Optimal client implementation for time series collecting?

[amq]

An InfluxData Telegraf contributor expressed an interest in adding a CoAP observer plugin: influxdata/telegraf#2994

Could you point out some important points which need to be considered to make sure that the plugin is suitable for thousands of devices, also from the configuration perspective?

Here is an MQTT consumer plugin as a reference: https://github.com/influxdata/telegraf/tree/master/plugins/inputs/mqtt_consumer