the present invention discloses a method by which a new bluetooth piconet is established amongst participants of an old bluetooth piconet whose master has disappeared . after determining that the master has disappeared , one of the slaves is selected to take the function of the master and reestablishes communications at the baseband layer by contacting each of the other participants . further , the present invention discloses a method and an associated device for realizing point - to - multipoint communications using a bluetooth piconet by using an application adaptation layer and a local addressing list . also , the present invention discloses a method by which point - to - multipoint communications by an application using a bluetooth piconet is reestablished amongst participants of an old bluetooth piconet whose master has disappeared . after reestablishing the piconet at the baseband layer , communications at higher layers of the bluetooth protocol stack are reestablished from the bottom up , that is , reestablishing communications at the lm layer precedes reestablishing communications at the l2cap layer .