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MultiNav Pro+ BLE - does output power scale down automatically at short range?

Jessica WilsonJune 23, 2026
Hey all, been working on a wildlife tracking project where I've got a mix of short-range and long-range nodes - some units are basically line-of-sight within 100 meters of each other, others are out at several km. The BLE module's 50km range spec is obviously great for the far nodes, but I'm wondering what happens on the close ones. Does the module do any kind of adaptive TX power, or is it just running at full blast regardless of how close the peer device is? Asking mostly from a battery/power budget angle since some of my field nodes are solar + super-cap and I really don't want to burn unnecessary power transmitting at max output when the receiver is basically right next to it.
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AdamJune 23, 2026
@Jessica Wilson great use case — wildlife tracking with a mixed-range topology is exactly the kind of deployment where this matters.
 
The MultiNav Pro+ doesn't do automatic adaptive TX power out of the box — it's not running some background RSSI loop that throttles output based on how close the peer is. That said, the STM32WB07 at the core of the module does expose TX power control through the BLE stack, so you can absolutely implement this yourself in firmware. The general approach is to read the RSSI of the connected peer periodically and step the TX power down when signal strength is strong — the HCI command for that on the WB07 is `hci_le_set_transmit_power_level` (or the equivalent vendor extension depending on which BLE stack version you're on). For nodes sitting within 100m line-of-sight you could probably drop TX power significantly and still have plenty of link margin, which would meaningfully help your solar/supercap budget.
 
If you want a starting point, the AI Firmware Builder in the Dev Hub is actually pretty good at generating the RSSI-polling + adaptive TX power scaffolding — describe your node topology and it'll give you something workable to iterate from rather than starting from scratch. Worth trying before you go digging through the STM32WB reference manual.

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