Some memory optimization for Arduino UNO following this thread:

https://community.openmqttgateway.com/t/arduino-uno-ethernet-shield-reboots-on-receiving-rf-signal-on-v-0-9/346/22
Rework led management to avoid use of global variables
and specify special JSON_MSG_BUFFER for arduino UNO
led can now be used for all the boards

generalize use of F macro
for memory optimization
change jsonbuffer calculation method
reduce pubsubclient max packet size for uno and nano

OpenMQTTGateway.ino

@@ -179,11 +179,6 @@ PubSubClient client(eClient);
 //MQTT last attemps reconnection date
 unsigned long lastReconnectAttempt = 0;
 
-//timers for LED indicators
-unsigned long timer_led_receive = 0;
-unsigned long timer_led_send = 0;
-unsigned long timer_led_error = 0;
-
 boolean reconnect() {
 
   // Loop until we're reconnected
@@ -314,18 +309,15 @@ void setup()
     Serial.begin(SERIAL_BAUD);
     //Begining ethernet connection in case of Arduino + W5100
     setup_ethernet();    
-    //setup LED status, turn all ON for short amount then leave only the RED LED ON
+  #endif
+
+  //setup LED status
   pinMode(led_receive, OUTPUT);
   pinMode(led_send, OUTPUT);
-    pinMode(led_error, OUTPUT);
+  pinMode(led_info, OUTPUT);
   digitalWrite(led_receive, LOW);
   digitalWrite(led_send, LOW);
-    digitalWrite(led_error, LOW);
+  digitalWrite(led_info, LOW);
-    delay(500);
-    digitalWrite(led_receive, HIGH);
-    digitalWrite(led_send, HIGH);
-    
-  #endif
 
   #if defined(MDNS_SD) && defined(ESP8266)
      trc(F("Connecting to MQTT by mDNS without mqtt hostname"));
@@ -410,8 +402,6 @@ void setup()
   
   trc(F("MQTT_MAX_PACKET_SIZE"));
   trc(MQTT_MAX_PACKET_SIZE);
-  trc(F("JSON_MSG_BUFFER"));
-  trc(JSON_MSG_BUFFER);
   trc(F("Setup OpenMQTTGateway end"));
 }
 
@@ -448,7 +438,7 @@ bool shouldSaveConfig = true;
 
 //callback notifying us of the need to save config
 void saveConfigCallback () {
-  trc("Should save config");
+  trc(F("Should save config"));
   shouldSaveConfig = true;
 }
 
@@ -456,16 +446,16 @@ void setup_wifimanager(boolean reset_settings){
     if(reset_settings)  SPIFFS.format();
 
     //read configuration from FS json
-    trc("mounting FS...");
+    trc(F("mounting FS..."));
   
     if (SPIFFS.begin()) {
-      trc("mounted file system");
+      trc(F("mounted file system"));
       if (SPIFFS.exists("/config.json")) {
         //file exists, reading and loading
-        trc("reading config file");
+        trc(F("reading config file"));
         File configFile = SPIFFS.open("/config.json", "r");
         if (configFile) {
-          trc("opened config file");
+          trc(F("opened config file"));
           size_t size = configFile.size();
           // Allocate a buffer to store contents of the file.
           std::unique_ptr<char[]> buf(new char[size]);
@@ -475,7 +465,7 @@ void setup_wifimanager(boolean reset_settings){
           JsonObject& json = jsonBuffer.parseObject(buf.get());
           json.printTo(Serial);
           if (json.success()) {
-            trc("\nparsed json");
+            trc(F("\nparsed json"));
   
             strcpy(mqtt_server, json["mqtt_server"]);
             strcpy(mqtt_port, json["mqtt_port"]);
@@ -483,12 +473,12 @@ void setup_wifimanager(boolean reset_settings){
             strcpy(mqtt_pass, json["mqtt_pass"]);
   
           } else {
-            trc("failed to load json config");
+            trc(F("failed to load json config"));
           }
         }
       }
     } else {
-      trc("failed to mount FS");
+      trc(F("failed to mount FS"));
     }
   
