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@@ -0,0 +1,437 @@
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+#include "KissModem.h"
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+#include <CayenneLPP.h>
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+
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+KissModem::KissModem(Stream& serial, mesh::LocalIdentity& identity, mesh::RNG& rng,
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+ mesh::Radio& radio, mesh::MainBoard& board, SensorManager& sensors)
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+ : _serial(serial), _identity(identity), _rng(rng), _radio(radio), _board(board), _sensors(sensors) {
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+ _rx_len = 0;
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+ _rx_escaped = false;
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+ _rx_active = false;
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+ _has_pending_tx = false;
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+ _pending_tx_len = 0;
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+ _setRadioCallback = nullptr;
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+ _setTxPowerCallback = nullptr;
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+ _getCurrentRssiCallback = nullptr;
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+ _getStatsCallback = nullptr;
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+ _config = {0, 0, 0, 0, 0};
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+}
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+
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+void KissModem::begin() {
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+ _rx_len = 0;
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+ _rx_escaped = false;
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+ _rx_active = false;
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+ _has_pending_tx = false;
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+}
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+
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+void KissModem::writeByte(uint8_t b) {
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+ if (b == KISS_FEND) {
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+ _serial.write(KISS_FESC);
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+ _serial.write(KISS_TFEND);
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+ } else if (b == KISS_FESC) {
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+ _serial.write(KISS_FESC);
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+ _serial.write(KISS_TFESC);
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+ } else {
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+ _serial.write(b);
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+ }
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+}
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+
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+void KissModem::writeFrame(uint8_t cmd, const uint8_t* data, uint16_t len) {
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+ _serial.write(KISS_FEND);
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+ writeByte(cmd);
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+ for (uint16_t i = 0; i < len; i++) {
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+ writeByte(data[i]);
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+ }
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+ _serial.write(KISS_FEND);
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+}
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+
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+void KissModem::writeErrorFrame(uint8_t error_code) {
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+ writeFrame(RESP_ERROR, &error_code, 1);
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+}
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+
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+void KissModem::loop() {
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+ while (_serial.available()) {
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+ uint8_t b = _serial.read();
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+
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+ if (b == KISS_FEND) {
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+ if (_rx_active && _rx_len > 0) {
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+ processFrame();
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+ }
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+ _rx_len = 0;
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+ _rx_escaped = false;
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+ _rx_active = true;
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+ continue;
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+ }
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+
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+ if (!_rx_active) continue;
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+
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+ if (b == KISS_FESC) {
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+ _rx_escaped = true;
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+ continue;
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+ }
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+
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+ if (_rx_escaped) {
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+ _rx_escaped = false;
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+ if (b == KISS_TFEND) b = KISS_FEND;
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+ else if (b == KISS_TFESC) b = KISS_FESC;
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+ }
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+
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+ if (_rx_len < KISS_MAX_FRAME_SIZE) {
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+ _rx_buf[_rx_len++] = b;
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+ }
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+ }
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+}
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+
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+void KissModem::processFrame() {
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+ if (_rx_len < 1) return;
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+
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+ uint8_t cmd = _rx_buf[0];
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+ const uint8_t* data = &_rx_buf[1];
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+ uint16_t data_len = _rx_len - 1;
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+
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+ switch (cmd) {
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+ case CMD_DATA:
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+ if (data_len < 2) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ } else if (data_len > KISS_MAX_PACKET_SIZE) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ } else if (_has_pending_tx) {
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+ writeErrorFrame(ERR_TX_PENDING);
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+ } else {
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+ memcpy(_pending_tx, data, data_len);
