128 lines
2.4 KiB
Arduino
128 lines
2.4 KiB
Arduino
#include "DHT.h"
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#include <ESP8266WiFi.h>
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#include <WiFiUdp.h>
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#include "config.h"
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#define DHTPIN 5
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#define DHTTYPE DHT22
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#define READ_INTERVAL 1000
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#define UDP_PORT 7000
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#define PING_INTERVAL 60000 // one minute seems to be ok for us
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WiFiUDP udp;
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DHT dht(DHTPIN, DHTTYPE);
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char id[64];
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long last_ping;
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void setup()
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{
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Serial.begin(115200);
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Serial.println("Initialised...");
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dht.begin();
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WiFi.begin(WIFI_NAME, WIFI_PASS);
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Serial.print("Connecting");
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while (WiFi.status() != WL_CONNECTED)
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{
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delay(500);
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Serial.print(".");
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}
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Serial.println();
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Serial.print("Connected, IP address: ");
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Serial.println(WiFi.localIP());
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uint8_t macAddr[6];
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WiFi.macAddress(macAddr);
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sprintf(id, "%02x:%02x:%02x:%02x:%02x:%02x", macAddr[0], macAddr[1], macAddr[2], macAddr[3], macAddr[4], macAddr[5]);
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Serial.printf("Connected, mac address: %s\n", id);
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udp.begin(UDP_PORT);
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last_ping = millis();
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}
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char payload[1024];
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void Convert(float v, char* s)
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{
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if (isnan(v))
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{
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strcpy(s, "null");
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}
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else
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{
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sprintf(s, "%.3f", v);
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}
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}
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void ReadAndSend()
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{
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float h = dht.readHumidity();
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float t = dht.readTemperature();
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char h_str[15];
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char t_str[15];
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Convert(h, h_str);
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Convert(t, t_str);
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int len = snprintf(payload, sizeof(payload), "{\"t\":%s,\"h\":%s,\"id\":\"%s\",\"ip\":\"%s\"}", t_str, h_str, id, WiFi.localIP().toString().c_str());
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Serial.print("Sending payload:\n");
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Serial.println(payload);
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if (!udp.beginPacket(REMOTE_IP, REMOTE_PORT))
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{
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Serial.println("Error with destination ip or port");
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return;
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}
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udp.write(payload, len);
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udp.endPacket();
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}
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char incoming_packet[4096];
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void ParseIncomingPacket()
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{
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int len = udp.read(incoming_packet, sizeof(incoming_packet));
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if (len == 0) return;
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// find command
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int pos = 0;
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while (pos < len && incoming_packet[pos] != 0x01) pos++;
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if (strncmp(incoming_packet, "ping", pos) == 0)
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{
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Serial.println("Ping command received");
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last_ping = millis();
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}
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else
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{
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// unknown command
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Serial.println("Unknown command received");
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}
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}
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unsigned long last_read = 0;
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void loop()
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{
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unsigned long current = millis();
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if (current < last_read || current - last_read >= READ_INTERVAL)
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{
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ReadAndSend();
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last_read = current;
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}
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int packetSize = udp.parsePacket();
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if (packetSize)
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{
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ParseIncomingPacket();
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}
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current = millis();
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if (current < last_ping || current - last_ping >= PING_INTERVAL)
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{
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// no pings for long time, reboot
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Serial.println("No pings for long time, reboot");
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ESP.restart();
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}
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}
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