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366 lines
11 KiB
C
366 lines
11 KiB
C
// FARM DATA RELAY SYSTEM
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//
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// "fdrs_sensor.h"
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//
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// Developed by Timm Bogner (timmbogner@gmail.com) for Sola Gratia Farm in Urbana, Illinois, USA.
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//
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#include <fdrs_datatypes.h>
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#if defined(ESP8266)
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#include <ESP8266WiFi.h>
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#include <espnow.h>
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#elif defined(ESP32)
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#include <esp_now.h>
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#include <WiFi.h>
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#include <esp_wifi.h>
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#endif
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#ifdef USE_LORA
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#include <LoRa.h>
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#endif
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// enable to get detailed info from where single configuration macros have been taken
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#define DEBUG_NODE_CONFIG
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#ifdef USE_LORA
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// select LoRa band configuration
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#if defined(LORA_BAND)
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#define FDRS_BAND LORA_BAND
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#elif defined (GLOBAL_LORA_BAND)
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#define FDRS_BAND GLOBAL_LORA_BAND
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#else
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// ASSERT("NO LORA-BAND defined! Please define in fdrs_globals.h (recommended) or in fdrs_sensor_config.h");
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#endif //LORA_BAND
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// select LoRa SF configuration
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#if defined(LORA_SF)
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#define FDRS_SF LORA_SF
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#elif defined (GLOBAL_LORA_SF)
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#define FDRS_SF GLOBAL_LORA_SF
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#else
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// ASSERT("NO LORA-SF defined! Please define in fdrs_globals.h (recommended) or in fdrs_sensor_config.h");
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#endif //LORA_SF
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#endif //USE_LORA
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#ifdef FDRS_DEBUG
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#define DBG(a) (Serial.println(a))
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#else
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#define DBG(a)
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#endif
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#define MAC_PREFIX 0xAA, 0xBB, 0xCC, 0xDD, 0xEE // Should only be changed if implementing multiple FDRS systems.
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#ifdef DEBUG_NODE_CONFIG
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#include "fdrs_checkConfig.h"
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#endif
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typedef struct __attribute__((packed)) DataReading {
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float d;
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uint16_t id;
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uint8_t t;
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} DataReading;
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enum crcResult{
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CRC_NULL,
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CRC_OK,
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CRC_BAD,
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} returnCRC;
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enum {
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cmd_clear,
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cmd_ping,
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cmd_add,
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cmd_ack,
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};
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const uint16_t espnow_size = 250 / sizeof(DataReading);
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uint8_t gatewayAddress[] = {MAC_PREFIX, GTWY_MAC};
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uint16_t gtwyAddress = ((gatewayAddress[4] << 8) | GTWY_MAC);
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uint16_t LoRaAddress = 0x4200;
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unsigned long transmitLoRaMsg = 0; // Number of total LoRa packets destined for us and of valid size
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unsigned long msgOkLoRa = 0; // Number of total LoRa packets with valid CRC
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uint32_t wait_time = 0;
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DataReading fdrsData[espnow_size];
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uint8_t data_count = 0;
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void beginFDRS() {
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#ifdef FDRS_DEBUG
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Serial.begin(115200);
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// find out the reset reason
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esp_reset_reason_t resetReason;
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resetReason = esp_reset_reason();
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#endif
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DBG("FDRS Sensor ID " + String(READING_ID) + " initializing...");
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DBG(" Gateway: " + String (GTWY_MAC, HEX));
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#ifdef POWER_CTRL
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DBG("Powering up the sensor array!");
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pinMode(POWER_CTRL, OUTPUT);
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digitalWrite(POWER_CTRL, 1);
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#endif
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// Init ESP-NOW for either ESP8266 or ESP32 and set MAC address
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#ifdef USE_ESPNOW
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DBG("Initializing ESP-NOW!");
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WiFi.mode(WIFI_STA);
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WiFi.disconnect();
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#if defined(ESP8266)
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if (esp_now_init() != 0) {
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return;
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}
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esp_now_set_self_role(ESP_NOW_ROLE_COMBO);
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// Register peers
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esp_now_add_peer(gatewayAddress, ESP_NOW_ROLE_COMBO, 0, NULL, 0);
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#elif defined(ESP32)
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if (esp_now_init() != ESP_OK) {
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DBG("Error initializing ESP-NOW");
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return;
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}
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esp_now_peer_info_t peerInfo;
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peerInfo.ifidx = WIFI_IF_STA;
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peerInfo.channel = 0;
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peerInfo.encrypt = false;
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// Register first peer
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memcpy(peerInfo.peer_addr, gatewayAddress, 6);
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if (esp_now_add_peer(&peerInfo) != ESP_OK) {
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DBG("Failed to add peer");
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return;
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}
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#endif
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DBG(" ESP-NOW Initialized.");
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#endif //USE_ESPNOW
