585 lines
17 KiB
C++
585 lines
17 KiB
C++
// Basic Config
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#if (HAS_LORA)
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#include "lorawan.h"
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// Local logging Tag
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static const char TAG[] = "lora";
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// Saves the LMIC structure during deep sleep
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RTC_DATA_ATTR lmic_t RTC_LMIC;
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#if CLOCK_ERROR_PROCENTAGE > 7
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#warning CLOCK_ERROR_PROCENTAGE value in lmic_config.h is too high; values > 7 will cause side effects
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#endif
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#if (TIME_SYNC_LORAWAN)
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#ifndef LMIC_ENABLE_DeviceTimeReq
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#define LMIC_ENABLE_DeviceTimeReq 1
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#endif
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#endif
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static QueueHandle_t LoraSendQueue;
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TaskHandle_t lmicTask = NULL, lorasendTask = NULL;
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char lmic_event_msg[LMIC_EVENTMSG_LEN]; // display buffer for LMIC event message
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class MyHalConfig_t : public Arduino_LMIC::HalConfiguration_t {
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public:
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MyHalConfig_t(){};
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// set SPI pins to board configuration, pins may come from pins_arduino.h
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virtual void begin(void) override {
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SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_CS);
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}
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// virtual void end(void) override
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// virtual ostime_t setModuleActive(bool state) override
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};
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static MyHalConfig_t myHalConfig{};
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// LMIC pin mapping for Hope RFM95 / HPDtek HPD13A transceivers
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static const lmic_pinmap myPinmap = {
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.nss = LORA_CS,
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.rxtx = LMIC_UNUSED_PIN,
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.rst = LORA_RST == NOT_A_PIN ? LMIC_UNUSED_PIN : LORA_RST,
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.dio = {LORA_IRQ, LORA_IO1,
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LORA_IO2 == NOT_A_PIN ? LMIC_UNUSED_PIN : LORA_IO2},
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.rxtx_rx_active = LMIC_UNUSED_PIN,
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.rssi_cal = 10,
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.spi_freq = 8000000, // 8MHz
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.pConfig = &myHalConfig};
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void lora_setupForNetwork(bool preJoin) {
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if (preJoin) {
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#if CFG_LMIC_US_like
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// in the US, with TTN, it saves join time if we start on subband 1
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// (channels 8-15). This will get overridden after the join by
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// parameters from the network. If working with other networks or in
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// other regions, this will need to be changed.
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LMIC_selectSubBand(1);
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#elif CFG_LMIC_EU_like
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// settings for TheThingsNetwork
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// Enable link check validation
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LMIC_setLinkCheckMode(1);
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#endif
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} else {
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// set data rate adaptation according to saved setting
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LMIC_setAdrMode(cfg.adrmode);
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// set data rate and transmit power to stored device values if no ADR
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if (!cfg.adrmode)
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LMIC_setDrTxpow(assertDR(cfg.loradr), cfg.txpower);
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// show current devaddr
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ESP_LOGI(TAG, "DEVaddr: 0x%08X | Network ID: 0x%06X | Network Type: %d",
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LMIC.devaddr, LMIC.netid & 0x001FFFFF, LMIC.netid & 0x00E00000);
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ESP_LOGI(TAG, "RSSI: %d | SNR: %d", LMIC.rssi, (LMIC.snr + 2) / 4);
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ESP_LOGI(TAG, "Radio parameters: %s | %s | %s",
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getSfName(updr2rps(LMIC.datarate)),
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getBwName(updr2rps(LMIC.datarate)),
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getCrName(updr2rps(LMIC.datarate)));
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}
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}
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// DevEUI generator using devices's MAC address
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void gen_lora_deveui(uint8_t *pdeveui) {
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uint8_t *p = pdeveui, dmac[6];
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int i = 0;
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esp_efuse_mac_get_default(dmac);
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// deveui is LSB, we reverse it so TTN DEVEUI display
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// will remain the same as MAC address
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// MAC is 6 bytes, devEUI 8, set first 2 ones
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// with an arbitrary value
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*p++ = 0xFF;
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*p++ = 0xFE;
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// Then next 6 bytes are mac address reversed
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for (i = 0; i < 6; i++) {
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*p++ = dmac[5 - i];
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}
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}
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/* new version, does it with well formed mac according IEEE spec, but is
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breaking change
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// DevEUI generator using devices's MAC address
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void gen_lora_deveui(uint8_t *pdeveui) {
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uint8_t *p = pdeveui, dmac[6];
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esp_efuse_mac_get_default(dmac);
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// deveui is LSB, we reverse it so TTN DEVEUI display
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// will remain the same as MAC address
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// MAC is 6 bytes, devEUI 8, set middle 2 ones
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// to an arbitrary value
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*p++ = dmac[5];
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*p++ = dmac[4];
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*p++ = dmac[3];
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*p++ = 0xfe;
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*p++ = 0xff;
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*p++ = dmac[2];
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*p++ = dmac[1];
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*p++ = dmac[0];
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}
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*/
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// Function to do a byte swap in a byte array
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void RevBytes(unsigned char *b, size_t c) {
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u1_t i;
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for (i = 0; i < c / 2; i++) {
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unsigned char t = b[i];
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b[i] = b[c - 1 - i];
