Querx Firmware

Querx is continually improved by periodic updates. Update your device’s firmware, in order to add new features and correct possible errors.


This tutorial explains how to update the firmware.

Recent Firmware

Version 4.4.27
German, English
  • With Querx TH and Querx THP of hardware version 1.2 it happened that recovery from sporadic sensor errors requires disconnecting the power supply. The error detection and the automatic correction have been improved.
  • An error status is set for the dew point, if temperature or humidity sensors are in error state.
  • Sensor values with extended resolution can now also be requested for Querx PT.
  • DNS packets are checked more thoroughly for plausibility.
  • An incorrect time specification in syslog messages for queries of historical sensor values has been corrected.
Version 5.0.9 Beta
German, English
  • The configuration storage has been completely revised. This means that in the future it should only occur in very rare cases that the configuration is lost during a firmware update.
  • The necessity to reset the configuration or to restart the system to accept the configuration is reported on the web interface.
  • Configurations can optionally be saved with passwords.
  • The chart for Querx CN received numerous fixes and improvements.
  • The color interval of the heatmap has been extended.
  • With Querx WLAN it is possible to use HTTP push via TLS. Additionally, the server certificates for cloud and email servers can be checked to guarantee their authenticity.
  • When testing cloud or e-mail connections, syslog messages are displayed directly on the current Web page.
  • The stability of WLAN connections has been increased by numerous improvements.

Firmware Archive

Version 4.4.25
German, English
  • A manually specified DNS server could have been not used, if a static IP was used. This issue has been corrected.
  • Improved graph support for logging intervals exceeding one minute.
  • Querx Hub can optionally always display sensor values in extended resolution for devices with this firmware.
  • Presentation issues for the heatmap have been corrected.
  • Sending a report email is tried at most three times now.
Version 4.4.23
German, English
  • Support for Querx (WLAN) THP hardware version 1.2.
Version 4.4.21
German, English
  • WLAN networks with a small number of participants no longer lead to incorrectly detected network errors and resulting reboots.
  • Sensor errors only trigger an alarm state after at least one correction attempt failed.
  • False readings could occur after Querx WLAN THP sensor errors. This issue has been corrected.
  • Detection and handling of sensor errors with Querx WLAN THP has been improved.
  • Occasional errors at the right end of the line diagram had been fixed.
Version 4.4.18
German, English
  • Extensive improvements and corrections to the Querx CN chart.
  • The lately implemented extended resolution caused an overflow at temperatures above 327.67°C.
  • Despite activation the conversion of air pressure to sea level has not been calculated since version 4.4.4.
  • A large number of e-mails may have been sent after a time correction.
  • An error in JavaScript could lead to an empty diagram being displayed in the web interface.
  • In the description, absolute and relative air pressure were mixed.
Version 4.4.12
German, English
  • mDNS (Apple Bonjour) did not work anymore since version 4.2. This bug has now been fixed.
  • The support of mDNS can lead to a restart under unknown circumstances. Until the actual error is found and fixed, mDNS and LLMNR can be deactivated in this version. Customers with Apple computers on the network who are observing frequent reboots of their Querx sensors should temporarily disable mDNS in the Querx configuration and access the sensors via its IP address. Note that the changed configuration will be applied only after the next reboot.
  • When restoring older configuration files, the sensor scan could be deactivated. This error was already fixed in version 4.2.17, but had not been included in the current development branch.
Version 4.4.10
German, English
  • Detection of faulty WLAN states and connection recovery had been improved.
  • Querx WLAN was partially restarted when sending emails. This bug has been fixed.
  • The number of jokers in the email text has been increased again from 8 to 10.
  • After aborting SSL connections, the memory used was not always released completely. This bug has been fixed.
  • The Querx WLAN LED flashes yellow if a connection to the WLAN network could not be established despite the WLAN being active.
  • If a WLAN login failed, a new attempt is made after 1 second. Previously the delay had been 10 seconds.
  • After reducing the width of the browser window, some buttons could no longer be clicked. This bug has been fixed.
  • The template for the Palamoa cloud is included in the firmware and does not need to be loaded afterwards.
