BLE connectivity cheatsheet — Course 1 M07

Course 1 · Module 7

Lesson · Lab · TOC

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BLE vs MQTT (pick for Capstone)

Need	Prefer
Phone / desktop nearby, no Wi‑Fi	BLE
Cloud / LAN broker / multi-subscriber	MQTT
Both local demo + cloud	Both (M08 bonus)

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CM55 API (TESA)

API	Role
cm55_trigger_ble_periph_status_get	Request status (async)
cm55_ble_periph_status_get_sync	Request + wait → ipc_ble_periph_status_t
cm55_get_ble_periph_status	Read last cached status
cm55_trigger_ble_periph_adv_ctrl	ADV action async
cm55_ble_periph_adv_ctrl_sync	ADV action + wait result
cm55_ble_request_scan_all / _name / _addr	Start scan (observer)
cm55_ble_ipc_set_event_handler	Receive IPC_EVT_BLE_*

Headers (names only): cm55_ipc_app.h, ipc_ble_periph_types.h

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ADV actions

action	Meaning
0	Stop advertising
1	Start advertising
2	Restart advertising

uint8_t result = 0xFF;
(void)cm55_ble_periph_adv_ctrl_sync(1U, &result, 5000U);

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Status fields (quick)

Field	Watch for
profile_ble_active	BLE profile on
stack_ready	Stack up
connection_id	Non-zero ⇒ linked
tx_notify_enabled	Host enabled notify
last_error	Non-zero ⇒ inspect

ipc_ble_periph_status_t st;
(void)cm55_ble_periph_status_get_sync(&st, 5000U);

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Host checklist

1. Firmware BLE profile ON + reboot
2. One Central only (ble-flet or nRF Connect)
3. Hunt name prefix TESAIoT-
4. If invisible after ~60 s idle ADV: reboot board / check ADV policy

Pack: TESAIoT_Hackathon → ble-flet/

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Architecture reminder

CM55 app  --IPC-->  CM33 BLE stack (AIROC)  --GATT-->  Phone/PC

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Further reading

• Bluetooth LE overview
• Infineon Find Me CE
• Developer Hub

Lesson · Lab · M08 Capstone