Downloads

v1.75 (Jan. 13, 2026)

Filename: lc39_v1_75.bin (653.1 KB)

Added

• New authentication system.
  • Login on the web interface is integrated with Basic Authentication. Previously, there were two login forms — one handled by the browser using Basic Authentication and another on the Login page.
  • Basic Authentication is enabled by default.
  • With default settings, i.e. with Basic Authentication enabled, access credentials are properly protected. An issue was removed where a user could read admin credentials.
    Please note that the admin/user separation previously served only a visual purpose and did not provide real access control. It now fulfills both roles — providing access to a simplified view for user and a full configuration view for admin, with proper separation of access rights to resources.
  • The user account and additional accounts for controlling outputs cannot send multiple commands in a single request, e.g., /outs.cgi?out0=1&out1=1. Instead, use two commands, e.g., /outs.cgi?out0=1 and /outs.cgi?out1=1.

Changed

• UI:
  • Removal of the automatic login feature due to incompatibility with the new authentication system.

Fixed

• Reading the SCD40 sensor.
• Deleting entries in the Scheduler. Since SW 1.70, entries could no longer be deleted, but they could be edited/disabled.
• Extending the MQTT ID from 6 to 8 characters. In test data, we observed duplicate identifiers at 6 characters long, which could result in MQTT clients disconnecting from each other when attempting to connect to the same server from two LKs with the same ID. This change addresses this issue.
• UI:
  • Links on the Support page led to LK3.5+ pages instead of LK3.9.
  • Validation of upper limits in the Watchdog form.
  • Other minor fixes and improvements.

v1.71 (July 8, 2025)

Filename: lc39_v1_71.bin (644.2 KB)

Fixed

• Reading negative values for data types int16 and int32 in Modbus RTU.

v1.70 (April 11, 2025)

Filename: lc39_v1_70.bin (644.2 KB)

Added

• Support for ACD10 sensor (CO2).
• Support for APM10 sensor (PM1.0/2.5/4.0/10.0).

Changed

• Saving E-mail texts in multiple variables e_81 - e_88 instead of single em8 (with long texts it resulted in saving errors).
• Extended MQTT topic prefix from 14 characters to 32.

Fixed

• Saving DS sensor calibration (lost after restart).
• Reading parameters m1 - m30 from Modbus TCP server (no data for m13+).
• Parameter addresses in Modbus TCP server (addresses shifted by -1).
• Sending SNMP Trap (badly formatted packet).
• MQTT operation in the Events function (for some sources incorrect data was sent; for pwm1 and pwm2 it resulted in device restart).
• Periodic switching function of OUT outputs (on/off times could be swapped depending on the output state at the time of function activation).
• Saving Email settings (texts with reading codes could be written incorrectly - conversion ! to %).
• UI:
  • Shortcut to open the edit window for the currently selected custom device configuration in the Extras section in the Modbus modules table.
  • Automatic selection of the first available option in the copy/clone function in the Events and Scheduler functions.
  • Support for long commands to LK from the page (limit of 666 characters).

v1.68 (Dec. 13, 2024)

Filename: lc39_v1_68.bin (642.3 KB)

Fixed

• Changing voltage ranges for analog inputs.
• UI:
  • Validation of the restart limit field in Watchdog (0 allowed).
  • Validation of the time field for the Set the output after starting function (maximum 65535).
  • Displaying the names of mapped readings (more detailed).
  • Ability to change the DS name in the I2C and 1-Wire sensors tab.
  • URL validation in the HTTP client allows entering : in the path.

v1.67 (Dec. 11, 2024)

Filename: lc39_v1_67.bin (642.1 KB)

Fixed

• Improved reading from analog inputs.

v1.66 (Dec. 3, 2024)

Filename: lc39_v1_66.bin (642.9 KB)

Fixed

• Reading the processor temperature (board temperature).
• ICMP support.

v1.65 (Nov. 26, 2024)

Filename: lc39_v1_65.bin (642.5 KB)

Fixed

• Data returned in response to a Discovery query.

v1.64 (Nov. 22, 2024)

Filename: lc39_v1_64.bin (642.6 KB)

Initial release