     // The extra parameters to be configured (can be either global or just in the setup)
@@ -525,7 +515,7 @@ void setup_wifimanager(boolean reset_settings){
     //if it does not connect it starts an access point with the specified name
     //and goes into a blocking loop awaiting configuration
     if (!wifiManager.autoConnect(WifiManager_ssid, WifiManager_password)) {
-      trc("failed to connect and hit timeout");
+      trc(F("failed to connect and hit timeout"));
       delay(3000);
       //reset and try again, or maybe put it to deep sleep
       ESP.reset();
@@ -533,7 +523,7 @@ void setup_wifimanager(boolean reset_settings){
     }
   
     //if you get here you have connected to the WiFi
-    trc("connected...yeey :)");
+    trc(F("connected...yeey :)"));
   
     //read updated parameters
     strcpy(mqtt_server, custom_mqtt_server.getValue());
@@ -543,7 +533,7 @@ void setup_wifimanager(boolean reset_settings){
   
     //save the custom parameters to FS
     if (shouldSaveConfig) {
-      trc("saving config");
+      trc(F("saving config"));
       DynamicJsonBuffer jsonBuffer;
       JsonObject& json = jsonBuffer.createObject();
       json["mqtt_server"] = mqtt_server;
@@ -553,7 +543,7 @@ void setup_wifimanager(boolean reset_settings){
     
       File configFile = SPIFFS.open("/config.json", "w");
       if (!configFile) {
-        trc("failed to open config file for writing");
+        trc(F("failed to open config file for writing"));
       }
   
       json.printTo(Serial);
@@ -594,7 +584,7 @@ void setup_ethernet() {
         trc(F("no services found"));
     }else {
         trc(n);
-        trc(" service(s) found");
+        trc(F(" service(s) found"));
         for (int i=0; i < n; ++i) {
             // Print details for each service found
             trc(i + 1);
@@ -614,13 +604,14 @@ void setup_ethernet() {
 
 void loop()
 {
+  digitalWrite(led_receive, LOW);
+  digitalWrite(led_info, LOW);
+  digitalWrite(led_send, LOW);
+  
   unsigned long now = millis();
   //MQTT client connexion management
   if (!client.connected()) { // not connected
 
-    //RED ON
-    digitalWrite(led_error, LOW);
-
     if (now - lastReconnectAttempt > 5000) {
       lastReconnectAttempt = now;
       // Attempt to reconnect
@@ -630,12 +621,6 @@ void loop()
     }
   } else { //connected
     // MQTT loop
-    //RED OFF
-    if (now - timer_led_receive > 300) {
-      timer_led_receive = now;
-      digitalWrite(led_receive, HIGH);
-    }
-    digitalWrite(led_error, HIGH);
     connectedOnce = true;
     client.loop();
 
@@ -717,28 +702,29 @@ void stateMeasures(){
     unsigned long now = millis();
     if (now > (timer_sys_measures + TimeBetweenReadingSYS)) {//retriving value of memory ram every TimeBetweenReadingSYS
       timer_sys_measures = millis();
-      StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+      const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+      StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
       JsonObject& SYSdata = jsonBuffer.createObject();
-      trc("Uptime (s)");    
+      trc(F("Uptime (s)"));    
       unsigned long uptime = millis()/1000;
       trc(uptime);
       SYSdata["uptime"] = uptime;
       #if defined(ESP8266) || defined(ESP32)
-        trc("Remaining memory");
+        trc(F("Remaining memory"));
         uint32_t freeMem;
         freeMem = ESP.getFreeHeap();
         SYSdata["freeMem"] = freeMem;
         trc(freeMem);
-        trc("RSSI");
+        trc(F("RSSI"));
         long rssi = WiFi.RSSI();
         SYSdata["rssi"] = rssi;
         trc(rssi);
-        trc("SSID");
+        trc(F("SSID"));
         String SSID = WiFi.SSID();
         SYSdata["SSID"] = SSID;
         trc(SSID);
       #endif
-      trc("Activated modules");
+      trc(F("Activated modules"));
       String modules = "";
       #ifdef ZgatewayRF
           modules = modules + ZgatewayRF;
@@ -859,10 +845,10 @@ return false;
 void receivingMQTT(char * topicOri, char * datacallback) {
   if (strstr(topicOri, subjectMultiGTWKey) != NULL) // storing received value so as to avoid publishing this value if it has been already sent by this or another OpenMQTTGateway
   {
-    trc(F("Storing signal"));
+    trc(F("Store signal"));
     unsigned long data = 0;
     #ifdef jsonPublishing
-      trc(F("Creating Json buffer"));
+      trc(F("Json buf."));
       StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
       JsonObject& jsondata = jsonBuffer.parseObject(datacallback);
       if (jsondata.success())  data =  jsondata["value"];
@@ -874,11 +860,9 @@ void receivingMQTT(char * topicOri, char * datacallback) {
     
     if (data != 0) {
       storeValue(data);
-      trc(F("Data from JSON stored"));
+      trc(F("Data JSON stored"));
     }
   }
-  //YELLOW ON
-  digitalWrite(led_send, LOW);
 
   StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
   JsonObject& jsondata = jsonBuffer.parseObject(datacallback);
@@ -916,6 +900,7 @@ void receivingMQTT(char * topicOri, char * datacallback) {
     #ifdef ZactuatorONOFF // outside the jsonpublishing macro due to the fact that we need to use simplepublishing with HA discovery
       MQTTtoONOFF(topicOri, jsondata);
     #endif
+    digitalWrite(led_send, HIGH);
   } else { // not a json object --> simple decoding
    #ifdef simpleReceiving
       #ifdef ZgatewayLORA
@@ -946,6 +931,7 @@ void receivingMQTT(char * topicOri, char * datacallback) {
   #ifdef ZactuatorONOFF
     MQTTtoONOFF(topicOri, datacallback);
   #endif
+  digitalWrite(led_send, HIGH);
   }
 //YELLOW OFF
 digitalWrite(led_send, HIGH);
@@ -997,6 +983,7 @@ bool to_bool(String const& s) { // thanks Chris Jester-Young from stackoverflow
 void trc(String msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1006,6 +993,7 @@ void trc(String msg){
 void trc(int msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1015,6 +1003,7 @@ void trc(int msg){
 void trc(unsigned int msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1024,6 +1013,7 @@ void trc(unsigned int msg){
 void trc(long msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1033,6 +1023,7 @@ void trc(long msg){
 void trc(unsigned long msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1042,6 +1033,7 @@ void trc(unsigned long msg){
 void trc(double msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1051,6 +1043,7 @@ void trc(double msg){
 void trc(float msg){
   #ifdef TRACE
     Serial.println(msg);
+    digitalWrite(led_info, HIGH);
   #endif
   #ifdef subjectTRACEtoMQTT
     pub(subjectTRACEtoMQTT,msg);
@@ -1063,6 +1056,8 @@ void pub(char * topic, char * payload, boolean retainFlag){
 
 void pub(char * topicori, JsonObject& data){
   
+    digitalWrite(led_receive, HIGH);
+    
     String topic = topicori;
     #ifdef valueAsASubject
       unsigned long value = data["value"];
@@ -1110,6 +1105,7 @@ void pub(char * topicori, JsonObject& data){
         }
       }
     #endif
+
 }
 
 void pub(char * topic, char * payload){

User_config.h

@@ -26,7 +26,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 /*-------------------VERSION----------------------*/
-#define OMG_VERSION "0.9"
+#define OMG_VERSION "0.9.1beta"
 
 /*-------------CONFIGURE WIFIMANAGER-------------(only ESP8266 & SONOFF RFBridge)*/
 /*
@@ -137,9 +137,23 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
 #define ota_port 8266
 
 /*-------------DEFINE PINs FOR STATUS LEDs----------------*/
-#define led_receive 40
+#ifdef ESP8266
-#define led_send 42
+  #define led_receive 40
-#define led_error 44
+  #define led_send 42
+  #define led_info 44
+#elif ESP32
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#elif __AVR_ATmega2560__ //arduino mega
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#else //arduino uno/nano
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#endif
 
 //      VCC   ------------D|-----------/\/\/\/\ -----------------  Arduino PIN
 //                        LED       Resistor 270-510R
@@ -166,7 +180,11 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
   #define multiCore //comment to don't use multicore function of ESP32 for BLE
 #endif
 
-#define JSON_MSG_BUFFER 512 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#if defined(ESP8266) || defined(ESP32) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
+  #define JSON_MSG_BUFFER 512 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#else // boards with smaller memory
+  #define JSON_MSG_BUFFER 64 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#endif
 
 #define TimeBetweenReadingSYS 120000 // time between system readings (like memory)
 #define subjectSYStoMQTT  Base_Topic Gateway_Name "/SYStoMQTT"

