diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83b304a91..2af2f675e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
### Added
- ESP32 Extension Manager, replacing loading of Partition Wizard (#23955)
- Berry animation framework web ui to compile DSL (#23962)
+- Berry Devices Online Extension App
### Breaking Changed
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 41f2f7070..6fbe3b7b4 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -135,6 +135,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
- Berry `call()` now works for classes [#23744](https://github.com/arendst/Tasmota/issues/23744)
- Berry multiplication between string and int [#23850](https://github.com/arendst/Tasmota/issues/23850)
- Berry animation framework web ui to compile DSL [#23962](https://github.com/arendst/Tasmota/issues/23962)
+- Berry Devices Online Extension App
### Breaking Changed
- Berry `animate` framework is DEPRECATED, will be replace by `animation` framework [#23854](https://github.com/arendst/Tasmota/issues/23854)
diff --git a/tasmota/berry/extensions/Devices_Online.tapp b/tasmota/berry/extensions/Devices_Online.tapp
new file mode 100644
index 000000000..93468ce38
Binary files /dev/null and b/tasmota/berry/extensions/Devices_Online.tapp differ
diff --git a/tasmota/berry/extensions/Devices_Online/autoexec.be b/tasmota/berry/extensions/Devices_Online/autoexec.be
new file mode 100644
index 000000000..29c20df0a
--- /dev/null
+++ b/tasmota/berry/extensions/Devices_Online/autoexec.be
@@ -0,0 +1,9 @@
+# rm Devices_Online.tapp; zip -j -0 Devices_Online.tapp Devices_Online/autoexec.be Devices_Online/devices_online.be Devices_Online/manifest.json
+do # embed in `do` so we don't add anything to global namespace
+ import introspect
+ var devices_online = introspect.module('devices_online', true) # load module but don't cache
+ tasmota.add_extension(devices_online)
+end
+
+# to remove:
+# tasmota.unload_extension('Devices Online')
diff --git a/tasmota/berry/extensions/Devices_Online/devices_online.be b/tasmota/berry/extensions/Devices_Online/devices_online.be
new file mode 100644
index 000000000..0feba4b9f
--- /dev/null
+++ b/tasmota/berry/extensions/Devices_Online/devices_online.be
@@ -0,0 +1,359 @@
+###################################################################################
+# Display in Main GUI Devices Online based on MQTT Tasmota Discovery Config and STATE reports
+#
+# Copyright (C) 2025 Stephan Hadinger & Theo Arends
+#
+# Enable either
+# line_option = 1 : Scroll 'line_cnt' lines
+# or
+# line_option = 2 : Show devices updating within 'line_teleperiod'
+#
+# rm Devices_Online.tapp; zip -j -0 Devices_Online.tapp Devices_Online/autoexec.be Devices_Online/devices_online.be Devices_Online/manifest.json
+###################################################################################
+
+import mqtt
+import json
+import string
+import webserver
+import persist
+
+class devices_online
+# static var line_option = 1 # Scroll line_cnt lines
+ static var line_option = 2 # Show devices updating within line_teleperiod
+
+ static var line_cnt = 10 # Option 1 number of lines to show
+ static var line_teleperiod = 600 # Option 2 number of teleperiod seconds for devices to be shown as online
+ static var line_highlight = 10 # Highlight latest change duration in seconds
+ static var line_highlight_color = "yellow" # Latest change highlight HTML color like "#FFFF00" or "yellow"
+ static var line_lowuptime_color = "lime" # Low uptime highlight HTML color like "#00FF00" or "lime"
+
+ var mqtt_tele # MQTT tele STATE subscribe format
+ var bool_devicename # Show device name
+ var bool_version # Show version
+ var bool_ipaddress # Show IP address
+ var sort_direction # Sort direction
+ var sort_column # Sort column
+ var sort_last_column # Sort last column
+ var list_buffer # Buffer storing lines
+ var list_config # Buffer storing retained config
+
+ #################################################################################
+ # init
+ #
+ # install the extension and allocate all resources
+ #################################################################################
+ def init()
+ self.bool_devicename = persist.std_devicename # Show device name
+ self.bool_version = persist.std_version # Show version
+ self.bool_ipaddress = persist.std_ipaddress # Show IP address
+
+ self.sort_direction = persist.std_direction # Sort direction (0) Up or (1) Down
+ if !self.sort_direction
+ self.sort_direction = 0 # Default Up
+ end
+ self.sort_column = persist.std_column # Sort column
+ if !self.sort_column
+ self.sort_column = 0 # Default Hostname
+ end
+ self.sort_last_column = self.sort_column # Sort last column to detect direction toggle
+
+ self.list_buffer = [] # Init line buffer list
+ self.list_config = [] # Init retained config buffer list
