Ano-sys
102 lines
2.0 KiB
Arduino
102 lines
2.0 KiB
Arduino
#include <SPI.h>
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#include <LoRa.h>
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#define SYNC_WORD 0xCE
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#define SENDER_ID 0xAA
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#define SELF_ID 0xAB
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#define LORA_SCK 5
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#define LORA_MISO 19
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#define LORA_MOSI 27
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#define LORA_CS 18
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#define LORA_RST 23
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#define LORA_IRQ 26
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#define LORA_FREQ 868E6
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void sendMessage(const String& msg) {
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LoRa.beginPacket();
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LoRa.write(SYNC_WORD);
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LoRa.write(SELF_ID);
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LoRa.write(msg.length());
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LoRa.print(msg);
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LoRa.endPacket(true);
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}
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bool receiveMessage(String& out) {
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int packetSize = LoRa.parsePacket();
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if (!packetSize) return false;
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byte sync = LoRa.read();
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byte sender = LoRa.read();
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if (sync != SYNC_WORD || sender != SENDER_ID) {
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LoRa.flush();
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return false;
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}
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byte len = LoRa.read();
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String data;
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while (LoRa.available()) data += (char)LoRa.read();
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if (data.length() != len) {
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out = "ERR: LEN";
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return true;
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}
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sendMessage("ACK");
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out = data;
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return true;
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}
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void printHelp() {
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Serial.println("g – Standort anfragen\nh – Hilfe");
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}
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void handleCommandG(){
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sendMessage("g");
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unsigned long t0 = millis();
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String answer;
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while (millis() - t0 < 1000) {
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if (receiveMessage(answer)) {
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Serial.println(answer);
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break;
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}
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delay(10);
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}
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if (millis() - t0 >= 1000) Serial.println("Timeout");
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}
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void setup() {
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Serial.begin(115200);
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SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_CS);
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LoRa.setPins(LORA_CS, LORA_RST, LORA_IRQ);
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if (!LoRa.begin(LORA_FREQ)) {
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while (true) {
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Serial.println("Konnte LoRa nicht initialisieren!\nBitte neustarten!");
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delay(1000);
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}
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}
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LoRa.enableCrc();
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// LoRa.setSyncWord(SYNC_WORD); // this would have been simpler nevermind
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}
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void loop() {
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if (Serial.available()) {
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char cmd = Serial.read();
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switch (cmd) {
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case 'h':
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printHelp();
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break;
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case 'g':
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handleCommandG();
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break;
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default:
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printHelp();
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break;
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}
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}
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// passive listening
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String msg;
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if (receiveMessage(msg)) Serial.printf("RX: %s\n", msg.c_str());
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}
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