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Added slides, and readme
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‎BETH Slides Submission.pptx

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‎GPS/GPS.ino

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// Author: MrBeans
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// Date: February 2019
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// Place: BETH @ ETH, Zurich
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// OpenLicence
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// Code inspired by examples of TinyGPS++ & ESP8266WebServer libraries
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#include <WiFiClient.h>
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#include <ESP8266mDNS.h>
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#include <ESP8266WebServer.h>
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#include <TinyGPS++.h>
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#include <SoftwareSerial.h>
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#include <ESP8266WiFi.h>
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// MDNSResponder mdns;
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// Connect to local Wifi Network SSID
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const char* ssid = "Abc";
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const char* password = "xbpd1712";
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// Create instance of WebServer
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ESP8266WebServer server(3000);
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// Create global variables we want to send to the blockchain
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double longitude = 0;
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double latitude = 0;
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int yearr = 0;
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int monthh = 0;
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int dayy = 0;
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int hourr = 0;
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int minutee = 0;
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int secondd = 0;
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// Precision of longitude/latitude
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const int prec = 10e6;
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// Set up connection between ESP & GPS device
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static const int RXPin = D6, TXPin = D7;
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static const uint32_t GPSBaud = 9600;
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// Create instance of TinyGPS++ object
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TinyGPSPlus gps;
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// Create serial connection to the GPS device
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SoftwareSerial ss(RXPin, TXPin);
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// Create html code for website displaying variables we want to send to the blockchain
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void handleRoot() {
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String javascript = "";
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char temp[600];
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int sec = millis() / 1000;
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int min = sec / 60;
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int hr = min / 60;
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snprintf ( temp, 600,
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"<html>\
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<head>\
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<meta http-equiv='refresh' content='1'/>\
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<title>ESP8266 Demo</title>\
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<style>\
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body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
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</style>\
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</head>\
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<body>\
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<h1>Hello from ESP8266!</h1>\
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<p>Latitude: %02d.%07d</p>\
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<p>Longitude: %02d.%07d</p>\
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<p>Day: %02d</p>\
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<p>Month: %02d</p>\
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<p>Year: %02d</p>\
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<p>Hour: %02d</p>\
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<p>Minute: %02d</p>\
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<p>Seconds: %02d</p>\
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</body>\
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</html>",
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int(latitude), int(latitude * prec) % prec , int(longitude), int(longitude * prec) % prec , dayy, monthh, yearr, hourr + 1, minutee, secondd
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);
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server.send ( 200, "text/html", temp );
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}
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// Default function
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void handleNotFound() {
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String message = "File Not Found\n\n";
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message += "URI: ";
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message += server.uri();
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message += "\nMethod: ";
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message += (server.method() == HTTP_GET) ? "GET" : "POST";
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message += "\nArguments: ";
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message += server.args();
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message += "\n";
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for (uint8_t i = 0; i < server.args(); i++) {
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message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
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}
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server.send(404, "text/plain", message);
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}
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//Initial set-up
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void setup()
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{
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Serial.begin(115200);
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delay(10);
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// Connect WiFi
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Serial.println();
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Serial.println();
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Serial.print("Connecting to ");
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Serial.println(ssid);
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WiFi.hostname("Name");
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("");
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Serial.println("WiFi connected");
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// Print the IP address
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Serial.print("IP address: ");
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Serial.println(WiFi.localIP());
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/* if (mdns.begin("esp8266"), WiFi.localIP()) {
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Serial.println("MDNS responder started");
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}
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*/
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// Create html code
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server.on("/", handleRoot);
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// Default function
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server.onNotFound(handleNotFound);
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// Start server
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server.begin();
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Serial.println("HTTP server started");
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//Start GPS connection
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ss.begin(GPSBaud);
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Serial.println("Start up successfully completed");
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}
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// Read out and display GPS data
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void displayInfo()
