<p>I also tried with <code>sudo ./start_network.sh /dev/ttyACM0 tap0 fd00:1:2:3::/64</code> to see if the other BR takes over if they are in the same prefix.</p>
<pre><code>Iface  6  HWaddr: 06:5A  Channel: 26  Page: 0  NID: 0x23
          Long HWaddr: 79:7D:36:2C:C9:59:06:5A 
           TX-Power: 0dBm  State: IDLE  max. Retrans.: 3  CSMA Retries: 4 
          AUTOACK  ACK_REQ  CSMA  L2-PDU:102 MTU:1280  HL:64  RTR  
          RTR_ADV  6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::7b7d:362c:c959:65a  scope: local  VAL
          inet6 addr: fd00:1:2:3:7b7d:362c:c959:65a  scope: global  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff59:65a
</code></pre>
<p>But no:</p>
<pre><code>> 2019-09-13 19:37:16,791 - INFO #  nib abr
2019-09-13 19:37:16,794 - INFO # fd00:1:2:3:a:b:c:d v0 expires 10000min
</code></pre>

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