Add Arduino rewrite of firmware

firmware/cities.py

@@ -0,0 +1,42 @@
+import requests
+import csv
+
+# Looks like ESP-IDF pulls in whole POSIX stack
+# Some forums mention ESP-IDF uses this CSV
+
+coords = {}
+
+r = requests.get("https://gist.githubusercontent.com/erdem/8c7d26765831d0f9a8c62f02782ae00d/raw/248037cd701af0a4957cce340dabb0fd04e38f4c/countries.json")
+data = r.json()
+for j in data:
+    for tz in j["timezones"]:
+        coords[tz] = j["latlng"]
+
+
+r = requests.get("https://raw.githubusercontent.com/nayarsystems/posix_tz_db/master/zones.csv")
+cr = csv.reader(r.text.splitlines(), delimiter=',', quotechar='"')
+
+print("""const char cities[] = R"(
+<br/>
+<label for="city">Nearest city</label>
+<select name="city" id="city" onchange="
+document.getElementById('timezone').value = this.value;
+document.getElementById('long').value = this.options[this.selectedIndex].dataset.long;
+document.getElementById('lat').value = this.options[this.selectedIndex].dataset.lat;
+">""")
+for name, code in cr:
+    if name.startswith("Etc/"):
+        continue
+    if not name.startswith("Europe/"):
+        continue
+    longlat = coords.get(name)
+    selected = name == "Europe/Tallinn"
+    print("""<option value="%s" data-long="%s" data-lat="%s"%s>%s</option>""" % (
+        code,
+        int(longlat[0]) if longlat else "",
+        int(longlat[1]) if longlat else "",
+        " selected" if selected else "",
+        name))
+print("""</select>
+)";
+""")