Writes appliance's flexibility.

The flexibility reflect the state of an appliance.

If updatedAt is not set, the request's timestamp is taken.

The concept of flexibility is general to all appliances. For example:

• in the case of an EVCS, the minActivePower and maxActivePower values reflect the min and max total operating power range of the EVCS; the power is the latest power value
• in the case of a meter at the coupling point (e.g. grid connection point), the minPower (negative value) is the total feedin power limit, and the max power (positive value) is the total import limit. The power, if negative, reflects power being exported to the grid, whereas if positive, reflects the power being imported from the coupling point
• in the case of a battery, the min power (negative value) represents the max discharging power, whereas the max power (positive value) represents the max charging power. The power, when negative, reflects the fact that the battery is discharging, whereas when positive, reflects the power being charged by the battery.
• in the case of a PV inverter, the min power (negative value) represents the max power output of the inverter.