Add tool to show global state info in GUI

- Can be used to find hostname and IP address of newly added devices.

tasmota/berry/examples/statedata.be

@@ -0,0 +1,62 @@
+# Show hostname and IP address from MQTT STATE messages in GUI
+
+import mqtt 
+import string
+
+class mqttdata_cls
+  var list_buffer                                   # Buffer storing lines
+  var line_cnt                                      # Number of lines
+
+  def init()
+    self.list_buffer = []                           # Init line buffer list
+    self.line_cnt = 10                              # Number of lines to show
+
+    if global.mqttdata_driver
+      global.mqttdata_driver.stop()                 # Let previous instance bail out cleanly
+    end
+    tasmota.add_driver(global.mqttdata_driver := self)
+
+    # Assume default Fulltopic (%prefix%/%topic%/) and Prefix3 (tele)
+    mqtt.subscribe("tele/#", /topic, idx, data, databytes -> self.handle_state_data(topic, idx, data, databytes))
+  end
+
+  def handle_state_data(full_topic, idx, data, databytes)
+    import json
+
+    if string.find(full_topic, "STATE") > 0         # tele/wemos7/STATE
+      var subtopic = string.split(full_topic, "/")  # Assume default Fulltopic (%prefix%/%topic%/)
+      var topic = subtopic[1]                       # wemos7
+
+      var line
+      var state = json.load(data)
+      if state
+        var uptime = state['Uptime']
+        if state.find('Hostname')
+          var hostname = state['Hostname']
+          var ipaddress = state['IPAddress']
+          line = format("<tr><td><a target=_blank href='http://%s.'>%s</a></td><td><a target=_blank href='http://%s'>%s</a></td><td align='right'>%s</td></tr>",
+                         hostname, hostname, ipaddress, ipaddress, uptime)
+        else
+          line = format("<tr><td>%s</td><td>&nbsp</td><td align='right'>%s</td></tr>",
+                         topic, uptime)
+        end
+      end
+      self.list_buffer.push(line)                   # Add as last entry
+      if self.list_buffer.size() > self.line_cnt    # Max number of lines in buffer
+        self.list_buffer.remove(0)                  # Remove first entry
+      end
+    end
+    return true
+  end
+
+  def web_sensor()
+    var msg = format("</table>{t}")                 # Terminate two column table and open new table
+    for i: self.list_buffer.keys()
+      msg += self.list_buffer[i]
+    end
+    msg += "</table>{t}"                            # Terminate three column table and open new table
+    tasmota.web_send(msg)                           # Do not use tasmota.web_send_decimal() which will replace IPAddress dots
+  end
+end
+
+mqttdata = mqttdata_cls()