+
+# var full_topic = tasmota.cmd("FullTopic", true)['FullTopic'] # "%prefix%/%topic%/"
+ var prefix_tele = tasmota.cmd("Prefix", true)['Prefix3'] # tele = Prefix3 used by STATE message
+ self.mqtt_tele = format("%s/#", prefix_tele)
+ mqtt.subscribe(self.mqtt_tele, /topic, idx, data, databytes -> self.handle_state_data(topic, idx, data, databytes))
+ mqtt.subscribe("tasmota/discovery/+/config", /topic, idx, data, databytes -> self.handle_discovery_data(topic, idx, data, databytes))
+
+ tasmota.add_driver(self)
+ end
+
+ #################################################################################
+ # unload
+ #
+ # Uninstall the extension and deallocate all resources
+ #################################################################################
+ def unload()
+ mqtt.unsubscribe("tasmota/discovery/+/config")
+ mqtt.unsubscribe(self.mqtt_tele)
+ tasmota.remove_driver(self)
+ end
+
+ #################################################################################
+ # handle_discovery_data(discovery_topic, idx, data, databytes)
+ #
+ # Handle MQTT Tasmota Discovery Config data
+ #################################################################################
+ def handle_discovery_data(discovery_topic, idx, data, databytes)
+ var config = json.load(data)
+ if config
+ # tasmota/discovery/142B2F9FAF38/config = {"ip":"192.168.2.208","dn":"AtomLite2","fn":["Tasmota",null,null,null,null,null,null,null],"hn":"atomlite2","mac":"142B2F9FAF38","md":"M5Stack Atom Lite","ty":0,"if":0,"cam":0,"ofln":"Offline","onln":"Online","state":["OFF","ON","TOGGLE","HOLD"],"sw":"15.0.1.4","t":"atomlite2","ft":"%prefix%/%topic%/","tp":["cmnd","stat","tele"],"rl":[2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"swc":[-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1],"swn":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"btn":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"so":{"4":0,"11":0,"13":0,"17":0,"20":0,"30":0,"68":0,"73":0,"82":0,"114":0,"117":0},"lk":1,"lt_st":3,"bat":0,"dslp":0,"sho":[],"sht":[],"ver":1} (retained)
+ var topic = config['t']
+ var hostname = config['hn']
+ var ipaddress = config['ip']
+ var devicename = config['dn']
+ var version = config['sw']
+ var line = format("%s\001%s\001%s\001%s\001%s", topic, hostname, ipaddress, devicename, version)
+# tasmota.log(format("STD: 111 Size %03d, Topic '%s', Line '%s'", self.list_config.size(), topic, line), 3)
+ if self.list_config.size()
+ var list_index = 0
+ var list_size = size(self.list_config)
+ var topic_delim = format("%s\001", topic) # Add find delimiter
+ while list_index < list_size # Use while loop as counter is decremented
+ if 0 == string.find(self.list_config[list_index], topic_delim)
+ self.list_config.remove(list_index) # Remove current config
+ list_size -= 1 # Continue for duplicates
+ end
+ list_index += 1
+ end
+ end
+ self.list_config.push(line) # Add (re-discovered) config as last entry
+# tasmota.log(format("STD: 222 Size %03d, Topic '%s', Line '%s'", self.list_config.size(), topic, line), 3)
+ end
+ return true # return true to stop propagation as a Tasmota cmd
+ end
+
+ #################################################################################
+ # handle_state_data(tele_topic, idx, data, databytes)
+ #
+ # Handle MQTT STATE data
+ #################################################################################
+ def handle_state_data(tele_topic, idx, data, databytes)
+ var subtopic = string.split(tele_topic, "/")
+ if subtopic[-1] == "STATE" # tele/atomlite2/STATE
+ var topic = subtopic[1] # Assume default Fulltopic (%prefix%/%topic%/) = tele/atomlite2/STATE = atomlite2
+
+ var topic_index = -1
+ for i: self.list_config.keys()
+ if 0 == string.find(self.list_config[i], topic)
+ topic_index = i
+ break
+ end
+ end
+# tasmota.log(format("STD: Topic '%s', Index %d, Size %d, Line '%s'", topic, topic_index, self.list_config.size(), self.list_config[topic_index]), 3)
+ if topic_index == -1 return true end # return true to stop propagation as a Tasmota cmd
+
+ var state = json.load(data) # Assume topic is in retained discovery list
+ if state # Valid JSON state message
+ var config_splits = string.split(self.list_config[topic_index], "\001")
+ var hostname = config_splits[1]
+ var ipaddress = config_splits[2]
+ var devicename = config_splits[3]
+ var version = config_splits[4]
+
+ # tele/atomlite2/STATE = {"Time":"2025-09-24T14:13:00","Uptime":"0T00:15:09","UptimeSec":909,"Heap":142,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":1,"Berry":{"HeapUsed":12,"Objects":167},"POWER":"OFF","Dimmer":10,"Color":"1A0000","HSBColor":"0,100,10","Channel":[10,0,0],"Scheme":0,"Width":1,"Fade":"OFF","Speed":1,"LedTable":"ON","Wifi":{"AP":1,"SSId":"indebuurt_IoT","BSSId":"18:E8:29:CA:17:C1","Channel":11,"Mode":"HT40","RSSI":100,"Signal":-28,"LinkCount":1,"Downtime":"0T00:00:04"},"Hostname":"atomlite2","IPAddress":"192.168.2.208"}