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b[c - 1 - i] = t;
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}
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}
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// LMIC callback functions
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void os_getDevKey(u1_t *buf) {
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#ifndef LORA_ABP
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memcpy(buf, APPKEY, 16);
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#endif
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}
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void os_getArtEui(u1_t *buf) {
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#ifndef LORA_ABP
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memcpy(buf, APPEUI, 8);
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RevBytes(buf, 8); // TTN requires it in LSB First order, so we swap bytes
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#endif
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}
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void os_getDevEui(u1_t *buf) {
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#ifndef LORA_ABP
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int i = 0, k = 0;
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memcpy(buf, DEVEUI, 8); // get fixed DEVEUI from loraconf.h
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for (i = 0; i < 8; i++) {
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k += buf[i];
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}
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if (k) {
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RevBytes(buf, 8); // use fixed DEVEUI and swap bytes to LSB format
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} else {
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gen_lora_deveui(buf); // generate DEVEUI from device's MAC
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}
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#endif
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}
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#if (VERBOSE)
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// Display a key
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void printKey(const char *name, const uint8_t *key, uint8_t len, bool lsb) {
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const uint8_t *p;
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char keystring[len + 1] = "", keybyte[3];
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for (uint8_t i = 0; i < len; i++) {
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p = lsb ? key + len - i - 1 : key + i;
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snprintf(keybyte, 3, "%02X", *p);
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strncat(keystring, keybyte, 2);
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}
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ESP_LOGI(TAG, "%s: %s", name, keystring);
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}
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// Display OTAA keys
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void showLoraKeys(void) {
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// LMIC may not have used callback to fill
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// all EUI buffer so we do it here to a temp
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// buffer to be able to display them
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uint8_t buf[32];
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os_getDevEui((u1_t *)buf);
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printKey("DevEUI", buf, 8, true);
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os_getArtEui((u1_t *)buf);
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printKey("AppEUI", buf, 8, true);
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os_getDevKey((u1_t *)buf);
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printKey("AppKey", buf, 16, false);
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}
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#endif // VERBOSE
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// LMIC send task
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void lora_send(void *pvParameters) {
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_ASSERT((uint32_t)pvParameters == 1); // FreeRTOS check
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MessageBuffer_t SendBuffer;
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while (1) {
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// postpone until we are joined if we are not
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while (!LMIC.devaddr) {
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vTaskDelay(pdMS_TO_TICKS(500));
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}
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// fetch next or wait for payload to send from queue
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// do not delete item from queue until it is transmitted
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if (xQueuePeek(LoraSendQueue, &SendBuffer, portMAX_DELAY) != pdTRUE) {
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ESP_LOGE(TAG, "Premature return from xQueueReceive() with no data!");
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continue;
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}
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// attempt to transmit payload
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switch (LMIC_setTxData2_strict(SendBuffer.MessagePort, SendBuffer.Message,
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SendBuffer.MessageSize,
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(cfg.countermode & 0x02))) {
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case LMIC_ERROR_SUCCESS:
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#if (TIME_SYNC_LORASERVER)
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// if last packet sent was a timesync request, store TX timestamp
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if (SendBuffer.MessagePort == TIMEPORT)
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// store LMIC time when we started transmit of timesync request
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timesync_store(osticks2ms(os_getTime()), timesync_tx);
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#endif
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ESP_LOGI(TAG, "%d byte(s) sent to LORA", SendBuffer.MessageSize);
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// delete sent item from queue
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xQueueReceive(LoraSendQueue, &SendBuffer, (TickType_t)0);
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break;
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case LMIC_ERROR_TX_BUSY: // LMIC already has a tx message pending
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case LMIC_ERROR_TX_FAILED: // message was not sent
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vTaskDelay(pdMS_TO_TICKS(500 + random(400))); // wait a while
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break;
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case LMIC_ERROR_TX_TOO_LARGE: // message size exceeds LMIC buffer size
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case LMIC_ERROR_TX_NOT_FEASIBLE: // message too large for current
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// datarate
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ESP_LOGI(TAG, "Message too large to send, message not sent and deleted");
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// we need some kind of error handling here -> to be done
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break;
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default: // other LMIC return code
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ESP_LOGE(TAG, "LMIC error, message not sent and deleted");
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} // switch
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delay(2); // yield to CPU
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} // while(1)
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}
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esp_err_t lmic_init(void) {
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_ASSERT(SEND_QUEUE_SIZE > 0);
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LoraSendQueue = xQueueCreate(SEND_QUEUE_SIZE, sizeof(MessageBuffer_t));
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if (LoraSendQueue == 0) {
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ESP_LOGE(TAG, "Could not create LORA send queue. Aborting.");
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return ESP_FAIL;
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}
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ESP_LOGI(TAG, "LORA send queue created, size %d Bytes",
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SEND_QUEUE_SIZE * sizeof(MessageBuffer_t));
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// setup LMIC stack
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os_init_ex(&myPinmap); // initialize lmic run-time environment
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// register a callback for downlink messages and lmic events.
