;
#else
#error "need to provide a 'board' object"
#endif
/* ------------------------------ Code -------------------------------- */
// Believe it or not, this std C function is busted on some platforms!
static uint32_t _atoi(const char* sp) {
uint32_t n = 0;
while (*sp && *sp >= '0' && *sp <= '9') {
n *= 10;
n += (*sp++ - '0');
}
return n;
}
#define CMD_GET_STATS 0x01
struct RepeaterStats {
uint16_t batt_milli_volts;
uint16_t curr_tx_queue_len;
uint16_t curr_free_queue_len;
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;
uint32_t n_full_events;
};
struct ClientInfo {
mesh::Identity id;
uint32_t last_timestamp;
uint8_t secret[PUB_KEY_SIZE];
int out_path_len;
uint8_t out_path[MAX_PATH_SIZE];
};
#define MAX_CLIENTS 4
// NOTE: need to space the ACK and the reply text apart (in CLI)
#define CLI_REPLY_DELAY_MILLIS 1500
struct NodePrefs { // persisted to file
float airtime_factor;
char node_name[32];
double node_lat, node_lon;
char password[16];
float freq;
uint8_t tx_power_dbm;
uint8_t unused[3];
float rx_delay_base;
};
class MyMesh : public mesh::Mesh {
RadioLibWrapper* my_radio;
FILESYSTEM* _fs;
mesh::MainBoard* _board;
NodePrefs _prefs;
uint8_t reply_data[MAX_PACKET_PAYLOAD];
int num_clients;
ClientInfo known_clients[MAX_CLIENTS];
ClientInfo* putClient(const mesh::Identity& id) {
for (int i = 0; i < num_clients; i++) {
if (id.matches(known_clients[i].id)) return &known_clients[i]; // already known
}
if (num_clients < MAX_CLIENTS) {
auto newClient = &known_clients[num_clients++];
newClient->id = id;
newClient->out_path_len = -1; // initially out_path is unknown
newClient->last_timestamp = 0;
self_id.calcSharedSecret(newClient->secret, id); // calc ECDH shared secret
return newClient;
}
return NULL; // table is full
}
int handleRequest(ClientInfo* sender, uint8_t* payload, size_t payload_len) {
uint32_t now = getRTCClock()->getCurrentTime();
memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
switch (payload[0]) {
case CMD_GET_STATS: {
uint32_t max_age_secs;
if (payload_len >= 5) {
memcpy(&max_age_secs, &payload[1], 4); // first param in request pkt
} else {
max_age_secs = 12*60*60; // default, 12 hours
}
RepeaterStats stats;
stats.batt_milli_volts = board.getBattMilliVolts();
stats.curr_tx_queue_len = _mgr->getOutboundCount();
stats.curr_free_queue_len = _mgr->getFreeCount();
stats.last_rssi = (int16_t) my_radio->getLastRSSI();
stats.n_packets_recv = my_radio->getPacketsRecv();
stats.n_packets_sent = my_radio->getPacketsSent();
stats.total_air_time_secs = getTotalAirTime() / 1000;
stats.total_up_time_secs = _ms->getMillis() / 1000;
stats.n_sent_flood = getNumSentFlood();
stats.n_sent_direct = getNumSentDirect();
stats.n_recv_flood = getNumRecvFlood();
stats.n_recv_direct = getNumRecvDirect();
stats.n_full_events = getNumFullEvents();
memcpy(&reply_data[4], &stats, sizeof(stats));
return 4 + sizeof(stats); // reply_len
}
}
// unknown command
return 0; // reply_len
}
protected:
float getAirtimeBudgetFactor() const override {
return _prefs.airtime_factor;
}
bool allowPacketForward(const mesh::Packet* packet) override {
return true; // Yes, allow packet to be forwarded
}
int calcRxDelay(float score, uint32_t air_time) const override {
return (int) ((pow(_prefs.rx_delay_base, 0.85f - score) - 1.0) * air_time);
