Problem
There may be many client application and the applications will probably lack a UI. It improves usability of an applications logs, or other text sources, and be viewed in HASS.
Potential solution
Options:
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Use MQTT events to stream logs and/or messages to HASS. This may incur network overhead so a subscription and/or enabling mechanism would be required to only stream when required.
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Command to device to poll for text.
Additional context
Investigate how others have done this.