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#ifdef USE_LORA
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DBG("Initializing LoRa!");
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#ifdef ESP32
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SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
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#endif
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LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);
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if (!LoRa.begin(FDRS_BAND)) {
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DBG("Unable to initialize LoRa!");
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while (1);
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}
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LoRa.setSpreadingFactor(FDRS_SF);
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DBG(" LoRa Initialized.");
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DBG("LoRa Band: " + String(FDRS_BAND));
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DBG("LoRa SF : " + String(FDRS_SF));
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#endif // USE_LORA
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#ifdef DEBUG_NODE_CONFIG
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if (resetReason != ESP_RST_DEEPSLEEP) {
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checkConfig();
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}
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#endif //DEBUG_NODE_CONFIG
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}
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// USED to get ACKs from LoRa gateway at this point. May be used in the future to get other data
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// Return type is crcResult struct - CRC_OK, CRC_BAD, CRC_NULL. CRC_NULL used for non-ack data
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crcResult getLoRa() {
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#ifdef USE_LORA
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int packetSize = LoRa.parsePacket();
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if ((packetSize - 6) % sizeof(SystemPacket) == 0 && packetSize > 0) { // packet size should be 6 bytes plus multiple of size of SystemPacket
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uint8_t packet[packetSize];
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uint16_t sourceMAC = 0x0000;
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uint16_t destMAC = 0x0000;
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uint16_t packetCRC = 0x0000; // CRC Extracted from received LoRa packet
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uint16_t calcCRC = 0x0000; // CRC calculated from received LoRa packet
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uint ln = (packetSize - 6) / sizeof(SystemPacket);
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SystemPacket receiveData[ln];
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LoRa.readBytes((uint8_t *)&packet, packetSize);
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destMAC = (packet[0] << 8) | packet[1];
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sourceMAC = (packet[2] << 8) | packet[3];
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packetCRC = ((packet[packetSize - 2] << 8) | packet[packetSize - 1]);
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DBG("Incoming LoRa. Size: " + String(packetSize) + " Bytes, RSSI: " + String(LoRa.packetRssi()) + "dBi, SNR: " + String(LoRa.packetSnr()) + "dB, PacketCRC: 0x" + String(packetCRC,16));
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if (destMAC == LoRaAddress) {
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//printLoraPacket(packet,sizeof(packet));
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memcpy(receiveData, &packet[4], packetSize - 6); //Split off data portion of packet (N bytes)
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if(ln == 1 && receiveData[0].cmd == cmd_ack) { // We have received an ACK packet
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if(packetCRC == 0xFFFF) {
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DBG("ACK Received - address 0x" + String(sourceMAC,16) + "(hex) does not want ACKs");
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return CRC_OK;
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}
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else {
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for(int i = 0; i < (packetSize - 2); i++) { // Last 2 bytes of packet are the CRC so do not include them in calculation
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//printf("CRC: %02X : %d\n",calcCRC, i);
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calcCRC = crc16_update(calcCRC, packet[i]);
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}
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if(calcCRC == packetCRC) {
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DBG("ACK Received - CRC Match");
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return CRC_OK;
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}
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else {
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DBG("ACK Received CRC Mismatch! Packet CRC is 0x" + String(packetCRC,16) + ", Calculated CRC is 0x" + String(calcCRC,16));
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return CRC_BAD;
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}
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}
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}
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else{ // data we have received is not of type ACK_T. How we handle is future enhancement.
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DBG("Received some LoRa SystemPacket data that is not of type ACK. To be handled in future enhancement.");
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DBG("ln: " + String(ln) + "data type: " + String(receiveData[0].cmd));
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return CRC_NULL;
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}
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}
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else if((packetSize - 6) % sizeof(DataReading) == 0) { // packet size should be 6 bytes plus multiple of size of DataReading)
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DBG("Incoming LoRa packet of " + String(packetSize) + " bytes received, with DataReading data to be processed.");
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return CRC_NULL;
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}
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else {
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DBG("Incoming LoRa packet of " + String(packetSize) + " bytes received, not destined to our address.");
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return CRC_NULL;
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}
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}
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else {
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if(packetSize != 0) {
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DBG("Incoming LoRa packet of " + String(packetSize) + " bytes received");
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}
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}
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return CRC_NULL;
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#endif
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}
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void printLoraPacket(uint8_t* p,int size) {
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printf("Printing packet of size %d.",size);
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for(int i = 0; i < size; i++ ) {
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if(i % 2 == 0) printf("\n%02d: ", i);
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printf("%02X ", p[i]);
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}
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printf("\n");
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}
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void transmitLoRa(uint16_t* destMAC, DataReading * packet, uint8_t len) {
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#ifdef USE_LORA
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uint8_t pkt[6 + (len * sizeof(DataReading))];
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uint16_t calcCRC = 0x0000;
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pkt[0] = (*destMAC >> 8);
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pkt[1] = (*destMAC & 0x00FF);
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pkt[2] = (LoRaAddress >> 8);
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pkt[3] = (LoRaAddress & 0x00FF);
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memcpy(&pkt[4], packet, len * sizeof(DataReading));
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for(int i = 0; i < (sizeof(pkt) - 2); i++) { // Last 2 bytes are CRC so do not include them in the calculation itself
