Enhance the KNX capabilities of Tasmota to offer more flexibility and features.

[pbrinette]

Description: Enhance the KNX capabilities of Tasmota to offer more flexibility and features.

Summary of Changes

• Added new KnxTx functions.
• Extended the number of KNX user-defined slots from 5 to 9.
• Added a compilation flag to let users decide if Temperature/Humidity sensors communicate on group addresses in 16-bit float (DPT 9.x) or 32-bit float (DPT 14.x).

1. Add New KnxTx Functions

KnxTx_Float : Sends float values in DPT 9 format (16 bits)
KnxTx_Double : Sends float values in DPT 14 format (32 bits), an alias of KnxTx_Val
KnxTx_Byte : Sends integer values in DPT 5 format (8 bits unsigned)

2. Extend the Number of KNX User-Defined Slots

By default, only 5 RX and TX slots are available to users. I’ve extended this to 9 slots.

Use Case Example:

I use an eWeLink Zigbee Gateway connected to 3 SNZB Temperature and Humidity sensors. I’ve configured Tasmota to send temperature/humidity KNX values on ZbReceived values using rules. Extending the number of slots allows me to use up to 4 such devices.

Rule Example Configuration:

Rule
  on ZbReceived#0x5E17#humidity do knxtx_Float1 %value% endon
  on ZbReceived#0x5E17#temperature do knxtx_Float2 %value% endon
  on ZbReceived#0xF658#humidity do knxtx_Float3 %value% endon
  on ZbReceived#0xF658#temperature do knxtx_Float4 %value% endon
  on ZbReceived#0x1371#humidity do knxtx_Float5 %value% endon
  on ZbReceived#0x1371#temperature do knxtx_Float6 %value% endon
Rule1 1 

Add Compilation Flag to Select DPT9 Instead of DPT14 for Temperature/Humidity Sensors

Most older KNX equipment uses DPT 9 (16-bit float) for communication objects for Temperature / Humidity instead of DPT 14 (32-bit float). The compilation flag KNX_USE_DPT9 allows users to select DPT 9 for sending and receiving temperature and humidity data.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.7
• The code change is tested and works with Tasmota core ESP32 V.3.0.4
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass