Initial Arduino code for wallet handshake

Crypto_Handshake.ino

@@ -0,0 +1,193 @@
+#include <SPI.h>
+#include <nRF24L01.h>
+#include <RF24.h>
+
+#define CE_PIN   1
+#define CSN_PIN  0
+
+const byte address1[5] = {'R','x','A','A','A'};
+const byte address2[5] = {'R','x','B','B','B'};
+
+RF24 radio(CE_PIN, CSN_PIN);
+
+char receive_data[257]; // this length must match dataToSend in the TX
+bool new_data = false;
+
+char data_to_send[257];
+bool rslt = false;
+
+bool transaction_check = false;
+
+String input = "";
+
+void setup() {
+  Serial.begin(9600);
+
+  radio.begin();
+  radio.setDataRate( RF24_250KBPS );
+  radio.setRetries(3,5); // delay, count
+
+  while (true){
+    if (Serial.available() > 0) {
+      input = Serial.readStringUntil('\n');
+      break;
+    }
+  }
+  if (input[0] == '0'){
+    radio.openWritingPipe(address1);
+    radio.openReadingPipe(1, address2);
+    Serial.println("code_0");
+  }
+  else if (input[0] == '1'){
+    radio.openWritingPipe(address2);
+    radio.openReadingPipe(1, address1);
+    Serial.println("code_1");
+  }
+  else{
+    Serial.println(input);
+    Serial.println("code_init_fail");
+  }
+
+}
+
+void loop() {
+  if (Serial.available() > 0) {
+
+    input = Serial.readStringUntil('\n');
+
+    if (input[0] == 's'){
+
+      Serial.println("code_send");
+      data_to_send[0] = 't';          //test connection
+      while (rslt == false){
+        send_data();   
+      }
+      Serial.println("sent_test");
+      rslt = false;
+
+      data_to_send[0] = 's';            //construct verification data
+      for (int i = 1; i < 256; i++){       
+        data_to_send[i] = input[i];
+      }
+
+      while (rslt == false){            //send verification data
+        send_data();
+      }
+      rslt = false;
+      Serial.println(data_to_send);
+
+      radio.startListening();
+      while (new_data == false){
+        get_data();
+      }
+      new_data = false;
+
+      Serial.println(receive_data);
+
+      if (receive_data[0] == 's'){
+
+        transaction_check = true;
+        for (int i = 129; i < 257; i++){
+          if (input[i] != receive_data[i]){
+            transaction_check = false;
+            Serial.println("wrong address or amount sent");
+            data_to_send[0] = 'e';
+            break;
+          }
+        }
+        if (transaction_check == true){
+          for (int i = 1; i < 129; i++){
+            if (input[i+256] != receive_data[i]){
+              transaction_check = false;
+              Serial.println("wrong address or amount sent");
+              data_to_send[0] = 'e';
+            }
+          }
+        }
+        if (transaction_check == true){
+          Serial.println("send_it");
+        }
+
+      }
+      else if(receive_data[0] == 'e'){
+        Serial.println("wrong address or amount sent");
+      }
+
+    }
+
+    else if (input[0] == 'r'){
+
+      Serial.println("code_receive");
+
+      radio.startListening();
+
+      while (new_data == false){
+        get_data();
+      }
+      new_data = false;
+      Serial.println(receive_data);
+
+      if (receive_data[0] == 't'){
+        Serial.println("received_test");
+
+        while(new_data == false){
+          get_data();
+        }
+        radio.stopListening();
+        Serial.println(receive_data);
+
+        transaction_check = true;
+        for (int i = 129; i < 257; i++){
+          if (input[i] != receive_data[i]){
+            transaction_check = false;
+            Serial.println("wrong address or amount sent");
+            data_to_send[0] = 'e';
+            break;
+          }
+        }
+        if (transaction_check == true){
+          for (int i = 1; i < 129; i++){
+            if (input[i+256] != receive_data[i]){
+              transaction_check = false;
+              Serial.println("wrong address or amount sent");
+              data_to_send[0] = 'e';
+            }
+          }
+        }
+
+        if (transaction_check == true){
+          Serial.println("send it");
+          data_to_send[0] = 's';            //construct verification data
+          for (int i = 1; i < 256; i++){       
+          data_to_send[i] = input[i];
+          }
+          send_data();
+        }
+        else{
+          send_data();
+        }
+      }
+      else{
+        Serial.println("code_s_r_fail");
+      }
+
+    }
+    else{
+      Serial.println("formatting error, check first character sent to Serial");
+    }
+  }
+  input = "";
+}
+
+void get_data() {
+    if ( radio.available() ) {
+        radio.read( &receive_data, sizeof(receive_data) );
+        new_data = true;
+    }
+}
+
+void send_data() {
+
+    rslt = radio.write( data_to_send, sizeof(data_to_send) );
+
+}