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+---
+edit_link: ''
+title: Signal Composer API
+origin_url: >-
+  https://git.automotivelinux.org/apps/agl-service-signal-composer/plain/docs/part-1/4-SignalComposerAPI.md?h=master
+---
+
+<!-- WARNING: This file is generated by fetch_docs.js using /home/boron/Documents/AGL/docs-webtemplate/site/_data/tocs/apis_services/master/agl-service-signal-composer-developer-guides-api-services-book.yml -->
+
+# Signal Composer API
+
+## subscribe/unsubscribe
+
+Using subscribe you can get update on change for signals you chose and you can
+using wildcard to subscribe several signals in the same time.
+
+```json
+signal-composer subscribe {"signal": "rear_left*"}
+ON-REPLY 1:signal-composer/subscribe: {"jtype":"afb-reply","request":{"status":"success","uuid":"3d4b743b-7ac6-4d3c-8fce-721107f9dee5"}}
+```
+
+Then event comes up like the following:
+
+```json
+ON-EVENT signal-composer/257b343e-8ea9-4cd7-8f9e-1904fa77f8f2({"event":"signal-composer\/257b343e-8ea9-4cd7-8f9e-1904fa77f8f2","data":{"uid":"rear_left_door","event":"low-can\/messages.doors.rear_left.open","timestamp":4833910845032292484,"value":false},"jtype":"afb-event"})
+```
+
+Unsubscribe happens the same way. When no more signals are holded by the client
+then it unsubscribe from the *AGL Application Framework* event handle.
+
+## addObjects
+
+Let you add sources or signals objects to the signal composer service after
+its initialization phase. Use this verb and specify the file as argument, you
+could use only the file name or the file name with its absolute path.
+
+```json
+signal-composer addObjects {"file": "sig_doors.json"}
+ON-REPLY 1:signal-composer/addObjects: {"jtype":"afb-reply","request":{"status":"success","uuid":"00d7a519-816e-486a-8163-3afb1face4fa"}}
+signal-composer addObjects {"file": "/tmp/sig_doors.json"}
+ON-REPLY 2:signal-composer/addObjects: {"jtype":"afb-reply","request":{"status":"success"}}
+```
+
+You can follow the activity using the service log journal and check that the
+correct number of objects has been added.
+
+> **CAUTION**: You need to get the following permission to be able to load new
+objects : `urn:AGL:permission::platform:composer:addObjects`
+
+## get
+
+You can get a signal value be requesting the API with the verb *get*:
+
+```json
+signal-composer get {"signal": "vehicle_speed", "options": {"average": 10}}
+signal-composer get {"signal": "vehicle_speed", "options": {"minimum": 10}}
+signal-composer get {"signal": "vehicle_speed", "options": {"maximum": 10}}
+signal-composer get {"signal": "vehicle_speed"}
+```
+
+You apply some simple mathematical functions by default present in the
+binding, by default **last** is used:
+
+- **average**: make an average on X latest seconds.
+- **minimum**: return the minimum value found in the X latest seconds.
+- **maximum**: return the maximum value found in the X latest seconds.
+- **last**: return the latest value.
+
+## list
+
+Verb **list** will output the list of defined signals.