Zgateway2G.ino

@@ -47,22 +47,22 @@ void setup2G(){
 }
 
 void setupGSM(boolean deleteSMS){
-    trc("Init 2G module: ");
+    trc(F("Init 2G module: "));
     trc(_2G_PWR_PIN);
     delay(1000);
     // Power-cycle the module to reset it.
     A6l.powerCycle(_2G_PWR_PIN);
-    trc("waiting for network connection");
+    trc(F("waiting for network connection"));
     A6l.blockUntilReady(_2G_MODULE_BAUDRATE);
-    trc("A6/A7 gsm ready");
+    trc(F("A6/A7 gsm ready"));
     signalStrengthAnalysis();
     delay(1000);
     // deleting all sms
     if (deleteSMS){
       if (A6l.deleteSMS(1,4) == A6_OK ) {
-        trc("delete SMS OK");
+        trc(F("delete SMS OK"));
       }else{
-        trc("delete SMS KO");
+        trc(F("delete SMS KO"));
       }
     }
 }
@@ -70,10 +70,10 @@ void setupGSM(boolean deleteSMS){
 void signalStrengthAnalysis(){
     int signalStrength = 0;
     signalStrength = A6l.getSignalStrength();
-    trc("Signal strength: ");
+    trc(F("Signal strength: "));
     trc(signalStrength);
     if (signalStrength < _2G_MIN_SIGNAL || signalStrength > _2G_MAX_SIGNAL ) {
-      trc("Signal too low restart the module");
+      trc(F("Signal too low restart the module"));
       setupGSM(false); // if we are below or above a threshold signal we relaunch the setup of GSM module
     }
 }
@@ -82,10 +82,11 @@ boolean _2GtoMQTT(){
     // Get the memory locations of unread SMS messages.
     unreadSMSNum = A6l.getUnreadSMSLocs(unreadSMSLocs, 512);
     trc(F("Creating SMS  buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& SMSdata = jsonBuffer.createObject();
     for (int i = 0; i < unreadSMSNum; i++) {
-        trc("New  message at index: ");
+        trc(F("New  message at index: "));
         trc(unreadSMSNum);
         sms = A6l.readSMS(unreadSMSLocs[i]);
         SMSdata.set("message", (char *)sms.message.c_str());
@@ -117,11 +118,11 @@ boolean _2GtoMQTT(){
         trc(F("MQTTto2G sms"));
         trc(data);
         if (A6l.sendSMS(phone_number,data) == A6_OK ) {
-          trc("SMS OK");
+          trc(F("SMS OK"));
           // Acknowledgement to the GTW2G topic
           pub(subjectGTW2GtoMQTT, datacallback);// we acknowledge the sending by publishing the value to an acknowledgement topic, for the moment even if it is a signal repetition we acknowledge also
         }else{
-          trc("SMS KO");
+          trc(F("SMS KO"));
           // Acknowledgement to the GTW2G topic
           pub(subjectGTW2GtoMQTT, "SMS KO");// we acknowledge the sending by publishing the value to an acknowledgement topic, for the moment even if it is a signal repetition we acknowledge also
         }
@@ -143,11 +144,11 @@ boolean _2GtoMQTT(){
         trc(F("MQTTto2G sms & phone ok"));
         trc(sms);
         if (A6l.sendSMS(String(phone),String(sms)) == A6_OK ) {
-          trc("SMS OK");
+          trc(F("SMS OK"));
           // Acknowledgement to the GTW2G topic
           pub(subjectGTW2GtoMQTT, SMSdata);// we acknowledge the sending by publishing the value to an acknowledgement topic, for the moment even if it is a signal repetition we acknowledge also
         }else{
-          trc("SMS KO");
+          trc(F("SMS KO"));
           pub(subjectGTW2GtoMQTT, "SMS KO");// we acknowledge the sending by publishing the value to an acknowledgement topic, for the moment even if it is a signal repetition we acknowledge also
         }
       }else{

