A typical control application usually only needs a variable’s last value, i.e, if you push a virtual switch at Ubidots, you just need to know the last value of the variable related to that switch to take action on any actuators on your side.
https://industrial.api.ubidots.com/api/v1.6/devices/{DEVICE_LABEL}/{VARIABLE_LABEL}/lv
curl -X GET "https://industrial.api.ubidots.com/api/v1.6/devices/my-device/my-variable/lv"
-H "X-Auth-Token: BBFF-Rfcgaxns6HlVb155WA0RhSY85xNDmB"
-H "Content-Type: application/json"
Request
GET /api/v1.6/devices/{DEVICE_LABEL}/{VARIABLE_LABEL}/lv HTTP/1.1<CR><LN>
Host: {Endpoint}<CR><LN>
User-Agent: {USER_AGENT}<CR><LN>
X-Auth-Token: {TOKEN}<CR><LN>
Content-Type: application/json<CR><LN><CR><LN>
Response
HTTP/1.1 200 OK<CR><LN>
Server: nginx<CR><LN>
Date: Tue, 04 Sep 2018 22:35:06 GMT<CR><LN>
Content-Type: application/json<CR><LN>
Transfer-Encoding: chunked<CR><LN>
Vary: Cookie<CR><LN>
Allow: GET, POST, HEAD, OPTIONS<CR><LN><CR><LN>
{PAYLOAD_LENGTH_IN_HEXADECIMAL}<CR><LN>
{LAST_VALUE}<CR><LN>
0<CR><LN>
In the path specified above, replace the {DEVICE_LABEL} and {VARIABLE_LABEL} keys with the unique labels of the Ubidots device and variable you wish to retrieve data from.