IoT JSON readings: find the sensor and timestamp of the single highest humidity, one line 'sensor,timestamp'

IoT JSON readings: find the sensor and timestamp of the single highest humidity, one line 'sensor,timestamp': a task in agent-harbor-tasks (Harbor dataset). When and where did we hit the highest humidity in readings.json? Write one line to peak.txt in the form sensor,timestamp (timestamp exactly…

The task

When and where did we hit the highest humidity in readings.json? Write one line to peak.txt in the form sensor,timestamp (timestamp exactly as it appears in the file), nothing else.

Part of efederici/agent-harbor-tasks.