Re: pi to bpm - Failed to call the endpoint: Error in call over HTTP: HTTP 0 null

where is http timeout setting done in PI single stack

Try increasing max number of threads (icm/max_threads) and timeout for http service (icm/server_port_0 = PROT=HTTP,PORT=5$(SAPSYSTEM)00,TIMEOUT=1800,PROCTIMEOUT=16000) in ICM.