}
void onAnonDataRecv(mesh::Packet* packet, uint8_t type, const mesh::Identity& sender, uint8_t* data, size_t len) override {
if (type == PAYLOAD_TYPE_ANON_REQ) { // received an initial request by a possible admin client (unknown at this stage)
uint32_t timestamp;
memcpy(&timestamp, data, 4);
if (memcmp(&data[4], _prefs.password, strlen(_prefs.password)) == 0) { // check for valid password
auto client = putClient(sender); // add to known clients (if not already known)
if (client == NULL || timestamp <= client->last_timestamp) {
MESH_DEBUG_PRINTLN("Client table full, or replay attack!");
return; // FATAL: client table is full -OR- replay attack
}
MESH_DEBUG_PRINTLN("Login success!");
client->last_timestamp = timestamp;
uint32_t now = getRTCClock()->getCurrentTime();
memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
memcpy(&reply_data[4], "OK", 2);
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->secret, packet->path, packet->path_len,
PAYLOAD_TYPE_RESPONSE, reply_data, 4 + 2);
if (path) sendFlood(path);
} else {
mesh::Packet* reply = createDatagram(PAYLOAD_TYPE_RESPONSE, sender, client->secret, reply_data, 4 + 2);
if (reply) {
if (client->out_path_len >= 0) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len);
} else {
sendFlood(reply);
}
}
}
} else {
data[4+8] = 0; // ensure null terminator
MESH_DEBUG_PRINTLN("Incorrect password: %s", &data[4]);
}
}
}
int matching_peer_indexes[MAX_CLIENTS];
int searchPeersByHash(const uint8_t* hash) override {
int n = 0;
for (int i = 0; i < num_clients; i++) {
if (known_clients[i].id.isHashMatch(hash)) {
matching_peer_indexes[n++] = i; // store the INDEXES of matching contacts (for subsequent 'peer' methods)
}
}
return n;
}
void getPeerSharedSecret(uint8_t* dest_secret, int peer_idx) override {
int i = matching_peer_indexes[peer_idx];
if (i >= 0 && i < num_clients) {
// lookup pre-calculated shared_secret
memcpy(dest_secret, known_clients[i].secret, PUB_KEY_SIZE);
} else {
MESH_DEBUG_PRINTLN("getPeerSharedSecret: Invalid peer idx: %d", i);
}
}
void onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender_idx, const uint8_t* secret, uint8_t* data, size_t len) override {
int i = matching_peer_indexes[sender_idx];
if (i < 0 || i >= num_clients) { // 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 = &known_clients[i];
if (type == PAYLOAD_TYPE_REQ) { // request (from a Known admin client!)
uint32_t timestamp;
memcpy(&timestamp, data, 4);
if (timestamp > client->last_timestamp) { // prevent replay attacks
int reply_len = handleRequest(client, &data[4], len - 4);
if (reply_len == 0) return; // invalid command
client->last_timestamp = timestamp;
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);
} else {
mesh::Packet* reply = createDatagram(PAYLOAD_TYPE_RESPONSE, client->id, secret, reply_data, reply_len);
if (reply) {
if (client->out_path_len >= 0) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len);
} else {
sendFlood(reply);
}
}
}
} else {
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
}
} else if (type == PAYLOAD_TYPE_TXT_MSG && len > 5) { // a CLI command
uint32_t sender_timestamp;
memcpy(&sender_timestamp, data, 4); // timestamp (by sender's RTC clock - which could be wrong)