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+ _pending_tx_len = data_len;
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+ _has_pending_tx = true;
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+ }
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+ break;
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+ case CMD_GET_IDENTITY:
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+ handleGetIdentity();
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+ break;
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+ case CMD_GET_RANDOM:
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+ handleGetRandom(data, data_len);
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+ break;
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+ case CMD_VERIFY_SIGNATURE:
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+ handleVerifySignature(data, data_len);
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+ break;
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+ case CMD_SIGN_DATA:
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+ handleSignData(data, data_len);
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+ break;
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+ case CMD_ENCRYPT_DATA:
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+ handleEncryptData(data, data_len);
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+ break;
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+ case CMD_DECRYPT_DATA:
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+ handleDecryptData(data, data_len);
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+ break;
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+ case CMD_KEY_EXCHANGE:
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+ handleKeyExchange(data, data_len);
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+ break;
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+ case CMD_HASH:
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+ handleHash(data, data_len);
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+ break;
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+ case CMD_SET_RADIO:
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+ handleSetRadio(data, data_len);
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+ break;
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+ case CMD_SET_TX_POWER:
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+ handleSetTxPower(data, data_len);
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+ break;
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+ case CMD_GET_RADIO:
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+ handleGetRadio();
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+ break;
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+ case CMD_GET_TX_POWER:
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+ handleGetTxPower();
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+ break;
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+ case CMD_GET_VERSION:
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+ handleGetVersion();
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+ break;
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+ case CMD_GET_CURRENT_RSSI:
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+ handleGetCurrentRssi();
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+ break;
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+ case CMD_IS_CHANNEL_BUSY:
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+ handleIsChannelBusy();
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+ break;
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+ case CMD_GET_AIRTIME:
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+ handleGetAirtime(data, data_len);
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+ break;
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+ case CMD_GET_NOISE_FLOOR:
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+ handleGetNoiseFloor();
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+ break;
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+ case CMD_GET_STATS:
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+ handleGetStats();
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+ break;
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+ case CMD_GET_BATTERY:
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+ handleGetBattery();
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+ break;
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+ case CMD_PING:
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+ handlePing();
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+ break;
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+ case CMD_GET_SENSORS:
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+ handleGetSensors(data, data_len);
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+ break;
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+ default:
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+ writeErrorFrame(ERR_UNKNOWN_CMD);
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+ break;
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+ }
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+}
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+
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+void KissModem::handleGetIdentity() {
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+ writeFrame(RESP_IDENTITY, _identity.pub_key, PUB_KEY_SIZE);
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+}
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+
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+void KissModem::handleGetRandom(const uint8_t* data, uint16_t len) {
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+ if (len < 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ uint8_t requested = data[0];
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+ if (requested < 1 || requested > 64) {
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+ writeErrorFrame(ERR_INVALID_PARAM);
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+ return;
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+ }
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+
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+ uint8_t buf[64];
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+ _rng.random(buf, requested);
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+ writeFrame(RESP_RANDOM, buf, requested);
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+}
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+
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+void KissModem::handleVerifySignature(const uint8_t* data, uint16_t len) {
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+ if (len < PUB_KEY_SIZE + SIGNATURE_SIZE + 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ mesh::Identity signer(data);
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+ const uint8_t* signature = data + PUB_KEY_SIZE;
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+ const uint8_t* msg = data + PUB_KEY_SIZE + SIGNATURE_SIZE;
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+ uint16_t msg_len = len - PUB_KEY_SIZE - SIGNATURE_SIZE;
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+
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+ uint8_t result = signer.verify(signature, msg, msg_len) ? 0x01 : 0x00;
