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|[[#status|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.

====== runscript ======
Will run script.
Example: runscript?d=C0&s=E%201 
(in this case the script has a space which is replaced with '%20' to comply with http urls standards).

====== set ======
This will allow you to set values in rts2 devices. Modifiers are:
'd': device, 'n': name, 'v': value, 'async': async

====== status ======
get or status are identical.
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