Fix write timeout for COM ports #326

Job	Run time
cargo-deny (advisories)	18s
lint	32s
cargo-deny (bans licenses sources)	16s
aarch64-apple-ios / build	1m 27s
aarch64-apple-darwin / build	1m 26s
aarch64-unknown-linux-gnu / build	38s
aarch64-unknown-linux-musl / build	1m 6s
arm-linux-androideabi / build	26s
armv7-linux-androideabi / build	24s
i686-pc-windows-gnu / build	2m 30s
i686-pc-windows-msvc / build	3m 26s
i686-unknown-linux-gnu / build	37s
i686-unknown-linux-musl / build	53s
msrv-arm-linux-androideabi / build	3m 33s
msrv-aarch64-apple-darwin / build	3m 36s
msrv-x86_64-pc-windows-msvc / build	6m 10s
msrv-x86_64-unknown-freebsd / build	3m 39s
msrv-x86_64-unknown-linux-gnu / build	3m 51s
msrv-x86_64-unknown-linux-musl / build	3m 37s
msrv-x86_64-unknown-netbsd / build	3m 44s
x86_64-pc-windows-gnu / build	3m 59s
x86_64-apple-darwin / build	1m 52s
x86_64-pc-windows-msvc / build	2m 14s
x86_64-unknown-freebsd / build	32s
x86_64-unknown-linux-gnu / build	53s
x86_64-unknown-linux-musl / build	43s
x86_64-unknown-netbsd / build	23s
	52m 45s

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