uint 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 text type received: flags=%02x", (uint32_t)flags);
} else if (sender_timestamp > client->last_timestamp) { // prevent replay attacks
client->last_timestamp = sender_timestamp;
// 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);
mesh::Packet* ack = createAck(ack_hash);
if (ack) {
if (client->out_path_len < 0) {
sendFlood(ack);
} else {
sendDirect(ack, client->out_path, client->out_path_len);
}
}
uint8_t temp[166];
handleCommand(sender_timestamp, (const char *) &data[5], (char *) &temp[5]);
int text_len = strlen((char *) &temp[5]);
if (text_len > 0) {
uint32_t timestamp = getRTCClock()->getCurrentTime();
if (timestamp == sender_timestamp) {
// WORKAROUND: the two timestamps need to be different, in the CLI view
timestamp++;
}
memcpy(temp, &timestamp, 4); // mostly an extra blob to help make packet_hash unique
temp[4] = (TXT_TYPE_PLAIN << 2); // TODO: change this to TXT_TYPE_CLI_DATA soon
// 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 < 0) {
sendFlood(reply, CLI_REPLY_DELAY_MILLIS);
} else {
sendDirect(reply, client->out_path, client->out_path_len, CLI_REPLY_DELAY_MILLIS);
}
}
}
} else {
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
}
}
}
bool 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) override {
// TODO: prevent replay attacks
int i = matching_peer_indexes[sender_idx];
if (i >= 0 && i < num_clients) { // 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 = &known_clients[i];
memcpy(client->out_path, path, client->out_path_len = path_len); // store a copy of path, for sendDirect()
} else {
MESH_DEBUG_PRINTLN("onPeerPathRecv: invalid peer idx: %d", i);
}
// NOTE: no reciprocal path send!!
return false;
}
public:
MyMesh(mesh::MainBoard& board, RadioLibWrapper& radio, mesh::MillisecondClock& ms, mesh::RNG& rng, mesh::RTCClock& rtc, mesh::MeshTables& tables)
: mesh::Mesh(radio, ms, rng, rtc, *new StaticPoolPacketManager(32), tables), _board(&board)
{
my_radio = &radio;
num_clients = 0;
// defaults
_prefs.airtime_factor = 1.0; // one half
_prefs.rx_delay_base = 10.0;
strncpy(_prefs.node_name, ADVERT_NAME, sizeof(_prefs.node_name)-1);
_prefs.node_name[sizeof(_prefs.node_name)-1] = 0; // truncate if necessary
_prefs.node_lat = ADVERT_LAT;
_prefs.node_lon = ADVERT_LON;
strncpy(_prefs.password, ADMIN_PASSWORD, sizeof(_prefs.password)-1);
_prefs.password[sizeof(_prefs.password)-1] = 0; // truncate if necessary
_prefs.freq = LORA_FREQ;
_prefs.tx_power_dbm = LORA_TX_POWER;
memset(_prefs.unused, 0, sizeof(_prefs.unused));
}
float getFreqPref() const { return _prefs.freq; }
uint8_t getTxPowerPref() const { return _prefs.tx_power_dbm; }
void begin(FILESYSTEM* fs) {
mesh::Mesh::begin();
_fs = fs;
// load persisted prefs
if (_fs->exists("/node_prefs")) {
File file = _fs->open("/node_prefs");
if (file) {
file.read((uint8_t *) &_prefs, sizeof(_prefs));
file.close();
}
}
}
void savePrefs() {
#if defined(NRF52_PLATFORM)
File file = _fs->open("/node_prefs", FILE_O_WRITE);
if (file) { file.seek(0); file.truncate(); }
#else
File file = _fs->open("/node_prefs", "w", true);
#endif
if (file) {
file.write((const uint8_t *)&_prefs, sizeof(_prefs));
file.close();
}
}
void sendSelfAdvertisement(int delay_millis) {
uint8_t app_data[MAX_ADVERT_DATA_SIZE];
uint8_t app_data_len;
