Function Multiple,&nbsp; Nodemcu Offline , Online , JSON Data, ESP Wifi Camera , LeaningRead All String from Serial Read All String from Serialwhile (Serial.available()) {&nbsp; &nbsp; delay(2);&nbsp; //delay to allow byte to arrive in input buffer&nbsp; &nbsp; char c = Serial.read();&nbsp; &nbsp; readString += c;&nbsp; } &nbsp; if (readString.length() &gt;0) {&nbsp; &nbsp; Serial.println(readString); &nbsp; &nbsp; readString="";&nbsp; }&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nodemcu to Arduino//Send&nbsp;#include &lt;SoftwareSerial.h&gt;&nbsp;SoftwareSerial espSerial(0, 1);String str;int val=1;void setup(){Serial.begin(115200);espSerial.begin(115200);delay(2000);}void loop(){&nbsp;str =String("coming from ESP8266: " + val ) ;Serial.println(str);espSerial.println(str);delay(1000);} //ReceivedreadString="%%11%22%3%4%5%6%7%8%9%10"; &nbsp; del = readString.indexOf("%");&nbsp; del_1 = readString.indexOf("%", del + 1);&nbsp;&nbsp; del_2 = readString.indexOf("%", del_1 +1);&nbsp; del_3 = readString.indexOf("%", del_2 +1);&nbsp; del_4 = readString.indexOf("%", del_3 +1);&nbsp;&nbsp;&nbsp; uv1 = readString.substring(del_1 + 1, del_2) ;&nbsp;&nbsp; uv2 = readString.substring(del_2 + 1, del_3) ;&nbsp;&nbsp; uv3 = readString.substring(del_3 + 1, del_4) ;&nbsp; &nbsp; &nbsp; Serial.println(uv1);&nbsp; &nbsp; Serial.println(uv2);&nbsp; &nbsp; Serial.println(uv3); &nbsp;ESP Wifi Camera&nbsp;https://www.youtube.com/watch?v=vPcJ5HOVSRQ&nbsp;https://www.youtube.com/watch?v=U7qbehy9aDo&amp;t=144s&nbsp;&nbsp;&nbsp;&nbsp;LearningNRf24l01 wiring diagram Need&nbsp; Capacitor&nbsp; 10v-100v 100uf Function void ledFunction(uint8_t st, int x){//&nbsp; &nbsp;digitalWrite(st, HIGH); //On//&nbsp; &nbsp; delay(1000);&nbsp; &nbsp;for(i = 0; i &lt; x; i += 1)&nbsp;&nbsp; &nbsp; {&nbsp; &nbsp; digitalWrite(st, HIGH); //On&nbsp; &nbsp; delay(1000);&nbsp; &nbsp; digitalWrite(st, LOW); //Off&nbsp; &nbsp; delay(1000);&nbsp; &nbsp; }&nbsp;&nbsp;&nbsp; &nbsp;digitalWrite(st, HIGH); //On&nbsp; &nbsp; delay(6000);} Offline Online ------------JSON Data#include &lt;SoftwareSerial.h&gt;#include &lt;ArduinoJson.h&gt;SoftwareSerial nodemcu(8,9); //RX,TX int minTrig=1;int i;String datas; int LDRSensor = 2;&nbsp;&nbsp;void setup() {&nbsp; // initialize serial communication at 9600 bits per second:&nbsp; &nbsp;pinMode (LDRSensor, INPUT);&nbsp; Serial.begin(9600);nodemcu.begin(9600);} // the loop routine runs over and over again forever:void loop() {datas ="";static const uint8_t digital_pins[] = {13,12,11,10,24,26,7,6,5,4,3,2,14,15,16,17,18,19,20,21,22};// Setup pins for inputfor (int i = 0; i &lt; 21; i++) { //or i &lt;= 4&nbsp;//Serial.println(digitalRead(digital_pins[i]));datas = datas + digitalRead(digital_pins[i]);}&nbsp; &nbsp;Serial.println(datas);//&nbsp; Serial.print(s1);//&nbsp; Serial.print(s2);//&nbsp; Serial.print(s3);//&nbsp; Serial.print(s4);//&nbsp; Serial.print(s5); &nbsp; StaticJsonDocument&lt;1000&gt; doc;&nbsp;&nbsp;&nbsp;&nbsp; doc["val"] =datas ;&nbsp; serializeJson(doc,nodemcu);&nbsp; delay(5000);&nbsp; // delay in between reads for stability} -----------------MEDBOX#include &lt;SoftwareSerial.h&gt;#include &lt;ESP8266WiFi.h&gt;#include &lt;ESP8266HTTPClient.h&gt;#include &lt;WiFiClientSecure.h&gt;&nbsp; #include &lt;Wire.h&gt;#include &lt;LiquidCrystal_I2C.h&gt;&nbsp;LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);&nbsp; //D4 =SDA D3=SCL #include &lt;ArduinoJson.h&gt;&nbsp;SoftwareSerial nodemcu(D2,D1); //const String ssid = "connect_virus";//const String password = "imBlessed@01"; const String ssid = "Ginora2.4G";const String password = "ger@ldGG32;;;;";String url = "https://phsite.tech/smartmedbox/save-data.php?id=1&amp;r=";String getUrl = "https://phsite.tech/smartmedbox/get-data.php?id=1&amp;uid=3";&nbsp; //Declare&nbsp;&nbsp;#define relay D7&nbsp; //D7#define ledPin1&nbsp; D5&nbsp;&nbsp;#define ledPin2&nbsp; D6&nbsp; //&nbsp; &nbsp;#define buzzer&nbsp; D0&nbsp; //&nbsp; &nbsp;&nbsp; int i;int del, del_1, del_2, del_3,del_4,del_5,del_6; //delimiterString ldrValue,msg ,day,xname,box,xtime, tim,rel,str,timeNow;String payload="%0%0%0%0%0%"; &nbsp; void setup(){&nbsp; Wire.begin(2,0);&nbsp; lcd.init();&nbsp; &nbsp;// initializing the LCD&nbsp; lcd.backlight(); // Enable or Turn On the backlight&nbsp;&nbsp;&nbsp; lcdDisplay("WELCOME TO" ,"SMART MEDBOX");&nbsp; Serial.begin(9600);&nbsp; &nbsp; &nbsp; &nbsp;Serial.begin(115200); // Starts the serial communication&nbsp; WiFi.begin(ssid, password);&nbsp; Serial.println("");&nbsp; Serial.print("Connecting");&nbsp; while (WiFi.status() != WL_CONNECTED) {&nbsp; &nbsp; delay(500);&nbsp; &nbsp; Serial.print(".");&nbsp; } &nbsp; Serial.println("");&nbsp; Serial.print("Connected to ");&nbsp; Serial.println(ssid);&nbsp; Serial.print("IP address: ");&nbsp; Serial.println(WiFi.localIP());&nbsp;&nbsp; pinMode(relay, OUTPUT);&nbsp;&nbsp; pinMode(buzzer, OUTPUT);&nbsp;&nbsp; pinMode(ledPin1, OUTPUT);&nbsp;&nbsp; pinMode(ledPin2, OUTPUT);&nbsp;&nbsp;&nbsp; lcdDisplay("System","Ready");&nbsp; &nbsp;&nbsp; nodemcu.begin(9600);&nbsp;} int ByteReceived = 0;void loop(){&nbsp;&nbsp; StaticJsonDocument&lt;1000&gt; doc;DeserializationError error = deserializeJson(doc,nodemcu);if(error) {&nbsp; Serial.println("Invalid JSON Object");&nbsp; return;}else{&nbsp;String ldrValue = doc["val"]; &nbsp; &nbsp; //TO DATABASE&nbsp; if (WiFi.status() == WL_CONNECTED) {&nbsp; &nbsp; WiFiClientSecure client;&nbsp; &nbsp; client.setInsecure();&nbsp; &nbsp;// ldrValue = "010100000000000000001";&nbsp; &nbsp; HTTPClient https;&nbsp;&nbsp; &nbsp; String fullUrl = url + ldrValue&nbsp; ;&nbsp;&nbsp;&nbsp; &nbsp; Serial.println("Requesting " + fullUrl);&nbsp; &nbsp; if (https.begin(client, fullUrl)) {&nbsp; &nbsp; &nbsp; int httpCode = https.GET();&nbsp; &nbsp; &nbsp; Serial.println("============== Response code: " + String(httpCode));&nbsp; &nbsp; &nbsp; if (httpCode &gt; 0) {&nbsp; &nbsp; &nbsp; &nbsp; Serial.println(https.getString());&nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; https.end();&nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; Serial.printf("[HTTPS] Unable to connect\n");&nbsp; &nbsp; }&nbsp; }} //FROM DATABASE&nbsp; if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status&nbsp;&nbsp; &nbsp; WiFiClientSecure client;&nbsp; &nbsp; client.setInsecure();&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; HTTPClient https;&nbsp; //Declare an object of class HTTPClient&nbsp;&nbsp; &nbsp; https.begin(client,getUrl);&nbsp; //Specify request destination&nbsp; &nbsp; int httpCode = https.GET();&nbsp; &nbsp; &nbsp; &nbsp;//Send the request&nbsp;&nbsp;&nbsp; &nbsp; if (httpCode &gt; 0) { //Check the returning code&nbsp; &nbsp; String payload = https.getString();&nbsp; &nbsp;//Get the request response payload&nbsp;&nbsp; &nbsp; String readString = payload; //Split&nbsp; &nbsp; del = readString.indexOf("%");&nbsp; &nbsp; del_1 = readString.indexOf("%", del + 1);&nbsp; &nbsp; del_2 = readString.indexOf("%", del_1 +1);&nbsp;&nbsp; &nbsp; del_3 = readString.indexOf("%", del_2 +1);&nbsp;&nbsp; &nbsp; del_4 = readString.indexOf("%", del_3 +1);&nbsp;&nbsp; &nbsp; del_5 = readString.indexOf("%", del_4 +1);&nbsp;&nbsp; &nbsp; del_6 = readString.indexOf("%", del_5 +1);&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; // Define variables to be executed on the code later by collecting information from the readString as substrings.&nbsp; &nbsp; xname = readString.substring(del + 1, del_1) ;&nbsp; &nbsp; box = readString.substring(del_1 + 1, del_2) ;&nbsp;&nbsp; &nbsp; xtime = readString.substring(del_2 + 1, del_3) ;&nbsp;&nbsp; &nbsp; str = readString.substring(del_3 + 1, del_4) ;&nbsp;&nbsp; &nbsp; rel = readString.substring(del_4 + 1, del_5) ;&nbsp;&nbsp; &nbsp; timeNow = readString.substring(del_5 + 1, del_6) ;&nbsp; &nbsp; &nbsp; Serial.println("DATAGET");&nbsp; &nbsp; Serial.println("Name:");&nbsp; &nbsp; Serial.println(xname);&nbsp;&nbsp; &nbsp; Serial.println("Box:");&nbsp; &nbsp; Serial.println(box);&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; Serial.println("Time:");&nbsp; &nbsp; Serial.println(xtime);&nbsp;&nbsp; &nbsp; Serial.println("Day:");&nbsp; &nbsp; Serial.println(str);&nbsp;&nbsp; &nbsp; Serial.println("Relay:");&nbsp; &nbsp; Serial.println(rel);&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp; Serial.println("Time Now:");&nbsp; &nbsp; Serial.println(timeNow);&nbsp;&nbsp; &nbsp; Serial.println("----------------");&nbsp; &nbsp; &nbsp; //DO TASK&nbsp;&nbsp; &nbsp; &nbsp; lcdDisplay(xname + " " + box,xtime + " " + str );&nbsp; &nbsp; &nbsp;taskToDo();&nbsp; &nbsp; }&nbsp; &nbsp; https.end();&nbsp; &nbsp;//Close connection&nbsp; }////&nbsp; For TESTING//&nbsp; &nbsp; onRed();//&nbsp; &nbsp; lcdDisplay("System","Ready");&nbsp;//&nbsp; &nbsp; delay(5000);&nbsp;//&nbsp; &nbsp; onBlue();//&nbsp; &nbsp; digitalWrite(relay, HIGH); //Off//&nbsp; &nbsp; delay(5000);//&nbsp; &nbsp; Serial.println("Relay Off");//&nbsp; &nbsp;&nbsp;//&nbsp; &nbsp; digitalWrite(relay, HIGH); //Off//&nbsp; &nbsp; delay(5000);//&nbsp; &nbsp; Serial.println("Relay Off"); &nbsp; &nbsp; &nbsp; delay(5000);&nbsp;} void taskToDo(){&nbsp; if(rel=="0"){&nbsp; &nbsp; digitalWrite(ledPin1, LOW);&nbsp;&nbsp;&nbsp; &nbsp; digitalWrite(ledPin2, HIGH);&nbsp;&nbsp; &nbsp; digitalWrite(relay, HIGH); //ON&nbsp; &nbsp;// delay(5000);&nbsp;}else{ //ON&nbsp; &nbsp; buzTone(3);&nbsp; &nbsp; digitalWrite(ledPin1, HIGH);&nbsp;&nbsp;&nbsp; &nbsp; digitalWrite(ledPin2, LOW);&nbsp;&nbsp;&nbsp; &nbsp; digitalWrite(relay, LOW);//On&nbsp;&nbsp; &nbsp; delay(10000);&nbsp;&nbsp;} } void buzTone(int x){&nbsp; &nbsp; for (int i = 1; i &lt;= x; i++) {&nbsp; &nbsp; &nbsp; digitalWrite(buzzer,HIGH) ; //Turn on active buzzer&nbsp; &nbsp; &nbsp; delay (1000);&nbsp; &nbsp; &nbsp; digitalWrite(buzzer,LOW) ; //Turn off active buzzer&nbsp; &nbsp; &nbsp; delay (1000);&nbsp;&nbsp; &nbsp; }} void onRed(){&nbsp; &nbsp;digitalWrite(ledPin1, HIGH);&nbsp;&nbsp;&nbsp; &nbsp;digitalWrite(ledPin2, LOW);&nbsp; &nbsp;}void onBlue(){&nbsp; &nbsp;digitalWrite(ledPin1, LOW);&nbsp;&nbsp;&nbsp; &nbsp;digitalWrite(ledPin2, HIGH);&nbsp; &nbsp; &nbsp;} void offLed(){&nbsp; &nbsp;digitalWrite(ledPin1, LOW);&nbsp;&nbsp;&nbsp; &nbsp;digitalWrite(buzzer, LOW);&nbsp;&nbsp;&nbsp; &nbsp;digitalWrite(ledPin2, LOW);&nbsp; &nbsp; &nbsp;} void lcdDisplay(String x , String y){&nbsp; lcd.setCursor(2, 0);&nbsp; lcd.print(x);&nbsp; lcd.setCursor(2, 1);&nbsp; lcd.print(y);&nbsp; delay(3000);&nbsp; lcd.clear();}<div> </div>