20260929-0235-air-hub-entry-adds-efr32mg21 Add EFR32MG21 to the entry Air Hub and keep its ESP32-C6 and 433 MHz link
- status: completed
- createdAt: 2026-09-29 02:35
- approvedAt: 2026-09-29 02:45 (owner: "是")
- relatedTask: 20260929-0235-air-hub-entry-adds-efr32mg21
Context
章节标题：“Context”Air Hub spec R0.9 (commit 8b76a2a) selects two products:
- Air Hub (AH-19, 59 USD): RV1106G3 chip-down (alternate SSD202D) + ESP32-C6 (Wi-Fi uplink, BLE for Air, configuration, CAN via TWAI) + CMT2300A (433 MHz). BOM 25.8–40.6 USD against a landed-cost cap of 19.18–22.13 USD.
- Air Hub Pro (AH-20, 119 USD): RK3506J stamp-hole core board (native CAN) + EFR32MG21 + ESP32-C6 (Wi-Fi, configuration) + CMT2300A. BOM 34.6–46.7 USD against 38.68–44.63 USD.
The owner compared three entry variants in this session:
| Entry variant | BOM (USD) | Change vs R0.9 |
|---|---|---|
| + EFR32MG21, − 433 MHz | 27.8–43.2 | +1.7–2.9 |
| + EFR32MG21, − 433 MHz, − ESP32-C6 (+ MCP2518FD, Ethernet only) | 25.9–41.4 | ≈0 |
| + EFR32MG21, keep ESP32-C6 and 433 MHz (chosen) | 29.7–45.4 | +3.9–4.8 |
EFR32MG21 link cost 3.9–4.8 (A020F1024 LCSC 3.41 @1k). Chosen build against the 59 USD cap: gap 7.6–26.2; with the connector plus enclosure at 3–4 USD the BOM is 27.7–38.9 and the gap 5.6–19.7. At 50 % margin after a 25–35 % channel discount the chosen BOM implies a retail price of about 79–140 USD. The BOM difference to Air Hub Pro shrinks to 1.3–4.9 USD.
Interfaces: RV1106G3 has 6 UART (EFR32MG21), 2 SPI (CMT2300A), SDIO 3.0 (C6); SSD202D has one general SPI (CMT2300A), SDIO (C6) and UART (EFR32MG21), so the alternate still fits.
Proposal
章节标题：“Proposal”Revised 2026-09-29 after the owner removed the 433 MHz link from the entry product (see Annotations). Entry build: RV1106G3 (alternate SSD202D) + ESP32-C6 (Wi-Fi uplink, configuration, CAN) + EFR32MG21 (BLE for Air, Zigbee / Thread by image); no CMT2300A. BOM 27.8–43.2 (+1.7–2.9 vs R0.9). Against the 59 USD cap: gap 5.7–24.0; with the connector plus enclosure at 3–4 USD the BOM is 25.8–36.7 and the gap 3.7–17.5. Air Hub Pro keeps the 433 MHz link; the BOM difference to Pro is 3.5–6.8. SSD202D's only general SPI is free again (CMT2300A removed).
Spec P05-air-hub.md R1.0:
- §1 / §2.1 / §2.3: AH-19 becomes H4 RV1106G3 (alternate H1 SSD202D) + ESP32-C6 CAN + R1,
no O1; both products carry EFR32MG21 with Zigbee / Thread by image; the C6 is Wi-Fi uplink,
configuration channel and (entry only) CAN, never Air's radio. The 433 MHz link (
GW-09) is Air Hub Pro only. BOM and gap numbers above in §2.1. - §2.4: radio, wireless, capacity and structure rows (C6 shared-radio note removed; 433 antenna Pro only).
- §3: Air-clause scope line,
GW-04,GW-07(both products),GW-09(Pro only),GW-13(drop "C6 BLE also serves Air"). - §4 system map, §5 antennas and interface list, §6 433 paragraph (Pro), §7 compliance (entry:
two 2.4 GHz radios; Pro: two 2.4 GHz radios plus 433 MHz), §8
AIR-O-03gap numbers,AIR-O-11(R1 for both),AIR-O-13(Pro), §9 change-log row.
Design appendix R0.8, guide R0.6 (V-11 both, V-12 Pro only, EOL), brief, index, evaluation §8.4 and §10, switch line spec and index, product plan platform / radio / price rows, compliance matrix Switch row, wireless SoC catalogue in-use rows. Changelog, task and plan status.
Defaults unless the owner says otherwise: entry price stays 59 USD with the gap recorded (R0.9 rule); Pro stays 119 USD with the narrower difference noted.
Risks
章节标题：“Risks”- Entry gap to its cost cap grows by 1.7–2.9 USD.
- Two 2.4 GHz radios in the entry enclosure (co-existence and compliance scope grow).
- Entry loses the 433 MHz link; third-party 433 devices and YBO 433 devices need Air Hub Pro.
Scope
章节标题：“Scope”About 16 documentation files; no code.
Alternatives
章节标题：“Alternatives”- Entry keeping 433 MHz (29.7–45.4).
- Entry without 433 MHz and without ESP32-C6, Ethernet only (25.9–41.4).
- Keep R0.9 (C6 carries Air's BLE; no Zigbee on entry).
Annotations
章节标题：“Annotations”- 2026-09-29: owner chose to keep the original entry build and add EFR32MG21 ("保留原始的增加EFR32MG21吧").
- 2026-09-29: owner removed the 433 MHz link from the entry product ("去掉433"); Pro keeps it (assumed).
- 2026-09-29: approved with the defaults (Pro keeps 433 MHz; entry 59 USD with the gap recorded; Pro 119 USD) ("是").