  • With Querx CN, the current values are displayed correctly again.
Version 4.4.5
German, English
  • The diagrams of the recorded values have been extended. In the line chart you can move back and forth by week, month or year. The heatmap was extended by the selection of weeks and permits the display of minimum and maximum values.
  • Support for MQTT has been added.
  • Subsequently installed content files are displayed in the web interface.
  • Improved maintainability. The last 8 syslog lines can be checked via the web interface. Furthermore, it is possible to transfer all data of one Querx to another one (cloning).
  • Other WLAN devices in the immediate vicinity could sporadically lead to almost complete blocking of data transmission. This condition is now detected and corrected by completely reinitializing the WLAN module.
Version 4.2.20
German, English
  • Improved handling of faulty TH sensors.
  • The temperature conversion errors with extended resolution have been fixed.
  • Errors when uploading cloud templates have been fixed.
  • Querx is restarted reliably after resetting the configuration.
Version 4.2.17
German, English
  • When restoring older configuration files, the sensor scan could be deactivated. This error has been fixed.
  • Capital letters may be used when entering email addresses.
  • Sporadic sensor errors are filtered and no longer produce a large number of alarm messages in harsh environments.
Version 4.2.12
English, German
  • Sending emails sometimes led to a restart. This bug has been fixed.
  • The length of mail server names has been extended to 63 characters.
  • The firmware version had been added to the SNMP sysDescr.
  • Several parts of the function HTTP push had been fixed.
  • Display of recording gaps in the diagram had been improved.
Version 4.2.4
English, German
  • Support for Internet Explorer has been dropped.
  • The web interface’s home page that displays the graphs was redesigned from the ground up.
  • Now offers the possibility to customize the web interface by uploading templates.
  • Cloud support is more expansive and customizable.
  • Sensor values can be adjusted and calibrations can be documented.
  • Support of Querx energy meters.
  • An update from version 3.4 resets Querx to factory settings. Please save your configuration before installing the update.
    The update needs to be installed via an Ethernet connection, since the WiFi configuration is also lost.
Version 3.4.17
English, German
  • Typos had been corrected in the web interface.
Version 3.4.15
English, German
  • The most recent IP-address obtained automatically was contained in the email and zeroconf notifications, if a static IP address is configured.
  • The flashing status display was disabled after a Firefox update.
  • The network mask verification was fixed and reactivated.
  • The function monitoring the WiFi interface caused frequent reboots. The monitoring interval was therefore increased from 1 to 10 minutes. The wired connection is no longer monitored.
  • Sensor values can be adjusted and calibrations can be documented.
Version 3.4.10
English, German
  • The automatic verification of the manual IP configuration, which was introduced in version 3.4, was flawed and has been removed. The error caused the manual configuration to be switched to DHCP after rebooting, if the subnet mask contained byte values other than 255 or 0.
  • The WiFi connection monitor has been improved, in order to detect connection failures earlier.
  • The syslog output prompted by automatic reboots has been expanded.
Version 3.4.7
English, German
  • The recipient’s missing email header was added.
  • The template datalogger.tpl was fixed.
Version 3.4.6
English, German
  • Air pressure sensors are now supported.
  • dweet.io is now supported.
  • Multiple graphs can now be displayed, arranged vertically.
  • The web interface’s layout has been reworked. This affects the graph, including the display of current and recorded values, as well as the admin area.
  • The firmware has been optimized to exploit the hardware more efficiently, which makes the Querx web interface respond to queries more quickly.
  • DHCP communication has been optimized. Amongst other changes, the device will now attempt to establish an IP configuration via DCHP, even if a ZeroConf address has been allocated (if DHCP was not accessible when the device was booted). Additionally, the time it takes Querx to boot under a DHCP configuration has decreased by several seconds.
  • The web interface now exclusively utilizes system fonts. No additional fonts are retrieved from Google any longer.
  • Sporadic sensor errors are reset more reliably and no longer necessarily lead to a reboot.
  • Gaps in the logged data were previously displayed incorrectly. This error has been fixed.
  • When switching from manual to automatic daylight saving time, the active daylight saving time is now displayed without requiring a reboot.
