commit 642100181d156cf829865d2254a193ddc82f7819
Author: Julian Metzler <git@mezgr.de>
Date:   Fri Feb 9 23:28:40 2018 +0100

    Initial release

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8dc0329
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.tmp
+Thumbs.db
diff --git a/WiFi_Shield.ino b/WiFi_Shield.ino
new file mode 100644
index 0000000..62b4deb
--- /dev/null
+++ b/WiFi_Shield.ino
@@ -0,0 +1,573 @@
+/*
+   ESP8266 WiFi Shield for xatLabs IBIS converter
+   (C) 2017-2018 Julian Metzler
+*/
+
+/*
+   UPLOAD SETTINGS
+
+   Board: Generic ESP8266 Module
+   Flash Mode: DIO
+   Flash Size: 4M
+   SPIFFS Size: 1M
+   Debug port: Disabled
+   Debug Level: None
+   Reset Method: ck
+   Flash Freq: 40 MHz
+   CPU Freq: 80 MHz
+   Upload Speed: 115200
+*/
+
+#define ARDUINO_OTA_ENABLEDXXX
+#define INIT_EEPROMXXX
+
+#include <ESP8266WiFi.h>
+//#include <WiFiClientSecure.h>
+#include <ESP8266WebServer.h>
+#include <WiFiUdp.h>
+#include <FS.h>
+#include <EEPROM.h>
+#include <ArduinoJson.h>
+#include <ESP8266HTTPClient.h>
+#include <ESP8266httpUpdate.h>
+
+#ifdef ARDUINO_OTA_ENABLED
+#include <ArduinoOTA.h>
+#endif
+
+#include "ibis.h"
+
+/*
+   TYPEDEFS
+*/
+
+enum UpdateStatus {
+  US_NO_UPDATE,
+  US_AVAILABLE,
+  US_FAILED
+};
+
+/*
+   CONSTANTS
+*/
+
+#define PIN_STATUS 10
+#define PIN_CONFIG 0
+
+#define WIFI_TIMEOUT 10000
+
+/*
+   GLOBAL VARIABLES
+*/
+
+unsigned long HW_GROUP = 1;               // Changes with hardware changes that require software changes
+unsigned long FW_VERSION = 1802080001;    // Changes with each release; must always increase
+unsigned long SP_VERSION = 0;             // Loaded from SPIFFS; changed with each SPIFFS build; must always increase (uses timestamp as version)
+
+// HTTPS update settings
+//String UPDATE_HOST = "static.mezgrman.de";
+//int UPDATE_PORT = 443;
+
+// HTTP update settings
+String UPDATE_URL_BASE = "http://static.mezgrman.de/firmware/wifi_shield/";
+
+// Start time of the last WiFi connection attempt
+unsigned long wifiTimer = 0;
+bool wifiTimedOut = false;
+
+// Variables for Station WiFi
+String STA_SSID;
+String STA_PASS;
+bool STA_SETUP = false;
+
+// Variables for Access Point WiFi
+String AP_SSID = "xatLabs WiFi Shield";
+String AP_PASS = "xatlabs_wifi";
+bool AP_ACTIVE = false;
+
+// Variables for keeping track of the config button
+volatile bool btnState = 0;           // Current button state
+volatile bool btnPressed = 0;         // Flag to check if the last button press has already been processed
+volatile unsigned long btnTimer = 0;  // Start time of last button press (only while pressed)
+volatile unsigned long btnDur = 0;    // Duration of the last button press (only while released)
+
+ESP8266WebServer server(80);
+WiFiServer IBISServer(5001);
+WiFiClient client;
+
+/*
+   CONFIG FILE HANDLING
+*/
+
+void reset_EEPROM() {
+  for (byte i = 0; i < 96; i++) {
+    EEPROM.write(i, 0x00);
+  }
+  EEPROM.commit();
+}
+
+bool loadConfig() {
+  File configFile = SPIFFS.open("/config.json", "r");
+  if (!configFile) {
+    return false;
+  }
+
+  size_t size = configFile.size();
+  if (size > 1024) {
+    return false;
+  }
+
+  // Allocate a buffer to store contents of the file.
