Rpc client u subscription #30

Job	Run time
Build up-cpp and dependencies	1m 34s
Run Valgrind Memcheck	3m 31s
Run up-cpp tests	19s
Run Valgrind ThreadCheck	3m 24s
Run Valgrind Helgrind	2m 53s
Lint C++ sources	3m 21s
Run Valgrind DHAT	2m 28s
CI status checks	2s
	17m 32s

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