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// We aren't trying to write reentrant code, so pUserData is NULL.
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// LMIC_reset() doesn't affect callbacks, so we can do this first.
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LMIC_registerRxMessageCb(myRxCallback, NULL);
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LMIC_registerEventCb(myEventCallback, NULL);
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// to come with future LMIC version
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// LMIC_registerBattLevelCb(myBattLevelCb, NULL);
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// Reset the MAC state. Session and pending data transfers will be
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// discarded.
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LMIC_reset();
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// This tells LMIC to make the receive windows bigger, in case your clock is
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// faster or slower. This causes the transceiver to be earlier switched on,
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// so consuming more power. You may sharpen (reduce) CLOCK_ERROR_PERCENTAGE
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// in src/lmic_config.h if you are limited on battery.
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#ifdef CLOCK_ERROR_PROCENTAGE
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LMIC_setClockError(CLOCK_ERROR_PROCENTAGE * MAX_CLOCK_ERROR / 1000);
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#endif
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// Pass ABP parameters to LMIC_setSession
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#ifdef LORA_ABP
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setABPParameters(); // These parameters are defined as macro in loraconf.h
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// load saved session from RTC, if we have one
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if (RTC_runmode == RUNMODE_WAKEUP) {
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LoadLMICFromRTC();
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} else {
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uint8_t appskey[sizeof(APPSKEY)];
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uint8_t nwkskey[sizeof(NWKSKEY)];
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memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
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memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
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LMIC_setSession(NETID, DEVADDR, nwkskey, appskey);
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}
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// Pass OTA parameters to LMIC_setSession
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#else
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// load saved session from RTC, if we have one
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if (RTC_runmode == RUNMODE_WAKEUP)
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LoadLMICFromRTC();
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if (!LMIC_startJoining())
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ESP_LOGI(TAG, "Already joined");
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#endif
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// start lmic loop task
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ESP_LOGI(TAG, "Starting LMIC...");
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xTaskCreatePinnedToCore(lmictask, // task function
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"lmictask", // name of task
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4096, // stack size of task
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(void *)1, // parameter of the task
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2, // priority of the task
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&lmicTask, // task handle
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1); // CPU core
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// start lora send task
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xTaskCreatePinnedToCore(lora_send, // task function
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"lorasendtask", // name of task
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3072, // stack size of task
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(void *)1, // parameter of the task
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1, // priority of the task
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&lorasendTask, // task handle
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1); // CPU core
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return ESP_OK;
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}
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void lora_enqueuedata(MessageBuffer_t *message) {
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// enqueue message in LORA send queue
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if (xQueueSendToBack(LoraSendQueue, (void *)message, (TickType_t)0) !=
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pdTRUE) {
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snprintf(lmic_event_msg + 14, LMIC_EVENTMSG_LEN - 14, "<>");
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ESP_LOGW(TAG, "LORA sendqueue is full");
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} else {
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// add Lora send queue length to display
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snprintf(lmic_event_msg + 14, LMIC_EVENTMSG_LEN - 14, "%2u",
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uxQueueMessagesWaiting(LoraSendQueue));
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}
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}
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void lora_queuereset(void) { xQueueReset(LoraSendQueue); }
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uint32_t lora_queuewaiting(void) {
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return uxQueueMessagesWaiting(LoraSendQueue);
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}
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// LMIC loop task
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void lmictask(void *pvParameters) {
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_ASSERT((uint32_t)pvParameters == 1);
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while (1) {
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os_runloop_once(); // execute lmic scheduled jobs and events
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delay(2); // yield to CPU
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}
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}
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// lmic event handler
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void myEventCallback(void *pUserData, ev_t ev) {
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// using message descriptors from LMIC library
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static const char *const evNames[] = {LMIC_EVENT_NAME_TABLE__INIT};
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// get current length of lora send queue
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uint8_t const msgWaiting = uxQueueMessagesWaiting(LoraSendQueue);
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// get current event message
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if (ev < sizeof(evNames) / sizeof(evNames[0]))
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snprintf(lmic_event_msg, LMIC_EVENTMSG_LEN, "%-16s",
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evNames[ev] + 3); // +3 to strip "EV_"
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else
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snprintf(lmic_event_msg, LMIC_EVENTMSG_LEN, "LMIC event %-4u ", ev);
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// process current event message
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switch (ev) {
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case EV_TXCOMPLETE:
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// -> processed in lora_send()
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break;
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case EV_RXCOMPLETE:
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// -> processed in myRxCallback()
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break;
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case EV_JOINING:
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// do the network-specific setup prior to join.
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lora_setupForNetwork(true);
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break;
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case EV_JOINED:
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// do the after join network-specific setup.
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lora_setupForNetwork(false);
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break;
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case EV_JOIN_FAILED:
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// must call LMIC_reset() to stop joining
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// otherwise join procedure continues.
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LMIC_reset();
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break;
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case EV_JOIN_TXCOMPLETE:
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// replace descriptor from library with more descriptive term
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snprintf(lmic_event_msg, LMIC_EVENTMSG_LEN, "%-16s", "JOIN_WAIT");
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break;
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default:
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break;
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}
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// add Lora send queue length to display
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if (msgWaiting)
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snprintf(lmic_event_msg + 14, LMIC_EVENTMSG_LEN - 14, "%2u", msgWaiting);
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// print event
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ESP_LOGD(TAG, "%s", lmic_event_msg);
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}
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uint8_t myBattLevelCb(void *pUserData) {
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// set the battery value to send by LMIC in MAC Command
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// DevStatusAns. Available defines in lorabase.h:
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// MCMD_DEVS_EXT_POWER = 0x00, // external power supply
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// MCMD_DEVS_BATT_MIN = 0x01, // min battery value
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// MCMD_DEVS_BATT_MAX = 0xFE, // max battery value
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// MCMD_DEVS_BATT_NOINFO = 0xFF, // unknown battery level
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// we calculate the applicable value from MCMD_DEVS_BATT_MIN to
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// MCMD_DEVS_BATT_MAX from bat_percent value
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uint8_t const batt_percent = read_battlevel();
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if (batt_percent == 0)
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return MCMD_DEVS_BATT_NOINFO;
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else
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#ifdef HAS_PMU
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if (pmu.isVBUSPlug())
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return MCMD_DEVS_EXT_POWER;
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#elif defined HAS_IP5306
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if (IP5306_GetPowerSource())
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return MCMD_DEVS_EXT_POWER;
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#endif // HAS_PMU
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return (batt_percent / 100.0 * (MCMD_DEVS_BATT_MAX - MCMD_DEVS_BATT_MIN + 1));
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}
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// event EV_RXCOMPLETE message handler
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void myRxCallback(void *pUserData, uint8_t port, const uint8_t *pMsg,
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size_t nMsg) {
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// display amount of received data
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if (nMsg)
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ESP_LOGI(TAG, "Received %u byte(s) of payload on port %u", nMsg, port);
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else if (port)
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ESP_LOGI(TAG, "Received empty message on port %u", port);
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switch (port) {
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// decode mac messages if we want to print those
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#if (VERBOSE)
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case MACPORT:
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// decode downlink MAC commands
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if (LMIC.dataBeg)
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mac_decode(LMIC.frame, LMIC.dataBeg, true);
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// decode uplink MAC commands
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if (LMIC.pendMacLen)
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mac_decode(LMIC.pendMacData, LMIC.pendMacLen, false);
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break; // do not fallthrough to default, we are done
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#endif
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// rcommand received -> call interpreter
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case RCMDPORT:
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rcommand(pMsg, nMsg);
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break;
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// timeserver answer -> call timesync processor
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#if (TIME_SYNC_LORASERVER)
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case TIMEPORT:
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// get and store gwtime from payload
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timesync_serverAnswer(const_cast<uint8_t *>(pMsg), nMsg);
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break;
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#endif
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} // switch
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}
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const char *getSfName(rps_t rps) {
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const char *const t[] = {"FSK", "SF7", "SF8", "SF9",
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"SF10", "SF11", "SF12", "SF?"};
|
|
return t[getSf(rps)];
|
|
}
|
|
|
|
const char *getBwName(rps_t rps) {
|
|
const char *const t[] = {"BW125", "BW250", "BW500", "BW?"};
|
|
return t[getBw(rps)];
|
|
}
|
|
|
|
const char *getCrName(rps_t rps) {
|
|
const char *const t[] = {"CR 4/5", "CR 4/6", "CR 4/7", "CR 4/8"};
|
|
return t[getCr(rps)];
|
|
}
|
|
|
|
#if (VERBOSE)
|
|
// decode LORAWAN MAC message
|
|
// see
|
|
// https://github.com/mcci-catena/arduino-lmic/blob/master/doc/LoRaWAN-at-a-glance.pdf
|
|
void mac_decode(const uint8_t cmd[], const uint8_t cmdlen, bool is_down) {
|
|
|
|
if (!cmdlen)
|
|
return;
|
|
|
|
uint8_t foundcmd[cmdlen], cursor = 0;
|
|
|
|
// select CID resolve table
|
|
const mac_t *p;
|
|
p = is_down ? MACdn_table : MACup_table;
|
|
const int tablesize = is_down ? MACdn_tSize : MACup_tSize;
|
|
const String MACdir = is_down ? "-->" : "<--";
|
|
|
|
while (cursor < cmdlen) {
|
|
|
|
// get number of commands in CID table
|
|
int i = tablesize;
|
|
|
|
// lookup cmd in CID table
|
|
while (i--) {
|
|
if (cmd[cursor] == (p + i)->cid) { // lookup command in CID table
|
|
cursor++; // strip 1 byte CID
|
|
if ((cursor + (p + i)->params) <= cmdlen) {
|
|
memmove(foundcmd, cmd + cursor,
|
|
(p + i)->params); // strip opcode from cmd array
|
|
cursor += (p + i)->params;
|
|
ESP_LOGD(TAG, "%s %s", MACdir, (p + i)->cmdname);
|
|
} else
|
|
ESP_LOGD(TAG, "%s MAC command 0x%02X with missing parameter(s)",
|
|
MACdir, (p + i)->cid);
|
|
break; // command found -> exit table lookup loop
|
|
} // end of command validation
|
|
} // end of command table lookup loop
|
|
if (i < 0) { // command not found -> skip it
|
|
ESP_LOGD(TAG, "%s Unknown MAC command 0x%02X", MACdir, cmd[cursor]);
|
|
cursor++;
|
|
}
|
|
} // command parsing loop
|
|
|
|
} // mac_decode()
|
|
#endif // VERBOSE
|
|
|
|
// following code snippet was taken from
|
|
// https://github.com/JackGruber/ESP32-LMIC-DeepSleep-example/blob/master/src/main.cpp
|
|
|
|
void SaveLMICToRTC(int deepsleep_sec) {
|
|
RTC_LMIC = LMIC;
|
|
|
|
// ESP32 can't track millis during DeepSleep and no option to advance
|
|
// millis after DeepSleep. Therefore reset DutyCyles
|
|
|
|
unsigned long now = millis();
|
|
|
|
// EU Like Bands
|
|
#if CFG_LMIC_EU_like
|
|
for (int i = 0; i < MAX_BANDS; i++) {
|
|
ostime_t correctedAvail =
|
|
RTC_LMIC.bands[i].avail -
|
|
((now / 1000.0 + deepsleep_sec) * OSTICKS_PER_SEC);
|
|
if (correctedAvail < 0) {
|
|
correctedAvail = 0;
|
|
}
|
|
RTC_LMIC.bands[i].avail = correctedAvail;
|
|
}
|
|
|
|
RTC_LMIC.globalDutyAvail = RTC_LMIC.globalDutyAvail -
|
|
((now / 1000.0 + deepsleep_sec) * OSTICKS_PER_SEC);
|
|
if (RTC_LMIC.globalDutyAvail < 0) {
|
|
RTC_LMIC.globalDutyAvail = 0;
|
|
}
|
|
#else
|
|
ESP_LOGW(TAG, "No DutyCycle recalculation function!");
|
|
#endif
|
|
|
|
ESP_LOGI(TAG, "LMIC state saved");
|
|
}
|
|
|
|
void LoadLMICFromRTC() {
|
|
LMIC = RTC_LMIC;
|
|
ESP_LOGI(TAG, "LMIC state loaded");
|
|
}
|
|
|
|
#endif // HAS_LORA
|