+  std::unique_ptr<char[]> buf(new char[size]);
+
+  // We don't use String here because ArduinoJson library requires the input
+  // buffer to be mutable. If you don't use ArduinoJson, you may as well
+  // use configFile.readString instead.
+  configFile.readBytes(buf.get(), size);
+
+  StaticJsonBuffer<200> jsonBuffer;
+  JsonObject& json = jsonBuffer.parseObject(buf.get());
+
+  if (!json.success()) {
+    return false;
+  }
+
+  /*STA_SSID = json["WiFiSSID"].as<String>();
+    STA_PASS = json["WiFiPassword"].as<String>();
+    STA_SETUP = json["WiFiSetup"];*/
+  SP_VERSION = json["SPVersion"];
+
+  char curChar;
+  bool ssidSetup = false;
+  bool passSetup = false;
+  STA_SSID = "";
+  for (byte i = 0; i < 32; i++) {
+    curChar = EEPROM.read(i);
+    if (curChar == 0x00) {
+      break;
+    }
+    STA_SSID += curChar;
+    ssidSetup = true;
+  }
+  STA_PASS = "";
+  for (byte i = 0; i < 64; i++) {
+    curChar = EEPROM.read(i + 32);
+    if (curChar == 0x00) {
+      break;
+    }
+    STA_PASS += curChar;
+    passSetup = true;
+  }
+  STA_SETUP = (ssidSetup && passSetup);
+
+  return true;
+}
+
+bool saveConfig() {
+  StaticJsonBuffer<200> jsonBuffer;
+  JsonObject& json = jsonBuffer.createObject();
+  /*json["WiFiSSID"] = STA_SSID;
+    json["WiFiPassword"] = STA_PASS;
+    json["WiFiSetup"] = STA_SETUP;*/
+  json["SPVersion"] = SP_VERSION;
+
+  File configFile = SPIFFS.open("/config.json", "w");
+  if (!configFile) {
+    return false;
+  }
+  json.printTo(configFile);
+
+  reset_EEPROM();
+  for (byte i = 0; i < STA_SSID.length(); i++) {
+    EEPROM.write(i, STA_SSID.charAt(i));
+  }
+  for (byte i = 0; i < STA_PASS.length(); i++) {
+    EEPROM.write(i + 32, STA_PASS.charAt(i));
+  }
+  EEPROM.commit();
+
+  return true;
+}
+
+/*
+   HELPER FUNCTIONS
+*/
+
+void setLED(bool state) {
+  digitalWrite(PIN_STATUS, state);
+}
+
+void blinkLEDSingle(unsigned int duration) {
+  setLED(1);
+  delay(duration);
+  setLED(0);
+}
+
+void blinkLEDLoop(unsigned int duration) {
+  blinkLEDSingle(duration);
+  delay(duration);
+}
+
+/*
+   WEB SERVER
+*/
+
+void handleNotFound() {
+  String message = "File Not Found\n\n";
+  message += "URI: ";
+  message += server.uri();
+  message += "\nMethod: ";
+  message += (server.method() == HTTP_GET) ? "GET" : "POST";
+  message += "\nArguments: ";
+  message += server.args();
+  message += "\n";
+  for (uint8_t i = 0; i < server.args(); i++) {
+    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
+  }
+  server.send(404, "text/plain", message);
+}
+
+String formatPageBase(String content) {
+  String page;
+  page += "<html>";
+  page += "<head>";
+  page += "<link rel='shortcut icon' href='/favicon.ico'>";
+  page += "<meta name='viewport' content='width=device-width, initial-scale=1.0'>";
+  page += "<meta charset='UTF-8'>";
+  page += "<link rel='stylesheet' href='/main.css'>";
+  page += "<title>WiFi Shield</title>";
+  page += "</head>";
+  page += "<body>";
+  page += content;
+  page += "</body>";
+  page += "</html>";
+  return page;
+}
+
