this end point is used for turning on/off light
If I understand correctly, you're looking for a way to send an arbitrary message to your Alexa skill's Lambda function, without verbally interacting with the skill itself.
You can do this using the "Skill Messaging API." For more information on how to enable this, please see our documentation here:
Endpoint SkillManifestError 21 Answers
Invoke Intent from Lambda function 1 Answer