let rxAge() return negative if invalid
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@ -85,7 +85,7 @@ double Universe::rxRate()
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* @brief milliseconds since the last update
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* @return
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*/
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unsigned int Universe::rxAge()
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int Universe::rxAge()
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{
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if (!last_seen_.time_since_epoch().count())
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return -1; // universe has never been seen
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@ -53,7 +53,7 @@ class Universe {
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virtual uint8_t slot (const uint16_t);
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virtual double rxRate();
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virtual unsigned int rxAge();
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virtual int rxAge();
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virtual void setValue (const uint16_t address, const uint8_t value);
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virtual void setValue (const uint16_t start, const uint16_t footprint,
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