+void handleRoot() {
+  String c;
+  c += "<h1>WiFi Shield</h1>";
+  c += "<div>Current SSID: ";
+  if (AP_ACTIVE) {
+    c += AP_SSID;
+  } else if (STA_SETUP) {
+    c += STA_SSID;
+  } else {
+    c += "None";
+  }
+  c += "</div>";
+  c += "<form action='/wifi-setup' method='post'>";
+  c += "<table>";
+  c += "<tr><td>SSID</td><td><input type='text' name='ssid' /></td></tr>";
+  c += "<tr><td>Password</td><td><input type='password' name='password' /></td></tr>";
+  c += "<tr><td><input type='submit' value='Save and Reboot' /></td></tr>";
+  c += "</table>";
+  c += "</form>";
+  c += "<a href='/check-update'>Check for firmware update</a>";
+  server.send(200, "text/html", formatPageBase(c));
+}
+
+void handle_wifi_setup() {
+  STA_SSID = server.arg("ssid");
+  STA_PASS = server.arg("password");
+  STA_SETUP = true;
+  saveConfig();
+  server.sendHeader("Location", "/", true);
+  server.send(303, "text/plain", "");
+  ESP.restart();
+}
+
+void handle_check_update() {
+  String c;
+  UpdateStatus fwStatus = checkForFWUpdate();
+  UpdateStatus spStatus = checkForSPUpdate();
+  c += "<h1>Update Status</h1>";
+  c += "<table><tr><td>Firmware version:</td>";
+  c += "<td>";
+  c += "WS-";
+  c += HW_GROUP;
+  c += "-";
+  c += FW_VERSION;
+  c += "</td>";
+  if (fwStatus == US_AVAILABLE) {
+    c += "<td>Update available</td>";
+    c += "<td><form action='/update-fw' method='post'><input type='submit' value='Update' /></form></td>";
+  } else if (fwStatus == US_FAILED) {
+    c += "<td>Update check failed</td>";
+  } else if (fwStatus == US_NO_UPDATE) {
+    c += "<td>No update available</td>";
+  }
+  c += "</tr>";
+  c += "<tr><td>Filesystem version:</td>";
+  c += "<td>";
+  c += "WSF-";
+  c += HW_GROUP;
+  c += "-";
+  c += SP_VERSION;
+  c += "</td>";
+  if (spStatus == US_AVAILABLE) {
+    c += "<td>Update available</td>";
+    c += "<td><form action='/update-sp' method='post'><input type='submit' value='Update' /></form></td>";
+  } else if (spStatus == US_FAILED) {
+    c += "<td>Update check failed</td>";
+  } else if (spStatus == US_NO_UPDATE) {
+    c += "<td>No update available</td>";
+  }
+  c += "</tr></table>";
+  server.send(200, "text/html", formatPageBase(c));
+}
+
+void handle_update_fw() {
+  server.sendHeader("Location", "/check-update", true);
+  server.send(303, "text/plain", "");
+  if (checkForFWUpdate() == US_AVAILABLE) {
+    doFWUpdate();
+  }
+}
+
+void handle_update_sp() {
+  server.sendHeader("Location", "/check-update", true);
+  server.send(303, "text/plain", "");
+  if (checkForSPUpdate() == US_AVAILABLE) {
+    doSPUpdate();
+  }
+}
+
+/*
+   INTERRUPT ROUTINES
+*/
+
+void ISR_config() {
+  // Read the config button state to determine if it has been pressed or released
+  btnState = !digitalRead(PIN_CONFIG);
+  // Calculate the last press duration
+  if (btnState) {
+    btnTimer = millis();
+    btnDur = 0;
+  } else {
+    btnDur = millis() - btnTimer;
+    btnTimer = 0;
+    // Discard presses <= 50ms
+    if (btnDur > 50) {
+      btnPressed = 1;
+    } else {
