在Mesh Profile Specification V1.0.1有这一句话，是不是说一个设备可以同属于两个Mesh网络？
2.2.2 Devices and nodes
A device that is not a member of a mesh network is known as an unprovisioned device. A device that is a
member of a mesh network is known as a node. A Provisioner is used to manage the transitions between
an unprovisioned device and a node.
An unprovisioned device cannot send or receive mesh messages; however, it advertises its presence to
Provisioners. A Provisioner will invite an unprovisioned device into a mesh network after it has been
authenticated, converting the unprovisioned device into a node.
A node can send or receive mesh messages and is managed by a Configuration Client, that may also be
the same device as the Provisioner, over the mesh network to configure how the node communicates
with other nodes. A Configuration Client can remove a node from a mesh network, which reverts it back
to an unprovisioned device.
A device may support multiple instances of a node by offering itself to be provisioned to another mesh
network after already being provisioned to a mesh network. Each instance of a mesh network is
determined by addresses and a device key obtained by the device during provisioning.