+ var uptime = state['Uptime'] # 0T00:15:09
+ if state.find('Hostname')
+ hostname = state['Hostname'] # atomlite2
+ ipaddress = state['IPAddress'] # 192.168.2.208
+ end
+ var last_seen = tasmota.rtc('local')
+ var line = format("%s\001%s\001%s\001%d\001%s\001%s", hostname, ipaddress, uptime, last_seen, devicename, version)
+
+ if self.list_buffer.size()
+ var list_index = 0
+ var list_size = size(self.list_buffer)
+ var hostname_delim = format("%s\001", hostname) # Add find delimiter
+ while list_index < list_size # Use while loop as counter is decremented
+ if 0 == string.find(self.list_buffer[list_index], hostname_delim)
+ self.list_buffer.remove(list_index) # Remove current state
+ list_size -= 1 # Continue for duplicates
+ end
+ list_index += 1
+ end
+ end
+ self.list_buffer.push(line) # Add state as last entry
+
+ end
+ end
+ return true # return true to stop propagation as a Tasmota cmd
+ end
+
+ #################################################################################
+ # sort_col(l, col, dir)
+ #
+ # Shell sort list of online devices based on user selected column and direction
+ #################################################################################
+ def sort_col(l, col, dir) # Sort list based on col and Hostname (is first entry in line)
+ # For 50 records takes 6ms (primary key) or 25ms(ESP32S3&240MHz) / 50ms(ESP32@160MHz) (primary and secondary key)
+ var cmp = /a,b -> a < b # Sort up
+ if dir
+ cmp = /a,b -> a > b # Sort down
+ end
+ if col # col is new primary key (not Hostname)
+ for i:l.keys()
+ var splits = string.split(l[i], "\001")
+ l[i] = splits[col] + "\002" + l[i] # Add primary key to secondary key as "col" + Hostname
+ end
+ end
+ for i:1..size(l)-1
+ var k = l[i]
+ var j = i
+ while (j > 0) && !cmp(l[j-1], k)
+ l[j] = l[j-1]
+ j -= 1
+ end
+ l[j] = k
+ end
+ if col
+ for i:l.keys()
+ var splits = string.split(l[i], "\002") # Remove primary key
+ l[i] = splits[1]
+ end
+ end
+ return l
+ end
+
+ #################################################################################
+ # persist_save
+ #
+ # Save user data to be used on restart
+ #################################################################################
+ def persist_save()
+ persist.std_devicename = self.bool_devicename
+ persist.std_version = self.bool_version
+ persist.std_ipaddress = self.bool_ipaddress
+ persist.std_column = self.sort_column
+ persist.std_direction = self.sort_direction
+ persist.save()
+# tasmota.log("STD: Persist saved", 3)
+ end
+
+ #################################################################################
+ # web_sensor
+ #
+ # Display Devices Online in user selected sorted columns
+ #################################################################################
+ def web_sensor()
+ if webserver.has_arg("sd_dn")
+ # Toggle display Device Name
+ if self.bool_devicename self.bool_devicename = false else self.bool_devicename = true end
+ self.persist_save()
+ elif webserver.has_arg("sd_sw")
+ # Toggle display software version
+ if self.bool_version self.bool_version = false else self.bool_version = true end
+ self.persist_save()
+ elif webserver.has_arg("sd_ip")
+ # Toggle display IP address
+ if self.bool_ipaddress self.bool_ipaddress = false else self.bool_ipaddress = true end
+ self.persist_save()
+ elif webserver.has_arg("sd_sort")
+ # Toggle sort column
+ self.sort_column = int(webserver.arg("sd_sort"))
+ if self.sort_last_column == self.sort_column
+ self.sort_direction ^= 1
+ end
+ self.sort_last_column = self.sort_column
+ self.persist_save()
+ end
+
+ if self.list_buffer.size()
+ var now = tasmota.rtc('local')
+ var time_window = now - self.line_teleperiod
+ var list_index = 0
+ var list_size = size(self.list_buffer)
+ while list_index < list_size
+ var splits = string.split(self.list_buffer[list_index], "\001")
+ var last_seen = int(splits[3])
+ if time_window > last_seen # Remove offline devices
+ self.list_buffer.remove(list_index)
+ list_size -= 1
+ end
+ list_index += 1
+ end
+ if !list_size return end # If list became empty bail out
+
+ var msg = "
" # Terminate two column table and open new table
+ msg += "
"
+
+ list_index = 0
+ if 1 == self.line_option
+ list_index = list_size - self.line_cnt # Offset in list using self.line_cnt
+ if list_index < 0 list_index = 0 end
+
+ if self.bool_devicename
+ msg += "
Device Name 
"
+ end
+ if self.bool_version
+ msg += "
Version 
"
+ end
+ msg += "
Hostname 
"
+ if self.bool_ipaddress
+ msg += "
IP Address 
"
+ end
+ msg += "
Uptime 
"
+ else
+ self.sort_col(self.list_buffer, self.sort_column, self.sort_direction) # Sort list by column
+
+ var icon_direction = self.sort_direction ? "▼" : "▲"
+ if self.bool_devicename
+ msg += format("