+      btnDur = 0;
+    }
+  }
+}
+
+/*
+   MAIN PROGRAM ROUTINES
+*/
+
+void doWiFiConfigViaWPS() {
+  WiFi.disconnect();
+  WiFi.mode(WIFI_STA);
+  WiFi.beginWPSConfig();
+  while (WiFi.status() != WL_CONNECTED) {
+    blinkLEDLoop(250);
+  }
+  STA_SSID = WiFi.SSID();
+  STA_PASS = WiFi.psk();
+  STA_SETUP = true;
+  saveConfig();
+  for (int i = 0; i < 3; i++) {
+    blinkLEDLoop(125);
+  }
+}
+
+void doWiFiConfigViaAP() {
+  WiFi.disconnect();
+  WiFi.mode(WIFI_AP);
+  WiFi.softAP(AP_SSID.c_str(), AP_PASS.c_str());
+  AP_ACTIVE = true;
+  setLED(1);
+}
+
+UpdateStatus checkForFWUpdate() {
+  /*WiFiClientSecure httpsClient;
+    if (!httpsClient.connect(UPDATE_HOST.c_str(), UPDATE_PORT)) {
+    //Serial.print("connection failed");
+    }
+    httpsClient.println("GET /firmware/wifi_shield/1/firmware.version HTTP/1.1");
+    httpsClient.println("Host: " + UPDATE_HOST);
+    httpsClient.println("Connection: close");
+    httpsClient.println();
+    delay(1000);
+    while (httpsClient.available()) {
+    String line = httpsClient.readStringUntil('\n');
+    Serial.print(line);
+    }
+    return 2;*/
+  String url = UPDATE_URL_BASE + HW_GROUP + "/firmware.version";
+  HTTPClient httpClient;
+  httpClient.begin(url);
+  int httpCode = httpClient.GET();
+  if (httpCode == 200) {
+    String newFWVersion = httpClient.getString();
+    unsigned long newVersion = newFWVersion.toInt();
+    if (newVersion > FW_VERSION ) {
+      return US_AVAILABLE;
+    }
+  } else {
+    return US_FAILED;
+  }
+  return US_NO_UPDATE;
+}
+
+void doFWUpdate() {
+  // Set both LEDs on during update
+  setLED(1);
+  pinMode(2, OUTPUT);
+  digitalWrite(2, LOW);
+  String url = UPDATE_URL_BASE + HW_GROUP + "/firmware.bin";
+  t_httpUpdate_return ret = ESPhttpUpdate.update(url);
+
+}
+
+UpdateStatus checkForSPUpdate() {
+  String url = UPDATE_URL_BASE + HW_GROUP + "/spiffs.version";
+  HTTPClient httpClient;
+  httpClient.begin(url);
+  int httpCode = httpClient.GET();
+  if (httpCode == 200) {
+    String newSPVersion = httpClient.getString();
+    unsigned long newVersion = newSPVersion.toInt();
+    if (newVersion > SP_VERSION ) {
+      return US_AVAILABLE;
+    }
+  } else {
+    return US_FAILED;
+  }
+  return US_NO_UPDATE;
+}
+
+void doSPUpdate() {
+  // Set both LEDs on during update
+  setLED(1);
+  pinMode(2, OUTPUT);
+  digitalWrite(2, LOW);
+  String url = UPDATE_URL_BASE + HW_GROUP + "/spiffs.bin";
+  t_httpUpdate_return ret = ESPhttpUpdate.updateSpiffs(url);
+}
+
+void setup() {
+  pinMode(PIN_STATUS, OUTPUT);
+  pinMode(PIN_CONFIG, INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(PIN_CONFIG), ISR_config, CHANGE);
+
+#ifdef ARDUINO_OTA_ENABLED
+  ArduinoOTA.setHostname("WiFi-Shield");
+  ArduinoOTA.begin();
+#endif
+
+  EEPROM.begin(96); // 96 bytes - 32 for SSID, 64 for PSK
+
+#ifdef INIT_EEPROM
+  reset_EEPROM();
+#endif
+
+  SPIFFS.begin();
+
+  loadConfig();
+
+  if (STA_SETUP) {
+    // WiFi connection has been set up
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(STA_SSID.c_str(), STA_PASS.c_str());
