Rename UNKNOWN to SET_ON_TEACH_PENDANT

This way it is more explicit what is actually happening.

include/ur_client_library/rtde/rtde_writer.h

@@ -120,13 +120,13 @@ class RTDEWriter
    * \param output_pin The pin to change
    * \param value The new value, it should be between 0 and 1, where 0 is 4mA and 1 is 20mA.
    * \param type The domain for the output can be eitherAnalogOutputType::CURRENT or  AnalogOutputType::VOLTAGE or
-   * AnalogOutputType::UNKNOWN. In the latter case the domain is left untouched and the domain configured on the teach
-   * pendant will be used.
+   * AnalogOutputType::SET_ON_TEACH_PENDANT. In the latter case the domain is left untouched and the domain configured
+   * on the teach pendant will be used.
    *
    * \returns Success of the package creation
    */
   bool sendStandardAnalogOutput(uint8_t output_pin, double value,
-                                const AnalogOutputType type = AnalogOutputType::UNKNOWN);
+                                const AnalogOutputType type = AnalogOutputType::SET_ON_TEACH_PENDANT);
 
   /*!
    * \brief Creates a package to request setting a new value for an input_bit_register

include/ur_client_library/ur/datatypes.h

@@ -81,7 +81,7 @@ enum class SafetyStatus : int8_t  // Only available on 3.10/5.4
 
 enum class AnalogOutputType : int8_t
 {
-  UNKNOWN = -1,
+  SET_ON_TEACH_PENDANT = -1,
   CURRENT = 0,
   VOLTAGE = 1
 };

src/rtde/rtde_writer.cpp

@@ -226,7 +226,7 @@ bool RTDEWriter::sendStandardAnalogOutput(uint8_t output_pin, double value, cons
 
   bool success = true;
   success = package_.setData("standard_analog_output_mask", mask);
-  if (type != AnalogOutputType::UNKNOWN)
+  if (type != AnalogOutputType::SET_ON_TEACH_PENDANT)
   {
     auto output_type_bits = [](const uint8_t pin, const uint8_t type) { return type << pin; };
     uint8_t output_type = output_type_bits(output_pin, toUnderlying(type));