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//printf("CRC: %02X : %d\n",calcCRC, i);
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calcCRC = crc16_update(calcCRC, pkt[i]);
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}
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#ifndef LORA_ACK
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calcCRC = crc16_update(calcCRC, 0xA1); // Recalculate CRC for No ACK
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#endif // LORA_ACK
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pkt[len * sizeof(DataReading) + 4] = (calcCRC >> 8);
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pkt[len * sizeof(DataReading) + 5] = (calcCRC & 0x00FF);
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#ifdef LORA_ACK // Wait for ACK
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int retries = LORA_RETRIES + 1;
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while(retries != 0) {
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if(transmitLoRaMsg != 0)
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DBG("Transmitting LoRa message of size " + String(sizeof(pkt)) + " bytes with CRC 0x" + String(calcCRC,16) + " to gateway 0x" + String(*destMAC,16) + ". Retries remaining: " + String(retries - 1) + ", CRC OK " + String((float)msgOkLoRa/transmitLoRaMsg*100) + "%");
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else
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DBG("Transmitting LoRa message of size " + String(sizeof(pkt)) + " bytes with CRC 0x" + String(calcCRC,16) + " to gateway 0x" + String(*destMAC,16) + ". Retries remaining: " + String(retries - 1));
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//printLoraPacket(pkt,sizeof(pkt));
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LoRa.beginPacket();
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LoRa.write((uint8_t*)&pkt, sizeof(pkt));
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LoRa.endPacket();
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transmitLoRaMsg++;
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unsigned long loraAckTimeout = millis() + LORA_ACK_TIMEOUT;
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retries--;
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delay(10);
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while(returnCRC == CRC_NULL && (millis() < loraAckTimeout)) {
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returnCRC = getLoRa();
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}
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if(returnCRC == CRC_OK) {
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//DBG("LoRa ACK Received! CRC OK");
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msgOkLoRa++;
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return; // we're done
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}
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else if(returnCRC == CRC_BAD) {
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//DBG("LoRa ACK Received! CRC BAD");
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// Resend original packet again if retries are available
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}
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else {
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DBG("LoRa Timeout waiting for ACK!");
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// resend original packet again if retries are available
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}
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}
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#else // Send and do not wait for ACK reply
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DBG("Transmitting LoRa message of size " + String(sizeof(pkt)) + " bytes with CRC 0x" + String(calcCRC,16) + " to gateway 0x" + String(*destMAC,16));
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//printLoraPacket(pkt,sizeof(pkt));
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LoRa.beginPacket();
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LoRa.write((uint8_t*)&pkt, sizeof(pkt));
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LoRa.endPacket();
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transmitLoRaMsg++;
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#endif // LORA_ACK
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#endif // USE_LORA
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}
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void sendFDRS() {
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DBG("Sending FDRS Packet!");
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#ifdef USE_ESPNOW
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esp_now_send(gatewayAddress, (uint8_t *) &fdrsData, data_count * sizeof(DataReading));
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delay(5);
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DBG(" ESP-NOW sent.");
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#endif
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#ifdef USE_LORA
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transmitLoRa(gtwyAddress, fdrsData, data_count);
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DBG(" LoRa sent.");
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#endif
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data_count = 0;
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returnCRC = CRC_NULL;
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}
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void loadFDRS(float d, uint8_t t) {
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DBG("Id: " + String(READING_ID) + " - Type: " + String(t) + " - Data loaded: " + String(d));
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if (data_count > espnow_size) sendFDRS();
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DataReading dr;
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dr.id = READING_ID;
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dr.t = t;
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dr.d = d;
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fdrsData[data_count] = dr;
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data_count++;
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}
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void sleepFDRS(int sleep_time) {
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DBG("Sleepytime!");
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#ifdef DEEP_SLEEP
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DBG(" Deep sleeping.");
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#ifdef ESP32
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esp_sleep_enable_timer_wakeup(sleep_time * 1000000);
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esp_deep_sleep_start();
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#endif
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#ifdef ESP8266
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ESP.deepSleep(sleep_time * 1000000);
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#endif
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#endif
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DBG(" Delaying.");
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delay(sleep_time * 1000);
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}
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// CRC16 from https://github.com/4-20ma/ModbusMaster/blob/3a05ff87677a9bdd8e027d6906dc05ca15ca8ade/src/util/crc16.h#L71
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/** @ingroup util_crc16
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Processor-independent CRC-16 calculation.
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Polynomial: x^16 + x^15 + x^2 + 1 (0xA001)<br>
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Initial value: 0xFFFF
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This CRC is normally used in disk-drive controllers.
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@param uint16_t crc (0x0000..0xFFFF)
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@param uint8_t a (0x00..0xFF)
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@return calculated CRC (0x0000..0xFFFF)
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*/
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static uint16_t crc16_update(uint16_t crc, uint8_t a)
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{
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int i;
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crc ^= a;
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for (i = 0; i < 8; ++i)
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{
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if (crc & 1)
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crc = (crc >> 1) ^ 0xA001;
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else
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crc = (crc >> 1);
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}
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return crc;
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} |