diff --git a/CHANGELOG.md b/CHANGELOG.md
index f20a6fd68..002068d7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 ### Breaking Changed
 
 ### Changed
+- Sensirion_Core library from v0.7.2 to arduino-core v0.7.3
 - SCD30 library FrogmoreScd30 to Sensirion arduino-i2c-scd30 v1.1.1
 - SCD4x library FrogmoreScd40 to Sensirion arduino-i2c-scd4x v1.1.0
 - SPS30 library Sensirion arduino-i2c-sps30 v1.0.1
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index daf97f317..e3eade63c 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
 
 ### Changed
 - ESP32 Platform from 2025.04.30 to 2026.05.50, Framework (Arduino Core) from v3.1.11 to v3.3.8.260506 and IDF from v5.3.4.260127 to v5.5.4.260407 [#24718](https://github.com/arendst/Tasmota/issues/24718)
+- Sensirion_Core library from v0.7.2 to arduino-core v0.7.3
 - SCD30 library FrogmoreScd30 to Sensirion arduino-i2c-scd30 v1.1.1
 - SCD4x library FrogmoreScd40 to Sensirion arduino-i2c-scd4x v1.1.0
 - SPS30 library Sensirion arduino-i2c-sps30 v1.0.1
diff --git a/lib/lib_i2c/Sensirion_Core/.clang-format b/lib/lib_i2c/arduino-core/.clang-format
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/.clang-format
rename to lib/lib_i2c/arduino-core/.clang-format
diff --git a/lib/lib_i2c/Sensirion_Core/.editorconfig b/lib/lib_i2c/arduino-core/.editorconfig
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/.editorconfig
rename to lib/lib_i2c/arduino-core/.editorconfig
diff --git a/lib/lib_i2c/Sensirion_Core/.gitignore b/lib/lib_i2c/arduino-core/.gitignore
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/.gitignore
rename to lib/lib_i2c/arduino-core/.gitignore
diff --git a/lib/lib_i2c/Sensirion_Core/CHANGELOG.rst b/lib/lib_i2c/arduino-core/CHANGELOG.rst
similarity index 97%
rename from lib/lib_i2c/Sensirion_Core/CHANGELOG.rst
rename to lib/lib_i2c/arduino-core/CHANGELOG.rst
index ebbf80d6e..a234b6937 100644
--- a/lib/lib_i2c/Sensirion_Core/CHANGELOG.rst
+++ b/lib/lib_i2c/arduino-core/CHANGELOG.rst
@@ -9,6 +9,12 @@ and this project adheres to `Semantic Versioning <https://semver.org/spec/v2.0.0
 `Unreleased`_
 -------------
 
+
+`0.7.3`_ 2026-02-11
+-------------------
+
+- Fix bug in ``SensirionShdlcTxFrame::begin`` that caused communication timeouts.
+
 `0.7.2`_ 2025-11-04
 -------------------
 
