extract Dht in separate file and disable it

gateway/include/Dht.h

@@ -0,0 +1,35 @@
+#if DHT_SENSOR
+
+#include <DHT.h>
+
+#define DHT11_PIN 12
+#define READ_INTERVAL(c) (c*60*1000UL)	// read interval in minutes
+
+DHT dht = DHT(DHT11_PIN, DHT11);
+unsigned long currentTime = 0;
+
+namespace Dht {
+    void setup() {
+		dht.begin();
+    }
+
+	void read(JsonDocument& jsonDoc) {
+		currentTime = millis();
+		static unsigned long lastReadTime = 0;
+		if (currentTime > lastReadTime) {
+			lastReadTime = currentTime + READ_INTERVAL(5);
+			JsonObject dht11 = jsonDoc.createNestedObject("dht11");
+			dht11["temperature"] = dht.readTemperature();
+			dht11["humidity"] = dht.readHumidity();
+		}
+	}
+}
+#else
+namespace Dht {
+    void setup() {
+    }
+
+	void read(JsonDocument& jsonDoc) {
+	}
+}
+#endif

gateway/platformio.ini

@@ -19,4 +19,5 @@ lib_deps =
 	bblanchon/ArduinoJson@6.16.1
 	adafruit/Adafruit Unified Sensor@^1.1.4
 	adafruit/DHT sensor library@1.3.10
+build_flags = -D DHT_SENSOR=0
 upload_port = /dev/ttyUSB0

gateway/src/gateway.cpp

@@ -1,25 +1,20 @@
 #include <Arduino.h>
 #include <RCSwitch.h>
-#include <ArduinoJson.h>
 #include <Adafruit_Sensor.h>
-#include <DHT.h>
+#include <ArduinoJson.h>
 #include "Tiny.h"
+#include "Dht.h"
+
 
 #define RESET_PIN 10
 #define SEND_PIN 11
 #define RECEIVE_PIN 2
-#define DHT11_PIN 12
 
-#define READ_INTERVAL(c) (c*60*1000UL)	// read interval in minutes
-
-unsigned long currentTime = 0;
 
 RCSwitch mySwitch = RCSwitch();
-DHT dht = DHT(DHT11_PIN, DHT11);
 
 void readRcSwitch(JsonDocument& jsonDoc);
 void readCommand();
-void readDht(JsonDocument& jsonDoc);
 
 void setup() {
 	digitalWrite(RESET_PIN, HIGH);
@@ -30,7 +25,7 @@ void setup() {
 	mySwitch.enableTransmit(SEND_PIN);
 	mySwitch.setRepeatTransmit(10);
 
-	dht.begin();
+	Dht::setup();
 
 	Serial.begin(9600);
 
@@ -38,11 +33,10 @@ void setup() {
 }
 
 void loop() {
-	currentTime = millis();
 	StaticJsonDocument<200> jsonDoc;
 	readCommand();
 	readRcSwitch(jsonDoc);
-	readDht(jsonDoc);
+	Dht::read(jsonDoc);
 	if (!jsonDoc.isNull()) {
 		serializeJson(jsonDoc, Serial);
 		Serial.println();
@@ -154,13 +148,3 @@ void readCommand() {
 		runJsonCommand(cmd);
 	}
 }
-
-void readDht(JsonDocument& jsonDoc) {
-	static unsigned long lastReadTime = 0;
-	if (currentTime > lastReadTime) {
-		lastReadTime = currentTime + READ_INTERVAL(5);
-		JsonObject dht11 = jsonDoc.createNestedObject("dht11");
-		dht11["temperature"] = dht.readTemperature();
-		dht11["humidity"] = dht.readHumidity();
-	}
-}