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-The following commands are available with the JSON API:
-|change_constraints|change_script|[[#cmd]]|cnst_alt|cnst_alt_v|
-|cnst_time|consts|create_target|dec|[[#devbytype]]|
-|deviceinfo|[[#devices]]|executor|expose|get|
-|hasimage|inc|labellist|labels|[[#lastimage]]|
-|messages|night|obytid|plan|runscript|
-|satisfied|script|selval|[[#set]]|[[#status]]|
-|sunalt|taltitudes|tbydistance|tbyid|tbylabel|
-|tbyname|tbystring|tlabs_add|tlabs_delete|tlabs_set|
-|[[#update_target]]|violated|
-Info about them can be figured out from the relevant code:
-[[https://github.com/RTS2/rts2/blob/master/src/httpd/httpd.cpp|httpd.cpp]] and [[https://github.com/RTS2/rts2/blob/master/src/httpd/api.cpp|api.cpp]]
-[[https://github.com/RTS2/rts2/blob/master/python/rts2/json.py|json.py]], this last one being the most informative
-====== cmd ======
-This can be used to send commands to the different devices in RTS2.
-For example to observe the target 8 next:
-    http://observatoryserver/apipath/cmd?d=EXEC&c=next%208
-note the URL code %20 is used to pass on the space between the command and the parameters.
-====== devbytype ======
-This will list the devices by type with the modifier being an interger t:
-for example:
-  http://observatoryserver/apipath/devbytype?t=2
-will output mounts attached to this rts2 instance.
-Where the differt device types are:
-|1|SERVERD|9|GRB|21|IMGPROC|
-|2|MOUNT|10|FOCUS|22|SELECTOR|
-|3|CCD|11|MIRROR|23|XMLRPC|
-|4|DOME|12|CUPOLA|24|INDI|
-|5|WEATHER|13|FW|25|LOGD|
-|6|ROTATOR|14|AUGERSH|26|SCRIPTOR|
-|7|PHOT|15|SENSOR| | |
-|8|PLAN|20|EXECUTOR| | |
-====== devices ======
-This will list the devices connected to rts2
-====== lastimage ======
-This theoretically tells you which was the last image to be taken. Using the modifier 'ccd'
-However if this fails (claims not a single image has been taken)
-Looking at the status of the camera device will often state the last_image as a value.
-====== set ======
-This will allow you to set values in rts2 devices. Modifiers are:
-'d': device, 'n': name, 'v': value, 'async': async
-====== status ======
-This will give the values of a specific module. Known modifier is: 'd': device
-====== update_target ======
-This can be used to change values in a target including its coordinates
-    http://observatoryserver/apipath/update_target?id=15&ra=34&dec=-23