T0 hbox-watchdog-v6.{sch,pcb,pro,dru} forked from v5.5 @ e6ac8cc (new files on main,
same precedent as v4 -> v5). All internal project refs renamed, paren-balanced.
T1 Deleted the simpleRTK2B Pro socket (MOD1), both XBee sockets (J7/J8) and the modem
reset button (SW4G1) from schematic and PCB, plus the 25 on-pin labels that carried
their connectivity. The schematic has ZERO wires - connectivity is labels on pins -
so no wire/junction surgery was needed.
T2 Relay K1 pin 10 (NO contact) moves from PA9 /USART1_TX to PC6 /USART6_TX, giving the
MCU ownership of the modem RX line while K1 de-energised still feeds the receiver's
GGA straight to the modem (MCU-dead fail-safe). PA9 freed -> no_connect. USART6_RX
added on PC7. Retired /USART1_TX copper ripped (7 items).
Verified: /USART6_TX = U16.37 + K1.10 | /USART1_RX = U16.43 + Rdfu1.1 + K1.1 | PA9 free.
Nets awaiting T3/T4 silicon: /DOUT_4G, /MODEM_RST, /GNSS_TX, /GNSS_RX, /USART6_RX.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YJ4eAB6zjQT49RVwpgfKdt
