Case 1: I try to scan wifi after close hotspot because I would like to simulate lost connection. Then led on photon turns to blinking orange.And when I try scanning again.SSID is returning empty and stop working while scanning.
Case 2: Same as the case 1, but this time I’m not connect a photon with cloud. Everything can work fine and can scan SSID.
Have you tried tearing down cloud (Particle.disconnect()) and WiFi (WiFi.disconnect()) connection once you encounter the loss of connectivity?
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Thanks you so much for your support. It can work. 
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