@florent I also ran into this. It seems to be working on Dell hosts, but on my supermicro hosts I get nothing even though I do get data back from the cli plugin
[09:15 host01 ~]# xe host-call-plugin host-uuid=aa8e6bf4-6710-4320-98f9-d8e581cf8ef7 plugin=ipmitool.py fn=is_ipmi_device_available
true
[09:16 host01 ~]# xe host-call-plugin host-uuid=aa8e6bf4-6710-4320-98f9-d8e581cf8ef7 plugin=ipmitool.py fn=get_all_sensors
[{"name": "CPU Temp", "value": "59 degrees C", "event": "ok"}, {"name": "Inlet Temp", "value": "no reading", "event": "ns"}, {"name": "PCH Temp", "value": "43 degrees C", "event": "ok"}, {"name": "System Temp", "value": "23 degrees C", "event": "ok"}, {"name": "Peripheral Temp", "value": "30 degrees C", "event": "ok"}, {"name": "CPU_VRMON Temp", "value": "39 degrees C", "event": "ok"}, {"name": "M2_SSD1 Temp", "value": "38 degrees C", "event": "ok"}, {"name": "M2_SSD2 Temp", "value": "40 degrees C", "event": "ok"}, {"name": "DIMMAB Temp", "value": "30 degrees C", "event": "ok"}, {"name": "FAN1", "value": "16240 RPM", "event": "ok"}, {"name": "FAN2", "value": "16800 RPM", "event": "ok"}, {"name": "FAN3", "value": "16380 RPM", "event": "ok"}, {"name": "FAN4", "value": "no reading", "event": "ns"}, {"name": "FAN5", "value": "no reading", "event": "ns"}, {"name": "FANA", "value": "10080 RPM", "event": "ok"}, {"name": "FANB", "value": "no reading", "event": "ns"}, {"name": "MB 12V", "value": "11.92 Volts", "event": "ok"}, {"name": "MB 5VCC", "value": "5.10 Volts", "event": "ok"}, {"name": "MB 3.3VCC", "value": "3.34 Volts", "event": "ok"}, {"name": "VBAT", "value": "0x04", "event": "ok"}, {"name": "MB 5VSB", "value": "5.06 Volts", "event": "ok"}, {"name": "MB 3.3VSB", "value": "3.34 Volts", "event": "ok"}, {"name": "PCH 1.8V", "value": "1.82 Volts", "event": "ok"}, {"name": "CPU 1.8V_AUX", "value": "1.79 Volts", "event": "ok"}, {"name": "PCH 1.05V", "value": "1.05 Volts", "event": "ok"}, {"name": "BMC 2.5V", "value": "2.50 Volts", "event": "ok"}, {"name": "BMC 1.8V", "value": "1.81 Volts", "event": "ok"}, {"name": "CPU 1.1V_DDR", "value": "1.11 Volts", "event": "ok"}, {"name": "CPU Core", "value": "1.34 Volts", "event": "ok"}, {"name": "BMC 3.3VSB", "value": "3.34 Volts", "event": "ok"}, {"name": "CPU 1.05V", "value": "1.05 Volts", "event": "ok"}, {"name": "CPU 1.8V", "value": "1.82 Volts", "event": "ok"}, {"name": "Chassis Intru", "value": "0x00", "event": "ok"}, {"name": "PS1 Status", "value": "0x01", "event": "ok"}, {"name": "AOC_NIC1 Temp", "value": "63 degrees C", "event": "ok"}, {"name": "PS2 Status", "value": "0x01", "event": "ok"}]