Created MQTT controlled Display

OledMQTTInfoDisplay/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

OledMQTTInfoDisplay/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

OledMQTTInfoDisplay/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

OledMQTTInfoDisplay/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

OledMQTTInfoDisplay/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32doit-devkit-v1]
+platform = espressif32
+board = esp32doit-devkit-v1
+framework = arduino
+lib_deps = 
+	khoih-prog/ESP_WiFiManager@^1.1.2
+	monstrenyatko/ArduinoMqtt@^1.5.1
+	bblanchon/ArduinoJson@^6.16.1
+	knolleary/PubSubClient@^2.8
+    adafruit/Adafruit SSD1306@^2.4.0

OledMQTTInfoDisplay/src/main.cpp

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+/*********
+  Rui Santos
+  Complete project details at https://randomnerdtutorials.com  
+*********/
+
+// I connected SCK to D22 and SDA to D21 - but all I get is a weird pattern - is the dislay broken?
+
+#include <Arduino.h>
+#include <Adafruit_I2CDevice.h> 
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include <ArduinoJson.h>
+
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+
+// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
+
+// Update these with values suitable for your network.
+
+const char* ssid = "Jnd-Front";
+const char* password = "Paris2016";
+const char* mqtt_server = "mqtt.ddns.kawomi.com";
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+unsigned long lastMsg = 0;
+#define MSG_BUFFER_SIZE	(50)
+char msg[MSG_BUFFER_SIZE];
+
+void setup_wifi() {
+
+  delay(10);
+  // We start by connecting to a WiFi network
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  randomSeed(micros());
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+
+  display.setCursor(0, 0);
+  display.clearDisplay();
+  display.print("Wifi connected\nIP addres:\n");
+  display.print(WiFi.localIP());
+  display.display();
+  delay(1000);
+}
+
+
+void reconnect() {
+  // Loop until we're reconnected
+  while (!client.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    // Create a random client ID
+    String clientId = "ESP32Client-";
+    clientId += String(random(0xffff), HEX);
+    // Attempt to connect
+    if (client.connect(clientId.c_str())) {
+      Serial.println("MQTT connected");
+      client.publish("OLED", "Connected");
+      client.subscribe("OLED/setText");
+    } else {
+      Serial.print("MQTT failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+void callback(char* topic, byte* payload, unsigned int length) {
+  Serial.print("Message arrived [");
+  Serial.print(topic);
+ 
+  String recBuf="";
+  Serial.print("] ");
+  for (int i = 0; i < length; i++) {
+    recBuf += (char)payload[i];
+  }
+  Serial.println(recBuf);
+
+  StaticJsonDocument<1024> jsonDoc;
+  deserializeJson(jsonDoc,recBuf);
+  const char* theText=jsonDoc["text"];
+  int theSize=jsonDoc["size"];
+
+  display.setCursor(40, 0);
+  display.setTextSize(9);
+  display.print("#");
+  display.display();
+  delay(500);
+
+  display.setCursor(0, 0);
+  display.setTextSize(theSize);
+  display.clearDisplay();
+  display.print(theText);
+  display.display();
+
+}
+
+
+void setup() {
+  Serial.begin(115200);
+
+  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
+    Serial.println(F("SSD1306 allocation failed"));
+    for(;;);
+  }
+  delay(2000);
+  display.clearDisplay();
+ display.display(); 
+
+  display.setTextSize(1);
+  display.setTextColor(WHITE);
+  display.setCursor(0, 0);
+  // Display static text
+  display.println("Line 1 -");
+  display.println("Line 2 --");
+  display.println("Line 3 ---");
+  display.display(); 
+
+  setup_wifi(); 
+  client.setServer(mqtt_server, 1883);
+  client.setCallback(callback);
+}
+
+void loop() {
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
+}
+

OledMQTTInfoDisplay/test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html