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+# THIS IS STILL WIP AND THE API IS NOT STABLE MAY NOT EVEN BE IMPLEMENTED
+
+The led of NRF based tags can be controlled by sending a command with the id 100 to the tag.
+
+The led is controlled by the extended command data(12 Bytes)
+
+The first Byte is split into two parts:
+
+the first 4 bits will describe the mode of the led control. The interpretation of the following bytes changes per mode.
+
+the second 4 bytes are the duration of the led flashes in millisecond where 0 is mapped to half a ms and 15 is mapped to no off time. 15 WILL RUIN YOUR BATTERY LIFE. Everything higher than 3ms has a diminishing effect to visibility and 2ms is recommended as the bes compromise between power consumption and visibility.
+
+## MODE 0 normal flashing
+(pwm migh not be possibe)
+Byte 1 Red channel
+Byte 2 Green channel
+Byte 3 Blue channel
+Byte 4 - 7 Time between flashes in ms 
+
+## MODE 1 advanced sequence control 
+
+start of sequence 1
+Byte 1 bit 0 Red channel
+Byte 1 bit 1 Green channel
+Byte 1 bit 2 Blue channel
+Byte 1 bit 3 - 7 time in ms between flashes with a tbd multiplier
+Byte 2 bit 0 - 3 number of repetitions plus 1
+end of sequence 1 
+start of sequence 2
+Byte 2 bit 4 Red channel
+....
+end of sequence 7
+
+Byte 11 bit 4 - 7 delay between restart of the sequence in ms times tbd multiplier, 0 for no repeats 
+
+## MODE 2 - 15 are reserved for future use
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