pro-mini doesn't support map, find protocol based on each protocol's value - type safe

gateway/include/Protocol.h

@@ -2,19 +2,14 @@
 #include <ArduinoJson.h>
 #include <RCSwitch.h>
 
-using namespace std;
-
 class Protocol {
 protected:
     unsigned int no;
 
 public:
-    static unordered_map<unsigned int, Protocol*> mapProtocols;
+    constexpr Protocol(unsigned int protocol) : no(protocol) {}
 
-    Protocol(unsigned int protocol) {
-        no = protocol;
-        mapProtocols.insert({ no, this });
-    }
+    constexpr operator unsigned int() const { return no; }
 
     Protocol& setProtocol(unsigned int p) {
         no = p;
@@ -32,6 +27,4 @@ public:
         rcSwitch["protocol"] = no;
         rcSwitch["value"] = value;
     }
-};
-unordered_map<unsigned int, Protocol*> Protocol::mapProtocols;
-Protocol fallbackProtocol{ 0 };
+} fallbackProtocol{ 0 };

gateway/include/Protocol_1.h

@@ -5,7 +5,7 @@
 class Protocol_1 : public Protocol {
 
 public:
-    Protocol_1() : Protocol(1) {}
+    constexpr Protocol_1() : Protocol(1) {}
 
     void fromJson(JsonObjectConst& rcSwitch, RCSwitch& rcDevice) override {
         unsigned int protocol = rcSwitch["protocol"];
@@ -26,9 +26,12 @@ public:
         rcSwitch["raw_value"] = value;
     }
 
+#if defined(ESP8266)
     static std::string buildId(const char* group, const unsigned char channel) {
         char uId[30];
         sprintf(uId, "%s_%d", group, channel);
         return std::string{ uId };
     }
-} protocol1;
+#endif
+};
+constexpr Protocol_1 protocol1;

gateway/include/Protocol_2.h

@@ -5,7 +5,7 @@
 class Protocol_2 : public Protocol {
 
 public:
-    Protocol_2() : Protocol(2) {}
+    constexpr Protocol_2() : Protocol(2) {}
 
     void toJson(unsigned long value, JsonDocument& jsonDoc) override {
         switch (value) {
@@ -32,4 +32,5 @@ public:
         }
     }
 
-} protocol2;
+};
+constexpr Protocol_2 protocol2;

gateway/include/Protocol_Doorbell.h

@@ -8,44 +8,38 @@
 class Protocol_Doorbell : public Protocol {
 
 public:
-    Protocol_Doorbell() : Protocol(16) {}
+    constexpr Protocol_Doorbell() : Protocol(16) {}
 
-    void ring() {
+    static void ring(const char* value) {
         preamble();
         for (int i = 0; i < 7; i++) {
             delayMicroseconds(TX_DELAY);
-            code("00000000110100101000100");
+            code(value);
         }
     }
 
-    void fromJson(JsonObjectConst& rcSwitch, RCSwitch& rcDevice) override {
-    }
-
-    void toJson(unsigned long value, JsonDocument& jsonDoc) override {
-    }
-
 private:
-    void transmitBit(uint8_t value) {
+    static void transmitBit(uint8_t value) {
         digitalWrite(SEND_PIN, value);
         delayMicroseconds(BIT_LENGTH);
         digitalWrite(SEND_PIN, LOW);
     }
 
-    void transmitHigh() {
+    static void transmitHigh() {
         digitalWrite(SEND_PIN, HIGH);
         delayMicroseconds(BIT_LENGTH_3);
         digitalWrite(SEND_PIN, LOW);
         delayMicroseconds(BIT_LENGTH);
     }
 
-    void transmitLow() {
+    static void transmitLow() {
         digitalWrite(SEND_PIN, HIGH);
         delayMicroseconds(BIT_LENGTH);
         digitalWrite(SEND_PIN, LOW);
         delayMicroseconds(BIT_LENGTH_3);
     }
 
-    void preamble() {
+    static void preamble() {
         noInterrupts();
         for (int i = 0; i < 370; i++) {
             transmitBit(HIGH);
@@ -54,11 +48,12 @@ private:
         interrupts();
     }
 
-    void code(const char* value) {
+    static void code(const char* value) {
         noInterrupts();
         for (const char* p = value; *p; p++) {
             *p == '1' ? transmitHigh() : transmitLow();
         }
         interrupts();
     }
-} doorbell;
+};
+constexpr Protocol_Doorbell doorbell;

gateway/include/devices.h

@@ -109,7 +109,7 @@ Command* commands[] = {
     }).asDevice(gatewayDevice).build(),
     Builder<Button>::instance(new Button{"Front door", "doorbell_front",
         [](const char* msg) {
-            if (strcmp("PRESS", msg) == 0) doorbell.ring();
+            if (strcmp("PRESS", msg) == 0) Protocol_Doorbell::ring("00000000110100101000100");
         }
     })
     .asDevice(

gateway/src/gateway.cpp

@@ -31,9 +31,17 @@ void setup() {
 	delay(1000);
 }
 
-Protocol& findProtocol(unsigned int protocol) {
-	auto p = Protocol::mapProtocols[protocol];
-	return p ? *p : fallbackProtocol.setProtocol(protocol);
+const Protocol& findProtocol(unsigned int protocol) {
+	switch (protocol) {
+	case protocol1:
+		return protocol1;
+	case protocol2:
+		return protocol2;
+	case doorbell:
+		return doorbell;
+	default:
+		return fallbackProtocol.setProtocol(protocol);
+	}
 }
 
 void readRcSwitch() {
@@ -48,7 +56,7 @@ void readRcSwitch() {
 		mySwitch.resetAvailable();
 
 		StaticJsonDocument<128> jsonDoc;
-		Protocol& p = findProtocol(mySwitch.getReceivedProtocol());
+		auto p = findProtocol(mySwitch.getReceivedProtocol());
 		p.toJson(value, jsonDoc);
 		if (!jsonDoc.isNull()) {
 			serializeJson(jsonDoc, Serial);
@@ -75,7 +83,7 @@ void runJsonCommand(char* cmd) {
 	if (err == DeserializationError::Ok) {
 		if (jsonDoc.containsKey("rcSwitch")) {
 			JsonObjectConst rcSwitch = jsonDoc["rcSwitch"];
-			Protocol& p = findProtocol(rcSwitch["protocol"]);
+			auto p = findProtocol(rcSwitch["protocol"]);
 			p.fromJson(rcSwitch, mySwitch);
 			serializeJson(jsonDoc, Serial);
 			Serial.println();