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+ writeFrame(RESP_VERIFY, &result, 1);
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+}
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+
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+void KissModem::handleSignData(const uint8_t* data, uint16_t len) {
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+ if (len < 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ uint8_t signature[SIGNATURE_SIZE];
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+ _identity.sign(signature, data, len);
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+ writeFrame(RESP_SIGNATURE, signature, SIGNATURE_SIZE);
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+}
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+
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+void KissModem::handleEncryptData(const uint8_t* data, uint16_t len) {
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+ if (len < PUB_KEY_SIZE + 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ const uint8_t* key = data;
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+ const uint8_t* plaintext = data + PUB_KEY_SIZE;
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+ uint16_t plaintext_len = len - PUB_KEY_SIZE;
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+
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+ uint8_t buf[KISS_MAX_FRAME_SIZE];
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+ int encrypted_len = mesh::Utils::encryptThenMAC(key, buf, plaintext, plaintext_len);
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+
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+ if (encrypted_len > 0) {
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+ writeFrame(RESP_ENCRYPTED, buf, encrypted_len);
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+ } else {
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+ writeErrorFrame(ERR_ENCRYPT_FAILED);
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+ }
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+}
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+
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+void KissModem::handleDecryptData(const uint8_t* data, uint16_t len) {
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+ if (len < PUB_KEY_SIZE + CIPHER_MAC_SIZE + 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ const uint8_t* key = data;
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+ const uint8_t* ciphertext = data + PUB_KEY_SIZE;
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+ uint16_t ciphertext_len = len - PUB_KEY_SIZE;
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+
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+ uint8_t buf[KISS_MAX_FRAME_SIZE];
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+ int decrypted_len = mesh::Utils::MACThenDecrypt(key, buf, ciphertext, ciphertext_len);
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+
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+ if (decrypted_len > 0) {
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+ writeFrame(RESP_DECRYPTED, buf, decrypted_len);
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+ } else {
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+ writeErrorFrame(ERR_MAC_FAILED);
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+ }
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+}
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+
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+void KissModem::handleKeyExchange(const uint8_t* data, uint16_t len) {
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+ if (len < PUB_KEY_SIZE) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ uint8_t shared_secret[PUB_KEY_SIZE];
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+ _identity.calcSharedSecret(shared_secret, data);
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+ writeFrame(RESP_SHARED_SECRET, shared_secret, PUB_KEY_SIZE);
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+}
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+
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+void KissModem::handleHash(const uint8_t* data, uint16_t len) {
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+ if (len < 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ uint8_t hash[32];
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+ mesh::Utils::sha256(hash, 32, data, len);
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+ writeFrame(RESP_HASH, hash, 32);
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+}
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+
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+bool KissModem::getPacketToSend(uint8_t* packet, uint16_t* len) {
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+ if (!_has_pending_tx) return false;
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+
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+ memcpy(packet, _pending_tx, _pending_tx_len);
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+ *len = _pending_tx_len;
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+ _has_pending_tx = false;
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+ return true;
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+}
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+
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+void KissModem::onPacketReceived(int8_t snr, int8_t rssi, const uint8_t* packet, uint16_t len) {
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+ uint8_t buf[2 + KISS_MAX_PACKET_SIZE];
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+ buf[0] = (uint8_t)snr;
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+ buf[1] = (uint8_t)rssi;
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+ memcpy(&buf[2], packet, len);
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+ writeFrame(CMD_DATA, buf, 2 + len);
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+}
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+
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+void KissModem::handleSetRadio(const uint8_t* data, uint16_t len) {
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+ if (len < 10) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+ if (!_setRadioCallback) {
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+ writeErrorFrame(ERR_NO_CALLBACK);
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+ return;
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+ }
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+
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+ uint32_t freq_hz, bw_hz;
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+ memcpy(&freq_hz, data, 4);
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+ memcpy(&bw_hz, data + 4, 4);
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+ uint8_t sf = data[8];
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+ uint8_t cr = data[9];
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+
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+ _config.freq_hz = freq_hz;
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+ _config.bw_hz = bw_hz;
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+ _config.sf = sf;
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+ _config.cr = cr;
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+
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+ float freq = freq_hz / 1000000.0f;
