Ano-sys
90 lines
1.8 KiB
Arduino
90 lines
1.8 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 DEST_ID 0xAB // receiver
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#define SELF_ID 0xAA // sender
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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(DEST_ID);
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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 waitForPacket(unsigned long timeout_ms) {
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unsigned long t0 = millis();
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while (millis() - t0 < timeout_ms) {
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if (LoRa.parsePacket()) return true;
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delay(5);
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}
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return false; // Timeout
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}
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bool getPacket(String& payload, byte& sender) {
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int size = LoRa.parsePacket();
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if (!size) return false;
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byte dest = LoRa.read();
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sender = LoRa.read();
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byte len = LoRa.read();
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if (dest != SELF_ID && dest != 0xFF) {
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LoRa.flush();
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return false;
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}
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while (LoRa.available()) payload += (char)LoRa.read();
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return (payload.length() == len);
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}
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bool waitForAck(unsigned long timeout_ms = 1000) {
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if (!waitForPacket(timeout_ms)) return false;
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String payload;
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byte snd;
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if (!getPacket(payload, snd)) return false;
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return (snd == DEST_ID && payload == "ACK");
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}
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String readGpsLine() {
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return "48.12345,11.56789";
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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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;
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LoRa.setSyncWord(SYNC_WORD);
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LoRa.enableCrc();
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}
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void loop() {
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if (waitForPacket(10)) {
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String cmd;
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byte snd;
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if (!getPacket(cmd, snd)) return;
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if (snd == DEST_ID && cmd == "g") {
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String gps = readGpsLine();
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sendMessage(gps);
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if (!waitForAck()) Serial.println("ACK fehlte!");
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}
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}
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}
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