+    wifiTimer = millis();
+    while (WiFi.status() != WL_CONNECTED) {
+      if ((millis() - wifiTimer) > WIFI_TIMEOUT) {
+        wifiTimedOut = true;
+        break;
+      }
+      blinkLEDLoop(250);
+    }
+    if (wifiTimedOut) {
+      // Connection timed out, fall back to AP mode
+      doWiFiConfigViaAP();
+    }
+  } else {
+    // No WiFi connection has yet been set up, enter AP mode
+    doWiFiConfigViaAP();
+  }
+
+  IBISServer.begin();
+
+  server.onNotFound(handleNotFound);
+  server.on("/", handleRoot);
+  server.on("/wifi-setup", handle_wifi_setup);
+  server.on("/check-update", handle_check_update);
+  server.on("/update-fw", handle_update_fw);
+  server.on("/update-sp", handle_update_sp);
+  server.serveStatic("/main.css", SPIFFS, "/main.css");
+  server.serveStatic("/favicon.ico", SPIFFS, "/favicon.ico");
+  server.begin();
+
+  IBIS_init();
+
+  for (int i = 0; i < 3; i++) {
+    blinkLEDLoop(125);
+  }
+
+  if (AP_ACTIVE) {
+    setLED(1);
+  } else {
+    if (checkForFWUpdate()) {
+      doFWUpdate();
+    }
+    if (checkForSPUpdate()) {
+      doSPUpdate();
+    }
+  }
+}
+
+void loop() {
+#ifdef ARDUINO_OTA_ENABLED
+  ArduinoOTA.handle();
+#endif
+  server.handleClient();
+
+  WiFiClient newClient = IBISServer.available();
+  if (newClient) client = newClient;
+  if (client) {
+    while (client.available()) {
+      setLED(1);
+      Serial.write(client.read());
+      setLED(0);
+    }
+  }
+
+  // Handle LED blinking while button is being pressed (visual timing help)
+  if (btnState) {
+    unsigned long dur = (millis() - btnTimer) % 1000;
+    setLED(dur > 500);
+  }
+
+  // Check if the button has been pressed and for how long
+  if (btnPressed) {
+    btnPressed = 0;
+    setLED(0);
+    int selectedOption = btnDur / 1000;
+    switch (selectedOption) {
+      case 0: {
+          // Short press
+          break;
+        }
+      case 1: {
+          // WPS mode
+          doWiFiConfigViaWPS();
+          break;
+        }
+      case 2: {
+          // AP mode
+          doWiFiConfigViaAP();
+          break;
+        }
+      default: {
+          break;
+        }
+    }
+  }
+}
+
diff --git a/data/config.json b/data/config.json
new file mode 100644
index 0000000..05955c8
--- /dev/null
+++ b/data/config.json
@@ -0,0 +1 @@
+{"SPVersion": 1802082058}
\ No newline at end of file
diff --git a/data/favicon.ico b/data/favicon.ico
new file mode 100644
index 0000000..045b6b0
Binary files /dev/null and b/data/favicon.ico differ
diff --git a/data/main.css b/data/main.css
new file mode 100644
index 0000000..998bdfa
--- /dev/null
+++ b/data/main.css
@@ -0,0 +1,8 @@
+body {
+  background-color: #ccc;
+  font-family: sans-serif;
+}
+
+form {
+  margin: 0;
+}
\ No newline at end of file
diff --git a/firmware.bin b/firmware.bin
new file mode 100644
index 0000000..979f70e
Binary files /dev/null and b/firmware.bin differ
diff --git a/firmware.version b/firmware.version
new file mode 100644
index 0000000..f0bd251
--- /dev/null
+++ b/firmware.version
@@ -0,0 +1 @@
+1802080001