ZgatewayBT.ino

@@ -53,7 +53,8 @@ Thanks to wolass https://github.com/wolass for suggesting me HM 10 and dinosd ht
     class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
           void onResult(BLEAdvertisedDevice advertisedDevice) {
             trc(F("Creating BLE buffer"));
-            StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+            const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(6);
+            StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
             JsonObject& BLEdata = jsonBuffer.createObject();
             String mac_adress = advertisedDevice.getAddress().toString().c_str();
             BLEdata.set("id", (char *)mac_adress.c_str());
@@ -247,7 +248,8 @@ Thanks to wolass https://github.com/wolass for suggesting me HM 10 and dinosd ht
                 if((strlen(d[0].extract)) == 12) // if a mac adress is detected we publish it
                 {
                   trc(F("Creating BLE buffer"));
-                  StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+                  const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
+                  StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
                   JsonObject& BLEdata = jsonBuffer.createObject();
                   #ifdef subjectHomePresence
                     String HomePresenceId;

ZgatewayIR.ino

@@ -94,7 +94,8 @@ void IRtoMQTT(){
   
   if (irrecv.decode(&results)){
   trc(F("Creating IR buffer"));
-  StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+  const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+  StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
   JsonObject& IRdata = jsonBuffer.createObject();
   
   trc(F("Rcv. IR"));
@@ -107,10 +108,6 @@ void IRtoMQTT(){
     IRdata.set("protocol", (int)(results.decode_type));
     IRdata.set("bits",(int)(results.bits));
     
-    trc(F("LED MNG"));
-    digitalWrite(led_receive, LOW);
-    timer_led_receive = millis();
-    
     String rawCode = "";
     // Dump data
     for (uint16_t i = 1;  i < results.rawlen;  i++) {
@@ -179,7 +176,7 @@ void IRtoMQTT(){
     }
     #ifdef IR_GC
     else if(strstr(topicOri, "IR_GC") != NULL){ // sending GC data from https://irdb.globalcache.com
-      trc("IR_GC");
+      trc(F("IR_GC"));
       //buffer allocation from char datacallback
       uint16_t  GC[count+1];
       String value = "";
@@ -202,7 +199,7 @@ void IRtoMQTT(){
     #endif
     #ifdef IR_Raw
     else if(strstr(topicOri, "IR_Raw") != NULL){ // sending Raw data
-      trc("IR_Raw");
+      trc(F("IR_Raw"));
       //buffer allocation from char datacallback
       #ifdef ESP8266
         uint16_t  Raw[count+1];
@@ -279,9 +276,9 @@ void IRtoMQTT(){
       if (data != 0||raw) {
         trc(F("MQTTtoIR data || raw ok"));
         boolean signalSent = false;
-        trc("value");
+        trc(F("value"));
         trc(data);
-        trc("raw");
+        trc(F("raw"));
         trc(raw);
         const char * protocol_name = IRdata["protocol_name"];
         unsigned int valueBITS  = IRdata["bits"];
@@ -299,7 +296,7 @@ void IRtoMQTT(){
             }
             #ifdef IR_GC
              if(strstr(protocol_name, "IR_GC") != NULL){ // sending GC data from https://irdb.globalcache.com
-              trc("IR_GC");
+              trc(F("IR_GC"));
               //buffer allocation from char datacallback
               uint16_t  GC[count+1];
               String value = "";
@@ -322,7 +319,7 @@ void IRtoMQTT(){
             #endif
             #ifdef IR_Raw
             if(strstr(protocol_name, "IR_Raw") != NULL){ // sending Raw data
-              trc("IR_Raw");
+              trc(F("IR_Raw"));
               //buffer allocation from char datacallback
               #ifdef ESP8266
                 uint16_t  Raw[count+1];

ZgatewayLORA.ino

@@ -36,7 +36,7 @@ void setupLORA() {
   LoRa.setPins(LORA_SS,LORA_RST,LORA_DI0);  
   
   if (!LoRa.begin(LORA_BAND)) {
-    trc("ZgatewayLORA setup failed!");
+    trc(F("ZgatewayLORA setup failed!"));
     while (1);
   }
   LoRa.receive();
@@ -59,7 +59,8 @@ void setupLORA() {
 void LORAtoMQTT(){
   int packetSize = LoRa.parsePacket();
   if (packetSize) {
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(5);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& LORAdata = jsonBuffer.createObject();
     trc(F("Rcv. LORA"));
     #ifdef ESP32

