Phase 1 is ready to move from paper to lab. Following Technical_Proposal_V3.0.0, I need a Raspberry Pi edge adapter that can • Photometer serial integration • HTTP API for the Android HMI • AP/offline mode for field use • Compatibility verification against the reference photometer firmware Your code must be delivered as a repeatable Pi image and a field-trial package I can flash and ship. While the adapter is taking shape, I also need the Phase 2 blueprint. The document should spell out the overall system architecture, detail every interface with its security model, and define an OTA/update and recovery strategy that keeps units serviceable in remote locations. I will break the work into fixed-price milestones and release payment once each milestone is accepted. Any hardware you need (specific Pi model, serial adaptors, photometer stubs, etc.) will be reimbursed at cost with receipts. I can get you hardware immediately so we can begin integration and architecture in parallel.