Self-Powered E-Ink Display Driver

I want an ultra-low-power driver board that can run a small E-Ink panel completely untethered. The module must expose both WiFi and Bluetooth so it can receive data from a web API or a local mobile app and refresh the screen on demand. Power autonomy is critical: in addition to a rechargeable battery the board should accept a compact solar cell and scavenge ambient 2.4 GHz energy (WiFi harvesting) to keep the system alive for months without manual charging.

Core expectations
• Electronics: schematic, component selection and PCB layout optimized for sub-100 µA standby, including the WiFi/BLE SoC, power-path management, solar MPPT, RF-to-DC harvester and battery protection.
• Firmware: ESP-IDF/Arduino or similar code that boots, joins WiFi or BLE, pulls a JSON payload, drives the E-Ink controller, then returns to deep sleep. OTA update support is desirable.
• Prototype: one fully assembled board plus BOM and gerbers so I can order more units.

Acceptance criteria
1. Board refreshes a 2.9-inch E-Ink display from a cloud endpoint.
2. Average current in sleep ≤ 15 µA with WiFi/BLE off.
3. Solar charger operates from 100 mW indoor light; RF harvester yields measurable trickle at typical office router distance.
4. Battery remains above 3.6 V after a seven-day indoor test cycle with four screen updates per day.

If you have prior work combining E-Ink, low-power wireless and energy harvesting, your insight will be invaluable.