Pablo - I do not believe for P9 and P10 that it is possible to get this using the HMC Rest API, there are some HMC commands if you are on a BMC type system, but on a FSP system ... read on
It is possible to get this using redfish API Managing the system by using DMTF Redfish APIs - IBM Documentation , using a python prog that tunnels through HMC to the FSP
Trying to start ssh tunnel
Tun Status:{('0.0.0.0', 39846): True}
using ->https://1.2.3.4:39846
This system:Name:My2CEC1080 Model:9080-HEX SerialNumber:Blah UUID:0004BLAH
Chassis 'YA11ZP2CBLAH' Status
Sensor | Reading | Health | Location
Power Supply 1000 State | Enabled | OK | U78D8.ND0.FGDBLAH-E1
Power Supply 1000 LineInp | 492V | N/A | U78D8.ND0.FGDBLAH-E1
Power Supply 1000 LastPow | 1950W | N/A | U78D8.ND0.FGDBLAH-E1
Power Supply 1001 State | Enabled | OK | U78D8.ND0.FGDBLAH-E2
Power Supply 1001 LineInp | 489V | N/A | U78D8.ND0.FGDBLAH-E2
Power Supply 1001 LastPow | 1950W | N/A | U78D8.ND0.FGDBLAH-E2
Power Supply 1002 State | Enabled | OK | U78D8.ND0.FGDBLAH-E3
Power Supply 1002 LineInp | 493V | N/A | U78D8.ND0.FGDBLAH-E3
Power Supply 1002 LastPow | 1950W | N/A | U78D8.ND0.FGDBLAH-E3
Power Supply 1003 State | Enabled | OK | U78D8.ND0.FGDBLAH-E4
Power Supply 1003 LineInp | 495V | N/A | U78D8.ND0.FGDBLAH-E4
Power Supply 1003 LastPow | 1950W | N/A | U78D8.ND0.FGDBLAH-E4
Fan 2103 | 6569RPM | OK | U78D8.ND0.FGDBLAH-A1
Fan 2104 | 5973RPM | OK | U78D8.ND0.FGDBLAH-A1
Fan 2105 | 6459RPM | OK | U78D8.ND0.FGDBLAH-A2
Fan 2106 | 6040RPM | OK | U78D8.ND0.FGDBLAH-A2
Fan 2107 | 6428RPM | OK | U78D8.ND0.FGDBLAH-A3
Fan 2108 | 6108RPM | OK | U78D8.ND0.FGDBLAH-A3
Fan 2109 | 6537RPM | OK | U78D8.ND0.FGDBLAH-A4
Fan 210a | 6081RPM | OK | U78D8.ND0.FGDBLAH-A4
Fan 210b | 6250RPM | OK | U78D8.ND0.FGDBLAH-A5
Fan 210c | 6013RPM | OK | U78D8.ND0.FGDBLAH-A5
Chassis 'YA11ZP31BLAH' Status
Sensor | Reading | Health | Location
Power Supply 1004 State | Enabled | OK | U78D8.ND1.FGDBLAH-E1
Power Supply 1004 LineInp | 634V | N/A | U78D8.ND1.FGDBLAH-E1
Power Supply 1004 LastPow | 1950W | N/A | U78D8.ND1.FGDBLAH-E1
Power Supply 1005 State | Enabled | OK | U78D8.ND1.FGDBLAH-E2
Power Supply 1005 LineInp | 654V | N/A | U78D8.ND1.FGDBLAH-E2
Power Supply 1005 LastPow | 1950W | N/A | U78D8.ND1.FGDBLAH-E2
Power Supply 1006 State | Enabled | OK | U78D8.ND1.FGDBLAH-E3
Power Supply 1006 LineInp | 37V | N/A | U78D8.ND1.FGDBLAH-E3
Power Supply 1006 LastPow | 1950W | N/A | U78D8.ND1.FGDBLAH-E3
Power Supply 1007 State | Enabled | OK | U78D8.ND1.FGDBLAH-E4
Power Supply 1007 LineInp | 627V | N/A | U78D8.ND1.FGDBLAH-E4
Power Supply 1007 LastPow | 1950W | N/A | U78D8.ND1.FGDBLAH-E4
Fan 2115 | 6459RPM | OK | U78D8.ND1.FGDBLAH-A1
Fan 2116 | 6067RPM | OK | U78D8.ND1.FGDBLAH-A1
Fan 2117 | 6443RPM | OK | U78D8.ND1.FGDBLAH-A2
Fan 2118 | 6040RPM | OK | U78D8.ND1.FGDBLAH-A2
Fan 2119 | 6413RPM | OK | U78D8.ND1.FGDBLAH-A3
Fan 211a | 5986RPM | OK | U78D8.ND1.FGDBLAH-A3
Fan 211b | 6459RPM | OK | U78D8.ND1.FGDBLAH-A4
Fan 211c | 6053RPM | OK | U78D8.ND1.FGDBLAH-A4
Fan 211d | 6537RPM | OK | U78D8.ND1.FGDBLAH-A5
Fan 211e | 6122RPM | OK | U78D8.ND1.FGDBLAH-A5
What model of Power systems do you have (and firmware versions) ? I can give you a cut down version of my python program with some notes on what to change - the usernames/passwords are pretty easy to figure out
Looking at your original question about getting the status from EMX0 IO Draws - I have not found a way to do that without opening a support call - but it is something I have been looking at - I'll take that up as 'for investigation'
Let me also check on P9 and P10 and what levels of firmware I can see that gives a result (or not) and I'll see if it SHOULD work vs defect