IoT SDK - When to restart radvd when using multiple nRF52?

Question

Hi, I use the following. 
 
 Raspberry Pi 3 (RPi3 with Raspbian Jessie 4.4) as a router, 
 
 RPi3 is connected to a Wi-Fi router to access the Internet by using the built-in Wi-Fi BLE BCM43438 chip. 
 
 
 IoT SDK 0.9 
 
 
 MQTT Publisher Example 
 
 
 PCA10040 v1.1 
 
 
 Keil MDK 5 
 
 
 I'm planning a project which uses multiple PCA10040 boards. 
 For instance, I'm about to use 4 PCA10040 and these will be connected to RPi3 which acts as a BLE enabled router. 
 Thanks to Stian's answer, I have connected one PCA10040 that uses MQTT publisher example. 
 After connecting to the PCA10040 kit, I typed 
 pi# service radvd restart
 
 as informed. 
 /+++++++++++++++++++++++++++++++++++/ 
 So my questions are 
 
 Do I have to restart radvd after every new connection? 
 
 For instance, I connected PCA10040 (A) and restarted radvd. 
 When I connect another PCA10040 (B), do I have to restarted radvd again? 
 
 This question is also related to how many PCA10040 can be connected with the RPi3. 
 
 How many connections can the RPi3 can have with PCA10040s? 
 -Best Regards, Mnago

Stian Røed Hafskjold · Accepted Answer

You don't need to restart radvd after every new connection. You can just start radvd before you connect any kits, and then whenever you connect a new kit it will do the router advertisement. 
 
 Remember to add the global prefix to the bt0 interface after connecting the first kit. 
 ifconfig bt0 add 2001:db8::1/64
 
 You should download and install wireshark! (sudo apt-get install wireshark). Then you can monitor the bt0 interface and see the router advertisement packets and ping packets and everything. Great for debugging. (you have to start it with sudo) 
 
 This is dependent on the Bluetooth hardware on the RPi3.