ZgatewayRF.ino

@@ -47,7 +47,8 @@ void setupRF(){
 void RFtoMQTT(){
 
   if (mySwitch.available()){
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& RFdata = jsonBuffer.createObject();
     trc(F("Rcv. RF"));
     #ifdef ESP32
@@ -61,10 +62,6 @@ void RFtoMQTT(){
     RFdata.set("delay", (int)mySwitch.getReceivedDelay());
     mySwitch.resetAvailable();
     
-    trc(F("LED MNG"));
-    digitalWrite(led_receive, LOW);
-    timer_led_receive = millis();
-    
     unsigned long MQTTvalue = RFdata.get<unsigned long>("value");
     if (!isAduplicate(MQTTvalue) && MQTTvalue!=0) {// conditions to avoid duplications of RF -->MQTT
         #ifdef ZmqttDiscovery //component creation for HA

ZgatewayRF2.ino

@@ -68,7 +68,8 @@ void RF2toMQTT(){
 
   if(rf2rd.hasNewData){
     trc(F("Creating RF2 buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& RF2data = jsonBuffer.createObject();
     
     rf2rd.hasNewData = false;
@@ -80,10 +81,6 @@ void RF2toMQTT(){
     RF2data.set("address", (unsigned long)rf2rd.address);
     RF2data.set("switchType", (int)rf2rd.switchType);
     
-    trc(F("LED MNG"));
-    digitalWrite(led_receive, LOW);
-    timer_led_receive = millis();
-    
     trc(F("Adv data RF2toMQTT"));
     pub(subjectRF2toMQTT,RF2data);  
   }

ZgatewayRF315.ino

@@ -47,7 +47,8 @@ void setupRF315(){
 boolean RF315toMQTT(){
   if (mySwitch315.available()){
     trc(F("Creating RF315 buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& RF315data = jsonBuffer.createObject();
     trc(F("Rcv. RF315"));
     #ifdef ESP32
@@ -61,10 +62,6 @@ boolean RF315toMQTT(){
     RF315data.set("delay", (int)mySwitch315.getReceivedDelay());
     mySwitch315.resetAvailable();
     
-    trc(F("LED MNG"));
-    digitalWrite(led_receive, LOW);
-    timer_led_receive = millis();
-    
     unsigned long MQTTvalue = RF315data.get<unsigned long>("value");
     if (!isAduplicate(MQTTvalue) && MQTTvalue!=0) {// conditions to avoid duplications of RF -->MQTT
         trc(F("Adv data RF315toMQTT")); 

ZgatewayRFM69.ino

@@ -71,7 +71,7 @@ void eeprom_setup() {
   pGC = (struct _GLOBAL_CONFIG *)EEPROM.getDataPtr();
   // if checksum bad init GC else use GC values
   if (gc_checksum() != pGC->checksum) {
-    trc("Factory reset");
+    trc(F("Factory reset"));
     memset(pGC, 0, sizeof(*pGC));
     strcpy_P(pGC->encryptkey, ENCRYPTKEY);
     strcpy_P(pGC->rfmapname, RFM69AP_NAME);
@@ -134,7 +134,7 @@ void setupRFM69(void) {
   size_t len = snprintf_P(RadioConfig, sizeof(RadioConfig), JSONtemplate,
       freq, GC_IS_RFM69HCW, pGC->networkid, GC_POWER_LEVEL);
   if (len >= sizeof(RadioConfig)) {
-    trc("\n\n*** RFM69 config truncated ***\n");
+    trc(F("\n\n*** RFM69 config truncated ***\n"));
   }
 }
 
@@ -143,7 +143,8 @@ boolean RFM69toMQTT(void) {
   if (radio.receiveDone())
   {
     trc(F("Creating RFM69 buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& RFM69data = jsonBuffer.createObject();
     uint8_t data[RF69_MAX_DATA_LEN+1]; // For the null character
     uint8_t SENDERID = radio.SENDERID;

ZgatewaySRFB.ino

@@ -55,7 +55,7 @@ void _rfbSend(byte * message, int times) {
 
     char buffer[RF_MESSAGE_SIZE];
     _rfbToChar(message, buffer);
-    trc("[RFBRIDGE] Sending MESSAGE '%s' %d time(s)\n");
+    trc(F("[RFBRIDGE] Sending MESSAGE '%s' %d time(s)\n"));
 
     for (int i=0; i<times; i++) {
         if (i>0) {
@@ -103,7 +103,8 @@ void _rfbDecode() {
         _rfbToChar(&_uartbuf[1], buffer);
 
         trc(F("Creating SRFB buffer"));
-        StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+        StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
         JsonObject& SRFBdata = jsonBuffer.createObject();
         SRFBdata.set("raw", (char *)buffer);
         
