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diff --git a/docs/3-Usage.md b/docs/3-Usage.md index fa2991c..ba2c63f 100644 --- a/docs/3-Usage.md +++ b/docs/3-Usage.md @@ -237,6 +237,40 @@ low-can subscribe {"event": "messages.engine.load", "filter": { "min": 30, "max" low-can subscribe {"event": "messages.vehicle.speed", "filter": { "frequency": 2}} ``` +## Get last signal value and list of configured signals + +You can also ask for a particular signal value on one shot using **get** verb, like +this: + +```json +low-can get {"event": "messages.engine.speed"} +ON-REPLY 1:low-can/get: {"response":[{"event":"messages.engine.speed","value":0}],"jtype":"afb-reply","request":{"status":"success"}} +``` + +> **CAUTION** Only one event could be requested. + +Also, if you want to know the supported CAN signals loaded by **low-can**, use verb +**list** + +```json +low-can list +ON-REPLY 2:low-can/list: {"response":["messages.hvac.fan.speed","messages.hvac.temperature.left","messages.hvac.temperature.right","messages.hvac.temperature.average","messages.engine.speed","messages.fuel.level.low","messages.fuel.level","messages.vehicle.average.speed","messages.engine.oil.temp","messages.engine.oil.temp.high","messages.doors.boot.open","messages.doors.front_left.open","messages.doors.front_right.open","messages.doors.rear_left.open","messages.doors.rear_right.open","messages.windows.front_left.open","messages.windows.front_right.open","messages.windows.rear_left.open","messages.windows.rear_right.open","diagnostic_messages.engine.load","diagnostic_messages.engine.coolant.temperature","diagnostic_messages.fuel.pressure","diagnostic_messages.intake.manifold.pressure","diagnostic_messages.engine.speed","diagnostic_messages.vehicle.speed","diagnostic_messages.intake.air.temperature","diagnostic_messages.mass.airflow","diagnostic_messages.throttle.position","diagnostic_messages.running.time","diagnostic_messages.EGR.error","diagnostic_messages.fuel.level","diagnostic_messages.barometric.pressure","diagnostic_messages.ambient.air.temperature","diagnostic_messages.commanded.throttle.position","diagnostic_messages.ethanol.fuel.percentage","diagnostic_messages.accelerator.pedal.position","diagnostic_messages.hybrid.battery-pack.remaining.life","diagnostic_messages.engine.oil.temperature","diagnostic_messages.engine.fuel.rate","diagnostic_messages.engine.torque"],"jtype":"afb-reply","request":{"status":"success","uuid":"32df712a-c7fa-4d58-b70b-06a87f03566b"}} +``` + +## Write on CAN buses + +A new capability as been introcuded to be able to write on handled CAN buses. Two modes could be used for that which is either specifying the CAN bus and a *RAW* CAN message either by specifying a defined signal and its value. + +Examples: + +```json +# Write a raw can frame to the CAN id 0x620 +low-can write { "bus_name": "hs", "frame": { "can_id": 1568, "can_dlc": +8, "can_data": [ 255,255,255,255,255,255,255,255]} } +# Write a signal's value. +low-can write { "signal_name": "engine.speed", "value": 1256} +``` + ## Using CAN utils to monitor CAN activity You can watch CAN traffic and send custom CAN messages using can-utils preinstalled on AGL target. |