add a small document describing the use of the control interface
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The osmo-bts control interface is currently supporting the following operations:
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h2. generic
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h3. trx.0.thermal-attenuation
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The idea of this paramter is to attenuate the system output power as part of
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thermal management. In some cases the PA might be passing a critical level,
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so an external control process can use this attribute to reduce the system
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output power.
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<pre>
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bsc_control.py -d localhost -p 4238 -s trx.0.thermal-attenuation 3
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Got message: SET_REPLY 1 trx.0.thermal-attenuation 3
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</pre>
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<pre>
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bsc_control.py -d localhost -p 4238 -g trx.0.thermal-attenuation
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Got message: GET_REPLY 1 trx.0.thermal-attenuation 3
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</pre>
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h2. sysmobts specific
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h3. trx.0.clock-info
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obtain information on the current clock status:
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<pre>
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bsc_control.py -d localhost -p 4238 -g trx.0.clock-info
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Got message: GET_REPLY 1 trx.0.clock-info -100,ocxo,0,0,gps
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</pre>
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which is to be interpreted as:
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* current clock correction value is -100 ppb
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* current clock source is OCXO
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* deviation between clock source and calibration source is 0 ppb
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* resolution of clock error measurement is 0 ppt (0 means no result yet)
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* current calibration source is GPS
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When this attribute is set, any value passed on is discarded, but the clock
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calibration process is re-started.
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h3. trx.0.clock-correction
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This attribute can get and set the current clock correction value:
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<pre>
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bsc_control.py -d localhost -p 4238 -g trx.0.clock-correction
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Got message: GET_REPLY 1 trx.0.clock-correction -100
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</pre>
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<pre>
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bsc_control.py -d localhost -p 4238 -s trx.0.clock-correction -- -99
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Got message: SET_REPLY 1 trx.0.clock-correction success
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</pre>
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