diff --git a/lib/lib_i2c/Sensirion_Core/LICENSE b/lib/lib_i2c/arduino-core/LICENSE
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/LICENSE
rename to lib/lib_i2c/arduino-core/LICENSE
diff --git a/lib/lib_i2c/Sensirion_Core/README.md b/lib/lib_i2c/arduino-core/README.md
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/README.md
rename to lib/lib_i2c/arduino-core/README.md
diff --git a/lib/lib_i2c/Sensirion_Core/examples/AllCommandsI2c/AllCommandsI2c.ino b/lib/lib_i2c/arduino-core/examples/AllCommandsI2c/AllCommandsI2c.ino
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/examples/AllCommandsI2c/AllCommandsI2c.ino
rename to lib/lib_i2c/arduino-core/examples/AllCommandsI2c/AllCommandsI2c.ino
diff --git a/lib/lib_i2c/Sensirion_Core/examples/AllCommandsShdlc/AllCommandsShdlc.ino b/lib/lib_i2c/arduino-core/examples/AllCommandsShdlc/AllCommandsShdlc.ino
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/examples/AllCommandsShdlc/AllCommandsShdlc.ino
rename to lib/lib_i2c/arduino-core/examples/AllCommandsShdlc/AllCommandsShdlc.ino
diff --git a/lib/lib_i2c/Sensirion_Core/keywords.txt b/lib/lib_i2c/arduino-core/keywords.txt
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/keywords.txt
rename to lib/lib_i2c/arduino-core/keywords.txt
diff --git a/lib/lib_i2c/Sensirion_Core/library.properties b/lib/lib_i2c/arduino-core/library.properties
similarity index 97%
rename from lib/lib_i2c/Sensirion_Core/library.properties
rename to lib/lib_i2c/arduino-core/library.properties
index 74aa592de..81be39de8 100644
--- a/lib/lib_i2c/Sensirion_Core/library.properties
+++ b/lib/lib_i2c/arduino-core/library.properties
@@ -1,5 +1,5 @@
 name=Sensirion Core
-version=0.7.2
+version=0.7.3
 author=Sensirion
 maintainer=Sensirion
 sentence=Library containing code base for Sensirion Sensor Libraries.
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionCore.h b/lib/lib_i2c/arduino-core/src/SensirionCore.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionCore.h
rename to lib/lib_i2c/arduino-core/src/SensirionCore.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionCoreArduinoLibrary.h b/lib/lib_i2c/arduino-core/src/SensirionCoreArduinoLibrary.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionCoreArduinoLibrary.h
rename to lib/lib_i2c/arduino-core/src/SensirionCoreArduinoLibrary.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionCrc.cpp b/lib/lib_i2c/arduino-core/src/SensirionCrc.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionCrc.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionCrc.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionCrc.h b/lib/lib_i2c/arduino-core/src/SensirionCrc.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionCrc.h
rename to lib/lib_i2c/arduino-core/src/SensirionCrc.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionErrors.cpp b/lib/lib_i2c/arduino-core/src/SensirionErrors.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionErrors.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionErrors.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionErrors.h b/lib/lib_i2c/arduino-core/src/SensirionErrors.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionErrors.h
rename to lib/lib_i2c/arduino-core/src/SensirionErrors.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionI2CCommunication.cpp b/lib/lib_i2c/arduino-core/src/SensirionI2CCommunication.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionI2CCommunication.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionI2CCommunication.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionI2CCommunication.h b/lib/lib_i2c/arduino-core/src/SensirionI2CCommunication.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionI2CCommunication.h
rename to lib/lib_i2c/arduino-core/src/SensirionI2CCommunication.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionI2CRxFrame.h b/lib/lib_i2c/arduino-core/src/SensirionI2CRxFrame.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionI2CRxFrame.h
rename to lib/lib_i2c/arduino-core/src/SensirionI2CRxFrame.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionI2CTxFrame.cpp b/lib/lib_i2c/arduino-core/src/SensirionI2CTxFrame.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionI2CTxFrame.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionI2CTxFrame.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionI2CTxFrame.h b/lib/lib_i2c/arduino-core/src/SensirionI2CTxFrame.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionI2CTxFrame.h
rename to lib/lib_i2c/arduino-core/src/SensirionI2CTxFrame.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionRxFrame.cpp b/lib/lib_i2c/arduino-core/src/SensirionRxFrame.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionRxFrame.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionRxFrame.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionRxFrame.h b/lib/lib_i2c/arduino-core/src/SensirionRxFrame.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionRxFrame.h
rename to lib/lib_i2c/arduino-core/src/SensirionRxFrame.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcCommunication.cpp b/lib/lib_i2c/arduino-core/src/SensirionShdlcCommunication.cpp
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionShdlcCommunication.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionShdlcCommunication.cpp
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcCommunication.h b/lib/lib_i2c/arduino-core/src/SensirionShdlcCommunication.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionShdlcCommunication.h
rename to lib/lib_i2c/arduino-core/src/SensirionShdlcCommunication.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcRxFrame.h b/lib/lib_i2c/arduino-core/src/SensirionShdlcRxFrame.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionShdlcRxFrame.h
rename to lib/lib_i2c/arduino-core/src/SensirionShdlcRxFrame.h
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcTxFrame.cpp b/lib/lib_i2c/arduino-core/src/SensirionShdlcTxFrame.cpp
similarity index 99%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionShdlcTxFrame.cpp
rename to lib/lib_i2c/arduino-core/src/SensirionShdlcTxFrame.cpp
index 693c030c4..42cb1e414 100644
--- a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcTxFrame.cpp
+++ b/lib/lib_i2c/arduino-core/src/SensirionShdlcTxFrame.cpp
@@ -39,7 +39,7 @@
 uint16_t SensirionShdlcTxFrame::begin(uint8_t command, uint8_t address,
                                       uint8_t dataLength) {
     _index = 0;  // sets the index to point towards the start of the buffer.
-    _buffer[_index] = 0x7e;
+    _buffer[_index++] = 0x7e;
     uint16_t error = addUInt8(address);
     error |= addUInt8(command);
     error |= addUInt8(dataLength);
diff --git a/lib/lib_i2c/Sensirion_Core/src/SensirionShdlcTxFrame.h b/lib/lib_i2c/arduino-core/src/SensirionShdlcTxFrame.h
similarity index 100%
rename from lib/lib_i2c/Sensirion_Core/src/SensirionShdlcTxFrame.h
rename to lib/lib_i2c/arduino-core/src/SensirionShdlcTxFrame.h