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NFC+MQTT+Display.ino
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NFC+MQTT+Display.ino
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/*
NFC Reader
PN532 reader hooked to ESP32 for MQTT communication and 64px OLED display for offline use
Elechouse documentation:
https://www.elechouse.com/elechouse/images/product/PN532_module_V3/PN532_%20Manual_V3.pdf
Display setup thanks to https://how2electronics.com/interfacing-pn532-nfc-rfid-module-with-arduino/
SCL on ESP32 pin D22
SCA on ESP32 pin D21
*/
// for NFC (we're using I2C with the display but original example included SPI)
#if 0
#include <SPI.h>
#include <PN532_SPI.h>
#include <PN532.h>
#include <NfcAdapter.h>
PN532_SPI pn532spi(SPI, 10);
NfcAdapter nfc = NfcAdapter(pn532spi);
#else
#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>
PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);
#endif
// for MQTT
#include <PubSubClient.h>
#include <ArduinoJson.h>
// for WiFi
#include <WiFi.h>
// for WiFi
const char* ssid = "mySSID";
const char* password = "myPASSWORD";
// for MQTT
const char* mqtt_server = "192.168.x.x";
//for display:
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.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)
// The pins for I2C are defined by the Wire-library.
// On an arduino UNO: A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO: 2(SDA), 3(SCL), ...
#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
static const unsigned char PROGMEM logo_bmp[] =
{ 0b00000000, 0b11000000,
0b00000001, 0b11000000,
0b00000001, 0b11000000,
0b00000011, 0b11100000,
0b11110011, 0b11100000,
0b11111110, 0b11111000,
0b01111110, 0b11111111,
0b00110011, 0b10011111,
0b00011111, 0b11111100,
0b00001101, 0b01110000,
0b00011011, 0b10100000,
0b00111111, 0b11100000,
0b00111111, 0b11110000,
0b01111100, 0b11110000,
0b01110000, 0b01110000,
0b00000000, 0b00110000 };
// end for display
// Allocate the JSON document
//
// Inside the brackets, 200 is the RAM allocated to this document.
// Don't forget to change this value to match your requirement.
// Use https://arduinojson.org/v6/assistant to compute the capacity.
StaticJsonDocument<256> doc;
// StaticJsonObject allocates memory on the stack, it can be
// replaced by DynamicJsonDocument which allocates in the heap.
//
// DynamicJsonDocument doc(200);
//for JSON message processing
String msg = "no message detected";
String uid = "no UID detected";
// end for JSON
/************* MQTT TOPICS (change these topics as you wish) **************************/
const char* outTopic = "d/e32_006/nfc_001";
const char* inTopic = "c/e32_006/nfc_001";
// Callback function header
void callback(char* topic, byte* payload, unsigned int length);
WiFiClient espClient;
PubSubClient client(espClient);
// Callback function
void callback(char* topic, byte* payload, unsigned int length) {
// In order to republish this payload, a copy must be made
// as the orignal payload buffer will be overwritten whilst
// constructing the PUBLISH packet.
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
// Allocate the correct amount of memory for the payload copy
byte* p = (byte*)malloc(length);
// Copy the payload to the new buffer
memcpy(p,payload,length);
client.publish(outTopic, p, length);
// Free the memory
free(p);
}
void setup_wifi() {
delay(10);
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());
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "RandoESP32Client-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish(outTopic, "hello world");
// ... and resubscribe
client.subscribe("inTopic");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
Serial.begin(115200);
//while (!Serial) continue;
Serial.println("NDEF Reader");
nfc.begin();
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed for OLED display"));
}
// Clear display buffer
display.clearDisplay();
if (client.connect("espClient")) {
client.publish(outTopic,"hello world");
client.subscribe("inTopic");
}
}
void sendState() {
// Allocate the JSON document
//StaticJsonDocument<256> doc;
// Inside the brackets, 200 is the RAM allocated to this JSON document.
// Don't forget to change this value to match your requirement.
// Use https://arduinojson.org/v6/assistant to compute the capacity.
JsonObject root = doc.to<JsonObject>();
root["location"] = "Fridge";
JsonObject tag = root.createNestedObject("tag");
tag["uid"] = uid;
tag["msg"] = msg;
serializeJsonPretty(doc, Serial);
Serial.println(".");
Serial.println("above should be pretty json");
Serial.print("Topic is : ");
Serial.println(outTopic);
char buffer[256];
size_t n = serializeJson(doc, buffer);
client.publish(outTopic, buffer, n);
//client.publish(outTopic, serializeJson(doc))
}
void loop() {
if (!client.connected()) {
reconnect();
}
if (WiFi.status() != WL_CONNECTED) {
delay(1);
Serial.print("WIFI Disconnected. Attempting reconnection.");
setup_wifi();
return;
}
client.loop();
Serial.println("\nScan an NFC tag\n");
Serial.print("nfc.tagPresent() = ");
Serial.println(nfc.tagPresent());
if (nfc.tagPresent())
{
NfcTag tag = nfc.read();
Serial.println(tag.getTagType());
Serial.print("UID: ");Serial.println(tag.getUidString());
uid = tag.getUidString();
// if (tag.hasNdefMessage()) // every tag won't have a message
// {
Serial.print("\nThis NFC Tag contains an NDEF Message with ");
NdefMessage message = tag.getNdefMessage();
Serial.print(message.getRecordCount());
Serial.print(" NDEF Record");
if (message.getRecordCount() != 1) {
Serial.print("s");
}
Serial.println(".");
// cycle through the records, printing some info from each
int recordCount = message.getRecordCount();
for (int i = 0; i < recordCount; i++)
{
Serial.print("\nNDEF Record ");Serial.println(i+1);
NdefRecord record = message.getRecord(i);
// NdefRecord record = message[i]; // alternate syntax
Serial.print(" TNF: ");Serial.println(record.getTnf());
Serial.print(" Type: ");Serial.println(record.getType()); // will be "" for TNF_EMPTY
// The TNF and Type should be used to determine how your application processes the payload
// There's no generic processing for the payload, it's returned as a byte[]
int payloadLength = record.getPayloadLength();
byte payload[payloadLength];
record.getPayload(payload);
// Print the Hex and Printable Characters
Serial.print(" Payload (HEX): ");
PrintHexChar(payload, payloadLength);
// Force the data into a String (might work depending on the content)
// Real code should use smarter processing
String payloadAsString = "";
for (int c = 0; c < payloadLength; c++) {
payloadAsString += (char)payload[c];
}
Serial.print(" Payload (as String): ");
Serial.println(payloadAsString);
msg = payloadAsString;
Serial.print("msg = ");
Serial.println(msg);
/*
for (int c = 0; c < payloadLength; c++) {
msg += (char)payload[c];
}
Serial.print(" Payload (as String): ");
Serial.println(msg);
*/
// if id is blank will return ""
if (uid != "") {
Serial.print(" ID: ");Serial.println(uid);
}
display.clearDisplay();
display.setCursor(0, 0); //oled display
display.setTextSize(1);
display.setTextColor(WHITE);
display.print("NFC Payload:");
display.setCursor(0, 15); //oled display
display.setTextSize(1);
display.setTextColor(WHITE);
display.print(msg);
display.display();
}
// }
}
// call to publish MQTT message with UID and message as JSON object
sendState();
delay(500);
}