  • It could previously happen that no reboot was performed if several problems that required the device to reboot occurred simultaneously. This issue has been fixed.
  • The logic for the value- and time-axes in the graph has been reworked. Time steps are now displayed correctly, rather than with an offset of one minute as before.
  • An update from version 3.2 resets Querx to factory settings. Please save your configuration before installing the update.
    The update needs to be installed via an Ethernet connection, since the WiFi configuration is also lost.
Version 3.2.19
English, German
  • The firmware version had been added to the SNMP sysDescr.
Version 3.2.18
English, German
  • The recipient’s missing email header was added.
  • The template datalogger.tpl was fixed.
  • An error concerning the update of sensor values in the web interface was fixed.
Version 3.2.16
English, German
  • Due to a bug in the filtering of Querx WLAN PT100 and PT1000, momentary changes may not have appeared in the output, although they had been properly logged.
Version 3.2.15
English, German
  • After restart, sporadic sensor failures had been observed on some Querx WLAN TH, which could be resolved only by a short disconnection of the power supply. This error has been fixed.
Version 3.2.13
English, German
  • Humidity values over 100% could be recorded after a previous fix. This issue has been resolved.
  • After deleting the history, it could take up to an hour for new data to be displayed in the graph. This bug has been fixed.
  • Underscores are now accepted in the titles of SNMP communities. The length remains limited to 15 characters.
Version 3.2.11
English, German
  • Querx PT and Querx WLAN PT sensor errors are now reset correctly. Sporadic sensor errors are therefore no longer logged as events.
  • The outliers saved by previous versions of the Querx PT firmware can be removed from the logged data by applying a filter (admin/filter.cgi).
  • The output of mDNS- and LLMNR-messages via Syslog has been deactivated.
Version 3.2.10
English, German
  • The Paessler MIB Importer’s sensor table was not recognized due to an error in the SNMP MIB.
  • Sporadic Pt100- or Pt1000-sensor errors were occasionally recognized too late, leading to wrong values being processed.
  • Drop-outs while saving the device’s configuration could cause the settings to get lost. In some cases Querx was no longer reachable due to faulty network settings. Time monitoring while saving the configuration has been updated and the network settings are additionally checked and restored, if necessary.
Version 3.2.8
English, German
  • Sending emails now supports the older authentication AUTH-LOGIN, in addition to AUTH-PLAIN. Microsoft Exchange servers, in particular, insist on this older procedure.
  • The Ethernet communication of Querx TH and Querx PT has been optimized.
  • The transfer of logged data has been optimized.
  • Errors sporadically occurring on Pt-sensors are ignored. An error must persist for at least ten seconds, in order for it to be registered as a sensor error.
  • The system only attempts to switch to encrypted email transfer if the server supports the STARTTLS service.
  • No EHLO/HELO was sent to the email server if authentication was deactivated. This bug has been fixed.
  • Rare circumstances could lead to the WiFi connection getting jammed. An additional control process notices this problem and reboots the system.
  • Device Discoverer now displays the current IP-address instead of the configured address.
Version 3.2.7
English, German
  • Gaps in the recorded data are no longer highlighted as noticeably in the graph.
  • The DNS-Server’s IP-address can now be set via DHCP, even if the device’s IP-address is static.
  • Sending emails from Querx TH and Querx PT to certain mail servers failed and resulted in the device rebooting. This issue has been fixed.
  • The last entry was sometimes repeated with a wrong value in the diagram. This bug has been fixed.
  • Resetting the configuration to the factory settings changed the diagram’s colors. This bug has been fixed.
  • Recognizing sensor errors was unreliable on Querx WLAN TH. This issue has been resolved.
Version 3.2.4
English, German
  • The graph can now display the last 7 days, starting on any day of the week.
  • Gaps in the recorded data are displayed more noticeably in the graph.
  • The data logger’s compression can be switched off and is deactivated in the default settings.
  • The diagram can no longer be set to display a bar graph.
  • The device monitors its internal operation more reliably, resulting in more dependable reboots in the case of malfunctions.
Version 3.0.5
English, German
  • Under certain circumstances, the diagram on the homepage would only show individual values, displaying the graph incorrectly. This issue has been resolved.
Version 3.0.4
English, German
  • If WiFi is configured but the connection has failed and no Ethernet link is available, Querx will restart within approximately 5 minutes to react to the new network environment. If Querx WLAN is operated without an Ethernet cable, the WiFi interface needs to be deactivated to prevent the device from rebooting.
  • The internal multitasking memory has been slightly increased to provide sufficient memory reserves.
  • It could previously happen that Querx could no longer react to network queries if the memory was full after the device had run for a longer period and several MDNS-queries had been received in one package. This issue has been resolved.
  • The WiFi communication is more reliable if the signal is bad.
  • The selected update rate for the cloud service is taken into account.
  • IPv6 queries (type AAAA) via LLMNR are answered correctly.
Version 3.0.2
English, German
  • Issues with the cloud service updates have been resolved.
Version 3.0.1
English, German
  • The firmware provided with Querx WLAN TH caused long delays when responding to queries via Modbus/TCP. This issue has been resolved.
Version 3.0.0
English, German
  • The web interface has been restructured.
  • WiFi connection is now supported in addition to the wired Ethernet connection.
  • The web interface supports encrypted access via HTTPS. A good wireless connection is required for encrypted access to work via WiFi.
  • Diagram: The displayed timeframe can be set to a week, a month or a year. The displayed range of values can be configured. Gaps in the recorded data are displayed as gaps in the graph.
  • Localization: The language can be switched to English or German. Therefore, only one version of the firmware is required for both languages. The date`s format can be changed.
  • Events and email: Additional placeholders make it possible to incorporate a event’s date, time and text into email notifications. The events’ texts can be personalized.
  • Data logger: The logging rate can be set in intervals of minutes, making it possible to increase the timeframe the logger can track.
  • Cloud: The refresh rate can be configured in intervals of minutes. A test button makes it possible to check the connection.
  • An update from version 2 to version 3 resets Querx to factory settings. Please save your configuration before installing the update.
Version 2.2.5
English, German
  • The timeout when sending emails has been increased from 5 to 60 seconds.
  • Sending emails without authentication now functions correctly.
Version 2.2.2
English, German
  • If IGMP-queries were continuously sent in the local network, it could happen that the device was no longer reachable after a few hours, due to a lack of system memory. This issue has been resolved.
  • The correction of negative dew-point limits has now been integrated into the English version.
  • Errors when querying current data were only corrected in the German version. This feature has now been integrated into the English version.
  • The graph was no longer displayed after the humidity sensor’s name was changed in the English version. This bug has been fixed.
Version 2.2.1
English, German
  • The web interface is now also available in German.
  • When exporting data in the JSON-format, a superfluous comma was added after the last entry. This comma has been removed.
  • The dew point sensor's missing name was added to the XML data export feature.
  • The graph was no longer displayed after changing the sensor’s name. This bug has been fixed.
  • Dew point threshold values can now be negative.
  • Entering long email texts unintentionally changed other settings. This bug has been fixed.
  • Emails now include the correct timestamp without requiring a reboot after changing the time zone or daylight saving time settings.
Version 2.1.2
  • The current values can now be retrieved in the XML, JSON and CSV formats via HTTP.
  • Blank entries would sometimes be generated, when exporting recorded data. This bug has been fixed.
  • The system is no longer obstructed when displaying the diagram and at every full minute.
  • The DHCP query has been optimized and works more reliably after changing the network.
  • Querx was no longer recognized by Device Discoverer after changing the IP-subnetmask. This bug has been fixed.
  • The unit-ID had to be set to 1, when communicating via Modbus/TCP. As of the current version, any ID is accepted, but the ID 255 is recommended.
  • An update from version 1 to version 2 resets Querx to factory settings. Please save your configuration before installing the update.
Version 1.3.2
  • Emails can now be encrypted using StartTLS.
  • SNMPv1 can be used to retrieve data via network management systems.
  • Modbus/TCP can be used to integrate the device into technical processes/SCADA.
  • The diagram showed the months from 0-11 instead of 1-12. This bug has been fixed.