A commissioning tool for granting a network joining permit to network devices for joining a network includes a network install code generating unit for generating network install codes (NICs), a memory unit configured to save the NICs, a transmitter configured to transmit the NICs generated by the network install code generating unit to network devices and a network coordinating device. The commissioning tool also includes a user inter-face configured to receive user commands to transmit the NICs generated by the network install code generation unit, and a network control unit, the network control unit being in functional communication with the memory unit, the transmitter and the user interface. The network control unit is configured to instruct the transmitter to transmit the NICs upon receiving a command from the user over the user interface.