{
AdvertDataBuilder builder(ADV_TYPE_REPEATER, _prefs.node_name, _prefs.node_lat, _prefs.node_lon);
app_data_len = builder.encodeTo(app_data);
}
mesh::Packet* pkt = createAdvert(self_id, app_data, app_data_len);
if (pkt) {
sendFlood(pkt, delay_millis);
} else {
MESH_DEBUG_PRINTLN("ERROR: unable to create advertisement packet!");
}
}
void handleCommand(uint32_t sender_timestamp, const char* command, char reply[]) {
while (*command == ' ') command++; // skip leading spaces
if (memcmp(command, "reboot", 6) == 0) {
board.reboot(); // doesn't return
} else if (memcmp(command, "advert", 6) == 0) {
sendSelfAdvertisement(400);
strcpy(reply, "OK - Advert sent");
} else if (memcmp(command, "clock sync", 10) == 0) {
uint32_t curr = getRTCClock()->getCurrentTime();
if (sender_timestamp > curr) {
getRTCClock()->setCurrentTime(sender_timestamp + 1);
strcpy(reply, "OK - clock set");
} else {
strcpy(reply, "ERR: clock cannot go backwards");
}
} else if (memcmp(command, "start ota", 9) == 0) {
if (_board->startOTAUpdate()) {
strcpy(reply, "OK");
} else {
strcpy(reply, "Error");
}
} else if (memcmp(command, "clock", 5) == 0) {
uint32_t now = getRTCClock()->getCurrentTime();
DateTime dt = DateTime(now);
sprintf(reply, "%02d:%02d - %d/%d/%d UTC", dt.hour(), dt.minute(), dt.day(), dt.month(), dt.year());
} else if (memcmp(command, "time ", 5) == 0) { // set time (to epoch seconds)
uint32_t secs = _atoi(&command[5]);
uint32_t curr = getRTCClock()->getCurrentTime();
if (secs > curr) {
getRTCClock()->setCurrentTime(secs);
strcpy(reply, "(OK - clock set!)");
} else {
strcpy(reply, "(ERR: clock cannot go backwards)");
}
} else if (memcmp(command, "password ", 9) == 0) {
// change admin password
strncpy(_prefs.password, &command[9], sizeof(_prefs.password)-1);
_prefs.password[sizeof(_prefs.password)-1] = 0; // truncate if necesary
savePrefs();
sprintf(reply, "password now: %s", _prefs.password); // echo back just to let admin know for sure!!
} else if (memcmp(command, "set ", 4) == 0) {
const char* config = &command[4];
if (memcmp(config, "af ", 3) == 0) {
_prefs.airtime_factor = atof(&config[3]);
savePrefs();
strcpy(reply, "OK");
} else if (memcmp(config, "name ", 5) == 0) {
strncpy(_prefs.node_name, &config[5], sizeof(_prefs.node_name)-1);
_prefs.node_name[sizeof(_prefs.node_name)-1] = 0; // truncate if nec
savePrefs();
strcpy(reply, "OK");
} else if (memcmp(config, "lat ", 4) == 0) {
_prefs.node_lat = atof(&config[4]);
savePrefs();
strcpy(reply, "OK");
} else if (memcmp(config, "lon ", 4) == 0) {
_prefs.node_lon = atof(&config[4]);
savePrefs();
strcpy(reply, "OK");
} else if (memcmp(config, "tx ", 3) == 0) {
_prefs.tx_power_dbm = atoi(&config[3]);
savePrefs();
strcpy(reply, "OK - reboot to apply");
} else if (sender_timestamp == 0 && memcmp(config, "freq ", 5) == 0) {
_prefs.freq = atof(&config[5]);
savePrefs();
strcpy(reply, "OK - reboot to apply");
} else {
sprintf(reply, "unknown config: %s", config);
}
} else if (sender_timestamp == 0 && strcmp(command, "erase") == 0) {
#if defined(NRF52_PLATFORM)
bool s = InternalFS.format();
#elif defined(ESP32)
bool s = SPIFFS.format();
#else
#error "need to implement file system erase"
#endif
sprintf(reply, "File system erase: %s", s ? "OK" : "Err");
} else if (memcmp(command, "ver", 3) == 0) {