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+ float bw = bw_hz / 1000.0f;
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+
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+ _setRadioCallback(freq, bw, sf, cr);
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+ writeFrame(RESP_OK, nullptr, 0);
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+}
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+
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+void KissModem::handleSetTxPower(const uint8_t* data, uint16_t len) {
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+ if (len < 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+ if (!_setTxPowerCallback) {
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+ writeErrorFrame(ERR_NO_CALLBACK);
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+ return;
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+ }
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+
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+ _config.tx_power = data[0];
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+ _setTxPowerCallback(data[0]);
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+ writeFrame(RESP_OK, nullptr, 0);
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+}
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+
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+void KissModem::handleGetRadio() {
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+ uint8_t buf[10];
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+ memcpy(buf, &_config.freq_hz, 4);
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+ memcpy(buf + 4, &_config.bw_hz, 4);
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+ buf[8] = _config.sf;
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+ buf[9] = _config.cr;
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+ writeFrame(RESP_RADIO, buf, 10);
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+}
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+
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+void KissModem::handleGetTxPower() {
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+ writeFrame(RESP_TX_POWER, &_config.tx_power, 1);
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+}
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+
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+void KissModem::handleGetVersion() {
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+ uint8_t buf[2];
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+ buf[0] = KISS_FIRMWARE_VERSION;
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+ buf[1] = 0;
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+ writeFrame(RESP_VERSION, buf, 2);
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+}
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+
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+void KissModem::onTxComplete(bool success) {
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+ uint8_t result = success ? 0x01 : 0x00;
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+ writeFrame(RESP_TX_DONE, &result, 1);
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+}
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+
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+void KissModem::handleGetCurrentRssi() {
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+ if (!_getCurrentRssiCallback) {
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+ writeErrorFrame(ERR_NO_CALLBACK);
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+ return;
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+ }
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+
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+ float rssi = _getCurrentRssiCallback();
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+ int8_t rssi_byte = (int8_t)rssi;
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+ writeFrame(RESP_CURRENT_RSSI, (uint8_t*)&rssi_byte, 1);
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+}
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+
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+void KissModem::handleIsChannelBusy() {
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+ uint8_t busy = _radio.isReceiving() ? 0x01 : 0x00;
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+ writeFrame(RESP_CHANNEL_BUSY, &busy, 1);
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+}
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+
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+void KissModem::handleGetAirtime(const uint8_t* data, uint16_t len) {
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+ if (len < 1) {
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+ writeErrorFrame(ERR_INVALID_LENGTH);
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+ return;
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+ }
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+
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+ uint8_t packet_len = data[0];
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+ uint32_t airtime = _radio.getEstAirtimeFor(packet_len);
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+ writeFrame(RESP_AIRTIME, (uint8_t*)&airtime, 4);
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+}
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+
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+void KissModem::handleGetNoiseFloor() {
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+ int16_t noise_floor = _radio.getNoiseFloor();
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+ writeFrame(RESP_NOISE_FLOOR, (uint8_t*)&noise_floor, 2);
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+}
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+
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+void KissModem::handleGetStats() {
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+ if (!_getStatsCallback) {
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+ writeErrorFrame(ERR_NO_CALLBACK);
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+ return;
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+ }
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+
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+ uint32_t rx, tx, errors;
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+ _getStatsCallback(&rx, &tx, &errors);
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+ uint8_t buf[12];
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|
+ memcpy(buf, &rx, 4);
|
|
|
+ memcpy(buf + 4, &tx, 4);
|
|
|
+ memcpy(buf + 8, &errors, 4);
|
|
|
+ writeFrame(RESP_STATS, buf, 12);
|
|
|
+}
|
|
|
+
|
|
|
+void KissModem::handleGetBattery() {
|
|
|
+ uint16_t mv = _board.getBattMilliVolts();
|
|
|
+ writeFrame(RESP_BATTERY, (uint8_t*)&mv, 2);
|
|
|
+}
|
|
|
+
|
|
|
+void KissModem::handlePing() {
|
|
|
+ writeFrame(RESP_PONG, nullptr, 0);
|
|
|
+}
|
|
|
+
|
|
|
+void KissModem::handleGetSensors(const uint8_t* data, uint16_t len) {
|
|
|
+ if (len < 1) {
|
|
|
+ writeErrorFrame(ERR_INVALID_LENGTH);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint8_t permissions = data[0];
|
|
|
+ CayenneLPP telemetry(255);
|
|
|
+ if (_sensors.querySensors(permissions, telemetry)) {
|
|
|
+ writeFrame(RESP_SENSORS, telemetry.getBuffer(), telemetry.getSize());
|
|
|
+ } else {
|
|
|
+ writeFrame(RESP_SENSORS, nullptr, 0);
|
|
|
+ }
|
|
|
+}
|
ripplebiz