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{
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// location data
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Serial.print(F("Location: "));
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if (gps.location.isValid())
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{
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Serial.print(gps.location.lat(), 6);
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latitude = gps.location.lat();
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Serial.print(F(","));
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Serial.print(gps.location.lng(), 6);
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longitude = gps.location.lng();
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}
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else
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{
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Serial.print(F("INVALID"));
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}
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// date data
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Serial.print(F(" Date/Time: "));
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if (gps.date.isValid())
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{
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Serial.print(gps.date.month());
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Serial.print(F("/"));
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monthh = gps.date.month();
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Serial.print(gps.date.day());
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dayy = gps.date.day();
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Serial.print(F("/"));
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Serial.print(gps.date.year());
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yearr = gps.date.year();
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}
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else
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{
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Serial.print(F("INVALID"));
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}
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// time data
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Serial.print(F(" "));
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if (gps.time.isValid())
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{
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if (gps.time.hour() < 10) Serial.print(F("0"));
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Serial.print(gps.time.hour());
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Serial.print(F(":"));
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hourr = gps.time.hour();
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if (gps.time.minute() < 10) Serial.print(F("0"));
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Serial.print(gps.time.minute());
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Serial.print(F(":"));
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minutee = gps.time.minute();
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if (gps.time.second() < 10) Serial.print(F("0"));
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Serial.print(gps.time.second());
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Serial.print(F("."));
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secondd = gps.time.second();
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if (gps.time.centisecond() < 10) Serial.print(F("0"));
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Serial.print(gps.time.centisecond());
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}
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else
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{
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Serial.print(F("INVALID"));
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}
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Serial.println();
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}
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void loop()
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{
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/*
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// Blockchain connection
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//call web3 methods
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char result[128];
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web3.Web3ClientVersion(result);
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USE_SERIAL.println(result);
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web3.Web3Sha3("0x68656c6c6f20776f726c64", result);
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USE_SERIAL.println(result);
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//call to Contract
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Contract contract(&web3, CONTRACT_ADDRESS);
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strcpy(contract.options.from, MY_ADDRESS);
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strcpy(contract.options.gasPrice,"2000000000000");
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contract.options.gas = 5000000;
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contract.SetupContractData(result, "get()");
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contract.Call(result);
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USE_SERIAL.println(result);
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//sendTransaction to Contract
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Contract contract(&web3, CONTRACT_ADDRESS);
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contract.SetPrivateKey((uint8_t*)PRIVATE_KEY);
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uint32_t nonceVal = (uint32_t)web3.EthGetTransactionCount((char *)MY_ADDRESS);
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uint32_t gasPriceVal = 141006540;
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uint32_t gasLimitVal = 3000000;
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uint8_t toStr[] = CONTRACT_ADDRESS;
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uint8_t valueStr[] = "0x00";
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uint8_t dataStr[100];
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memset(dataStr, 0, 100);
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contract.SetupContractData((char*)dataStr, "set(uint256)", 123);
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contract.SendTransaction((uint8_t *) result,
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nonceVal, gasPriceVal, gasLimitVal, toStr, valueStr, dataStr);
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USE_SERIAL.println(result);
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////////////////////////////////////////////////////////////////////////////////////*/
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// while connection to GPS device is established
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while (ss.available() > 0)
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{
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// read GPS data
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if (gps.encode(ss.read()))
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displayInfo();
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// 5 second steps
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//delay(5000);
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// update website
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server.handleClient();
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//mdns.update();
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}
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// default if GPS device is not recognized
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if (millis() > 5000 && gps.charsProcessed() < 10)
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{
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Serial.println(F("No GPS detected: check wiring."));
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}
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}

‎README.txt

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Inside Mr. Beans folder:
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- "GPS/GPS.ino" to simulate acquisition of GPS data from an end node (e.g. harvester machine), to be then sent to the blockchain (not implemented yet)
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- "MetaCoin" folder: storing all custom solidity code under:
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"contracts/harvest.sol"; "contracts/warehouse.sol"; "contracts/trader.sol"; "contracts/sharedlibs.sol".
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- "test.js" file: containing instructions to be executed in Truffle console to test written smart contracts. Further instructions are given inside.
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