strcpy(reply, FIRMWARE_VER_TEXT);
} else {
sprintf(reply, "Unknown: %s (commands: reboot, advert, clock, set, ver, password, start ota)", command);
}
}
};
#if defined(NRF52_PLATFORM)
RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, SPI);
#elif defined(P_LORA_SCLK)
SPIClass spi;
RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
#else
RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
#endif
StdRNG fast_rng;
SimpleMeshTables tables;
#ifdef ESP32
ESP32RTCClock rtc_clock;
#else
VolatileRTCClock rtc_clock;
#endif
MyMesh the_mesh(board, *new WRAPPER_CLASS(radio, board), *new ArduinoMillis(), fast_rng, rtc_clock, tables);
void halt() {
while (1) ;
}
static char command[80];
void setup() {
Serial.begin(115200);
delay(1000);
board.begin();
#ifdef ESP32
rtc_clock.begin();
#endif
#ifdef SX126X_DIO3_TCXO_VOLTAGE
float tcxo = SX126X_DIO3_TCXO_VOLTAGE;
#else
float tcxo = 1.6f;
#endif
#if defined(NRF52_PLATFORM)
SPI.setPins(P_LORA_MISO, P_LORA_SCLK, P_LORA_MOSI);
SPI.begin();
#elif defined(P_LORA_SCLK)
spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
#endif
int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 8, tcxo);
if (status != RADIOLIB_ERR_NONE) {
delay(5000);
Serial.print("ERROR: radio init failed: ");
Serial.println(status);
halt();
}
radio.setCRC(0);
#ifdef SX126X_CURRENT_LIMIT
radio.setCurrentLimit(SX126X_CURRENT_LIMIT);
#endif
#ifdef SX126X_DIO2_AS_RF_SWITCH
radio.setDio2AsRfSwitch(SX126X_DIO2_AS_RF_SWITCH);
#endif
fast_rng.begin(radio.random(0x7FFFFFFF));
FILESYSTEM* fs;
#if defined(NRF52_PLATFORM)
InternalFS.begin();
fs = &InternalFS;
IdentityStore store(InternalFS, "");
#elif defined(ESP32)
SPIFFS.begin(true);
fs = &SPIFFS;
IdentityStore store(SPIFFS, "/identity");
#else
#error "need to define filesystem"
#endif
if (!store.load("_main", the_mesh.self_id)) {
MESH_DEBUG_PRINTLN("Generating new keypair");
RadioNoiseListener rng(radio);
the_mesh.self_id = mesh::LocalIdentity(&rng); // create new random identity
store.save("_main", the_mesh.self_id);
}
Serial.print("Repeater ID: ");
mesh::Utils::printHex(Serial, the_mesh.self_id.pub_key, PUB_KEY_SIZE); Serial.println();
command[0] = 0;
the_mesh.begin(fs);
if (LORA_FREQ != the_mesh.getFreqPref()) {
radio.setFrequency(the_mesh.getFreqPref());
}
if (LORA_TX_POWER != the_mesh.getTxPowerPref()) {
radio.setOutputPower(the_mesh.getTxPowerPref());
}
// send out initial Advertisement to the mesh
the_mesh.sendSelfAdvertisement(2000);
}
void loop() {
int len = strlen(command);
while (Serial.available() && len < sizeof(command)-1) {
char c = Serial.read();
if (c != '\n') {
command[len++] = c;
command[len] = 0;
}
Serial.print(c);
}
if (len == sizeof(command)-1) { // command buffer full
command[sizeof(command)-1] = '\r';
}
if (len > 0 && command[len - 1] == '\r') { // received complete line
command[len - 1] = 0; // replace newline with C string null terminator
char reply[160];
the_mesh.handleCommand(0, command, reply); // NOTE: there is no sender_timestamp via serial!
if (reply[0]) {
Serial.print(" -> "); Serial.println(reply);
}
command[0] = 0; // reset command buffer
}
the_mesh.loop();
// TODO: periodically check for OLD/inactive entries in known_clients[], and evict
}
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