docs: retained message config example #967
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Initially, ran into a TypeScript compilation problem where
{retain: true}
would not compile (and provided an unhelpful "does not match the callback type" message) because it was missing theqos
property and therefore not recognized as theIClientPublishOptions
type. Wanted to add documentation for this niche, then found that the basic examples did not say much about defining remote broker paths via URL string. Add the responsibility of clearing the retained message on the test broker, and this is is the result.Happy to adjust for clarity, or write about the TypeScript pitfall elsewhere if there is a better spot. Thanks!