PTTLink for TETRA

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Add to rpt.conf the following stanza:

[Events43852]
; RF Transmit
; sudo /usr/local/sbin/PTT-GPIO-high.sh = S|T|RPT_TXKEYED;
; sudo /usr/local/sbin/PTT-GPIO-low.sh = S|F|RPT_TXKEYED;

; RF Transmit
;/home/repeater/tetra_4_PTTLink/PTT-GPIO-lo.sh = S|T|RPT_TXKEYED;
;/home/repeater/tetra_4_PTTLink/PTT-GPIO-hi.sh = S|F|RPT_TXKEYED;

gpio -g write 20 0 = S|T|RPT_TXKEYED;
gpio -g write 20 1 = S|f|RPT_TXKEYED;

; RF Receive
RPT_RXKEYED;

; TETRA_PTT = v|e|${RPT_RXKEYED} & !${RPT_TXKEYED}