begin documenting the project, README

reverse_engineering/esp32_emulate_printer.ino

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+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLEUtils.h>
+#include <BLE2902.h>
+
+// https://www.uuidgenerator.net/
+
+class ServerCallbacks : public BLEServerCallbacks{
+    void onConnect(BLEServer *pServer){
+        Serial.println("Connected.");
+    }
+    void onDisconnect(BLEServer *pServer){
+        pServer->startAdvertising();
+        Serial.println("Disconnected, restarting advertising.");
+    }
+};
+
+const int MAX_LINE = 2000;
+int lineCol = 0;
+void myPrint(String s){
+    int len = s.length();
+    if(lineCol + len >= MAX_LINE){
+        Serial.println("");
+        lineCol = 0;
+    }
+    Serial.print(s);
+    lineCol += len;
+}
+
+void printReceived(BLECharacteristic *pRxCharacteristic){
+    String uuid = pRxCharacteristic->getUUID().toString();
+    String rxValue = pRxCharacteristic->getValue();
+    // Serial.print(uuid);
+    // Serial.print(" > ");
+    String hexByte = "##";
+
+    for(int i = 0; i < rxValue.length(); i++){
+        uint8_t byte = rxValue[i];
+        hexByte[0] = byte/16;
+        hexByte[1] = byte%16;
+        for(int i = 0; i < 2; i++){
+            hexByte[i] += (hexByte[i] >= 10 ? ('A'-10) : '0');
+        }
+        myPrint(hexByte);
+    }
+}
+
+BLECharacteristic *pRxChar = nullptr, *pTxChar = nullptr;
+
+class WriteCharacteristicCallbacks: public BLECharacteristicCallbacks {
+    void onWrite(BLECharacteristic *pRxCharacteristic){
+        printReceived(pRxCharacteristic);
+        if(pRxCharacteristic == pRxChar){
+            pTxChar->setValue("\x51\x78\xA3\x01\x03\x00\x00\x0F\x24\x3F\xFF");
+            pTxChar->notify();
+        }
+    }
+};
+
+void setup() {
+    Serial.begin(115200);
+    
+    /// SETUP BLE
+    BLEDevice::init("X6");
+
+    BLEServer *pServer = BLEDevice::createServer();
+    pServer->setCallbacks(new ServerCallbacks());
+
+    {
+        BLEService *pService_AE30 = pServer->createService("AE30");
+
+        BLECharacteristic *pChar_AE01 = pService_AE30->createCharacteristic("AE01", BLECharacteristic::PROPERTY_WRITE_NR);
+        pChar_AE01->setCallbacks(new WriteCharacteristicCallbacks());
+        pRxChar = pChar_AE01;
+
+        BLECharacteristic *pChar_AE02 = pService_AE30->createCharacteristic("AE02", BLECharacteristic::PROPERTY_NOTIFY);
+        pChar_AE02->addDescriptor(new BLE2902());
+        pTxChar = pChar_AE02;
+
+        BLECharacteristic *pChar_AE03 = pService_AE30->createCharacteristic("AE03", BLECharacteristic::PROPERTY_WRITE_NR);
+        pChar_AE03->setCallbacks(new WriteCharacteristicCallbacks());
+
+        BLECharacteristic *pChar_AE04 = pService_AE30->createCharacteristic("AE04", BLECharacteristic::PROPERTY_NOTIFY);
+        pChar_AE04->addDescriptor(new BLE2902());
+
+        BLECharacteristic *pChar_AE05 = pService_AE30->createCharacteristic("AE05", BLECharacteristic::PROPERTY_INDICATE);
+        pChar_AE05->addDescriptor(new BLE2902());
+
+        BLECharacteristic *pChar_AE10 = pService_AE30->createCharacteristic("AE10", BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE);
+        pChar_AE10->setCallbacks(new WriteCharacteristicCallbacks());
+        
+        pService_AE30->start();
+    }
+
+    {
+        BLEService *pService_AE3A = pServer->createService("AE3A");
+
+        BLECharacteristic *pChar_AE3B = pService_AE3A->createCharacteristic("AE3B", BLECharacteristic::PROPERTY_WRITE_NR);
+        pChar_AE3B->addDescriptor(new BLE2902());
+
+        BLECharacteristic *pChar_AE3C = pService_AE3A->createCharacteristic("AE3C", BLECharacteristic::PROPERTY_NOTIFY);
+        pChar_AE3C->addDescriptor(new BLE2902());
+
+        pService_AE3A->start();
+    }
+
+    BLEAdvertising *pAdvertising = pServer->getAdvertising();
+    pAdvertising->start();
+
+    Serial.println("Setup done!");
+}
+
+void loop(){}