Issue in DA14531 MOD Bluetooth range

Question

Hi Team, 
 
 Iam using CodeLess: 6.380.14.22 
 In my code i have set power level as +2.5 dBm and working as expected range like 25 to 30 meters. 
 But the same code is flashed to other Module, which is not working beyond 5 meters. 
 How do we say it is hardware of DA14531 MOD issue or Firmware issue? 
 If it is Hardware issue how can we fix it? 
 How can we check the power level is really set to +2.5dBm?

Regards, 
 Laxmi Narayana

OV_Renesas · Answer

Hi Laxmi, Thank you for posting your question online. 
 laxmi said: But the same code is flashed to other Module, which is not working beyond 5 meters. 
 How do we say it is hardware of DA14531 MOD issue or Firmware issue? 
 It would be difficult to be hardware problem of the DA14531MOD. Only if the installation on your custom PCB has not been made as stated in the Guidelines there could be issues with the RF performance. Please refer on DA14531MOD Datasheet , section 8 Design Guidelines, page:17 
 laxmi said: How can we check the power level is really set to +2.5dBm? 
 Please refer here: 9. AT Commands &mdash; DA145XX Tutorial SDK Getting started (renesas.com) You can use the AT+PWRLVL command to get the power level. Best Regards, OV_Renesas