treat all signal messages as ping response #840

Job	Run time
Build (x86_64-pc-windows-msvc)	14m 39s
Build (aarch64-pc-windows-msvc)	7m 28s
Build (x86_64-apple-darwin)	10m 46s
Build (aarch64-apple-darwin)	8m 15s
Build (aarch64-apple-ios)	9m 34s
Build (aarch64-apple-ios-sim)	8m 12s
Build (x86_64-unknown-linux-gnu)	3m 41s
Build (aarch64-unknown-linux-gnu)	6m 44s
Build (aarch64-linux-android)	4m 2s
Build (armv7-linux-androideabi)	4m 12s
Build (x86_64-linux-android)	8m 49s
	1h 26m 22s

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