I am not sure , what is the exact question, but if i understand correctly , you are asking why i require a lambda with timer to post. if that is the case , then answer is no, we do not require a lambda with timer to post any data to sqs. it just an example. We can use other approaches as well . for example using api gateway, we call lambda which might post to SQS queue. or we can right any code which can connect to our queue and post the data. lambda with timer is one simple example of showing how to post and receive.