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+Commands:
+
+'S' ... enables GFSK test sending mode
+'E' ... enables GFSK test recieving mode
+'B' ... enables Beacon-Mode, i.e. device enters OOK (OnOffKeying) mode and periodically enables the carrier for 1000ms and then pauses for 200ms
+
+S and E can be actived at the same time
+B deactivates S and E
+S or E deactivate B
+
+Each use of S,E or B reinitialize C1101 and thus reset all adjustments.
+
+'R' ... dumps the value of C1101 registers
+
+
+Changing GFSK frequency deviation:
+'D' ... increases GFSK frequency deviation
+'d' ... decreases GFSK frequency deviation
+obviously not much use in Beacon-Mode
+
+
+Using the Beacon Test Mode:
+'B' ... reinitializes C1101 and resets frequency to 435.199677, then starts OOK transmission
+'?' ... shows current frequency
+'#' ... increases frequency by 10 MHz
+'_' ... decreases frequency by 10 MHz
+'+' ... increases frequency by 1 MHz
+'-' ... decreases frequency by 1 MHz
+':' ... increases frequency by 100 KHz
+'.' ... decreases frequency by 100 KHz
+'f' ... sets frequency to previously adjusted valued. e.g. restore frequency after disabling, then reenabling Beacon-Mode 'B'