@@ -139,7 +140,7 @@ void _rfbDecode() {
 }
 
 void _rfbAck() {
-    trc("[RFBRIDGE] Sending ACK\n");
+    trc(F("[RFBRIDGE] Sending ACK\n"));
     Serial.println();
     Serial.write(RF_CODE_START);
     Serial.write(RF_CODE_ACK);

ZmqttDiscovery.ino

@@ -358,7 +358,8 @@ void createDiscovery(char * sensor_type,
                      bool optimistic, bool retain, int off_delay,
                      char * payload_available, char * payload_not_avalaible, boolean child_device , char * command_topic)
 {
-  StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+  const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(14) + JSON_OBJECT_SIZE(4);
+  StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
   JsonObject &sensor = jsonBuffer.createObject();
   sensor.set("stat_t", state_topic); //state_topic
   sensor.set("name", s_name);          //name
@@ -385,7 +386,8 @@ void createDiscovery(char * sensor_type,
 
 
   if (child_device){
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonDeviceBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4) + JSON_ARRAY_SIZE(1);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonDeviceBuffer;
     JsonObject &device = jsonDeviceBuffer.createObject();
     device.set("name", Gateway_Name);
     device.set("manufacturer", DEVICEMANUFACTURER);

ZsensorADC.ino

@@ -48,7 +48,8 @@ void MeasureADC(){
     }else{
       if(val  >= persistedadc + ThresholdReadingADC || val  <= persistedadc - ThresholdReadingADC){
         trc(F("Creating ADC buffer"));
-        StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
+        StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
         JsonObject& ADCdata = jsonBuffer.createObject();
         ADCdata.set("adc", (int)val);
         pub(ADCTOPIC,ADCdata);

ZsensorBH1750.ino

@@ -55,7 +55,8 @@ void MeasureLightIntensity()
 {
   if (millis() > (timebh1750 + TimeBetweenReadingBH1750)) {//retriving value of Lux, FtCd and Wattsm2 from BH1750
     trc(F("Creating BH1750 buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& BH1750data = jsonBuffer.createObject();
     
     timebh1750 = millis();

ZsensorBME280.ino

@@ -129,7 +129,8 @@ void MeasureTempHumAndPressure()
       trc(F("Failed to read from Weather Sensor BME280!"));
     }else{
         trc(F("Creating BME280 buffer"));
-        StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(6);
+        StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
         JsonObject& BME280data = jsonBuffer.createObject();
       // Generate Temperature in degrees C
       if(BmeTempC != persisted_bme_tempc || bme280_always){

ZsensorDHT.ino

@@ -49,7 +49,8 @@ void MeasureTempAndHum(){
       trc(F("Failed to read from DHT sensor!"));
     }else{
       trc(F("Creating DHT buffer"));
-      StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+      const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(2);
+      StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
       JsonObject& DHTdata = jsonBuffer.createObject();
       if(h != persistedh || dht_always){
         DHTdata.set("hum", (float)h);

ZsensorGPIOInput.ino

@@ -61,7 +61,8 @@ void MeasureGPIOInput(){
     if (reading != InputState) {
       InputState = reading;
       trc(F("Creating GPIOInput buffer"));
-      StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+      const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
+      StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
       JsonObject& GPIOdata = jsonBuffer.createObject();
       if (InputState == HIGH) {
         trc(F("GPIO HIGH"));

ZsensorHCSR501.ino

@@ -35,7 +35,8 @@ void setupHCSR501() {
 void MeasureHCSR501(){
   if (millis() > TimeBeforeStartHCSR501) {//let time to init the PIR sensor
   trc(F("Creating HCSR501 buffer"));
-  StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(1);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
   JsonObject& HCSR501data = jsonBuffer.createObject();
   static int pirState = LOW;
   int PresenceValue = digitalRead(HCSR501_PIN);

ZsensorINA226.ino

@@ -52,7 +52,8 @@ void MeasureINA226(){
     if (millis() > (timeINA226 + TimeBetweenReadingINA226)) {//retriving value of temperature and humidity of the box from DHT every xUL
         timeINA226 = millis();
         trc(F("Creating INA226 buffer"));
-        StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+        const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
+        StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
         JsonObject& INA226data = jsonBuffer.createObject();
         // Topic on which we will send data
         trc(F("Retrieving electrical data"));

ZsensorTSL2561.ino

@@ -50,15 +50,15 @@ void displaySensorDetails(void)
 {
   sensor_t sensor;
   tsl.getSensor(&sensor);
-  trc("------------------------------------");
+  trc(F("------------------------------------"));
   trc("Sensor:       " + String(sensor.name));
   trc("Driver Ver:   " + String(sensor.version));
   trc("Unique ID:    " + String(sensor.sensor_id));
   trc("Max Value:    " + String(sensor.max_value) + " lux");
   trc("Min Value:    " + String(sensor.min_value) + " lux");
   trc("Resolution:   " + String(sensor.resolution) + " lux");
-  trc("------------------------------------");
+  trc(F("------------------------------------"));
-  trc("");
+  trc(F(""));
   delay(500);
 }
 
@@ -69,7 +69,7 @@ void setupZsensorTSL2561()
 
   if (!tsl.begin())
   {
-    trc("No TSL2561 detected");
+    trc(F("No TSL2561 detected"));
   }
   
   // enable auto ranging
@@ -81,7 +81,7 @@ void setupZsensorTSL2561()
   // tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_101MS);  /* medium resolution and speed   */
   tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_402MS);
 
-  trc("TSL2561 Initialized. Printing detials now.");
+  trc(F("TSL2561 Initialized. Printing detials now."));
   displaySensorDetails();  
 }
 
@@ -92,7 +92,8 @@ void MeasureLightIntensityTSL2561()
     timetsl2561 = millis();
 
     trc(F("Creating TSL2561 buffer"));
-    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(4);
+    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
     JsonObject& TSL2561data = jsonBuffer.createObject();
     
     sensors_event_t event;
@@ -109,10 +110,10 @@ void MeasureLightIntensityTSL2561()
 
     pub(subjectTSL12561toMQTT,TSL2561data);
 	} else {
-	  trc("Same lux value, do not send");
+	  trc(F("Same lux value, do not send"));
 	}
       } else {
-      trc("Failed to read from TSL2561");
+      trc(F("Failed to read from TSL2561"));
     }
   }
 }

lib/pubsubclient/src/PubSubClient.h

@@ -26,7 +26,7 @@
 	#if defined(ESP8266) || defined(ESP32) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
 	  #define MQTT_MAX_PACKET_SIZE 1024
 	#else // boards with smaller memory
-	  #define MQTT_MAX_PACKET_SIZE 256
+	  #define MQTT_MAX_PACKET_SIZE 128
 	#endif
 #endif
 

tests/Test_config.h

@@ -100,9 +100,23 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
 #define ota_password "OTAPASSWORD"
 #define ota_port 8266
 /*-------------DEFINE PINs FOR STATUS LEDs----------------*/
-#define led_receive 40
+#ifdef ESP8266
-#define led_send 42
+  #define led_receive 40
-#define led_error 44
+  #define led_send 42
+  #define led_info 44
+#elif ESP32
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#elif __AVR_ATmega2560__ //arduino mega
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#else //arduino uno/nano
+  #define led_receive 40
+  #define led_send 42
+  #define led_info 44
+#endif
 
 //      VCC   ------------D|-----------/\/\/\/\ -----------------  Arduino PIN
 //                        LED       Resistor 270-510R
@@ -220,8 +234,11 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
 #ifdef ESP32
   //#define multiCore //uncomment to use multicore function of ESP32 for BLE
 #endif
-#define JSON_MSG_BUFFER 256 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#if defined(ESP8266) || defined(ESP32) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
-
+  #define JSON_MSG_BUFFER 512 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#else // boards with smaller memory
+  #define JSON_MSG_BUFFER 64 // Json message max buffer size, don't put 1024 or higher it is causing unexpected behaviour on ESP8266
+#endif
 #define TimeBetweenReadingSYS 30000 // time between system readings (like memory)
 #define subjectSYStoMQTT  Base_Topic Gateway_Name "/SYStoMQTT"
 /*-------------------ACTIVATE TRACES----------------------*/