\ No newline at end of file
diff --git a/ibis.h b/ibis.h
new file mode 100644
index 0000000..fec5e95
--- /dev/null
+++ b/ibis.h
@@ -0,0 +1,37 @@
+void IBIS_init() {
+  Serial.begin(1200, SERIAL_7E2);
+}
+
+void IBIS_processSpecialCharacters(String* telegram) {
+  telegram->replace("ä", "{");
+  telegram->replace("ö", "|");
+  telegram->replace("ü", "}");
+  telegram->replace("ß", "~");
+  telegram->replace("Ä", "[");
+  telegram->replace("Ö", "\\");
+  telegram->replace("Ü", "]");
+}
+
+String IBIS_wrapTelegram(String telegram) {
+  telegram += '\x0d';
+  unsigned char checksum = 0x7F;
+  for (int i = 0; i < telegram.length(); i++) {
+    checksum ^= (unsigned char)telegram[i];
+  }
+  // Get ready for a retarded fucking Arduino workaround
+  telegram += " ";
+  telegram.setCharAt(telegram.length() - 1, checksum); // seriously fuck that
+  return telegram;
+}
+
+void IBIS_sendTelegram(String telegram) {
+  IBIS_processSpecialCharacters(&telegram);
+  telegram = IBIS_wrapTelegram(telegram);
+  Serial.print(telegram);
+}
+
+void IBIS_DS009(String text) {
+  String telegram = "v" + text;
+  IBIS_sendTelegram(telegram);
+}
+
diff --git a/mkspiffs.exe b/mkspiffs.exe
new file mode 100644
index 0000000..9d589c2
Binary files /dev/null and b/mkspiffs.exe differ
diff --git a/prepare_firmware.py b/prepare_firmware.py
new file mode 100644
index 0000000..b23b945
--- /dev/null
+++ b/prepare_firmware.py
@@ -0,0 +1,25 @@
+"""
+Prepare the firmware image for publishing
+
+- Read Firmware version from code
+- Generate firmware.version file
+- Rename Firmware image
+"""
+
+import os
+import re
+import time
+
+with open("WiFi_Shield.ino", 'r') as f:
+    code = f.read()
+
+match = re.search(r"FW_VERSION = (\d+);", code)
+fw_version = match.group(1)
+
+with open("firmware.version", 'w') as f:
+    f.write(fw_version)
+
+if os.path.exists("WiFi_Shield.ino.generic.bin"):
+    if os.path.exists("firmware.bin"):
+        os.remove("firmware.bin")
+    os.rename("WiFi_Shield.ino.generic.bin", "firmware.bin")
\ No newline at end of file
diff --git a/prepare_spiffs.py b/prepare_spiffs.py
new file mode 100644
index 0000000..436b00f
--- /dev/null
+++ b/prepare_spiffs.py
@@ -0,0 +1,24 @@
+"""
+Prepare the SPIFFS image for publishing
+
+- Set version number in config.json
+- Generate spiffs.version file
+- Build SPIFFS image
+"""
+
+import json
+import os
+import time
+
+with open("data/config.json", 'r') as f:
+    data = json.load(f)
+
+data['SPVersion'] = int(time.strftime("%y%m%d%H%M"))
+
+with open("data/config.json", 'w') as f:
+    json.dump(data, f)
+
+with open("spiffs.version", 'w') as f:
+    f.write(str(data['SPVersion']))
+
+os.system("mkspiffs -c data -p 256 -b 8192 -s 1028096 spiffs.bin")
\ No newline at end of file
diff --git a/spiffs.bin b/spiffs.bin
new file mode 100644
index 0000000..24b16e6
Binary files /dev/null and b/spiffs.bin differ
diff --git a/spiffs.version b/spiffs.version
new file mode 100644
index 0000000..bd0876a
--- /dev/null
+++ b/spiffs.version
@@ -0,0 +1 @@
+1802082058
\ No newline at end of file