US Patent 11233860 Microcontroller device for secure communication

A microcontroller attachment for use with a microcontroller. The microcontroller attachment includes a first network interface controller (NIC) configured to communicate with a first dynamic host configuration protocol (DHCP) server to receive a first DHCP address and configured to establish a virtual private network (VPN) connection for a computing device to communicate with a remote server, the first NIC configured to be communicatively coupled to the computing device. The microcontroller attachment further includes a second NIC configured to receive a second DHCP address from a second DHCP server running on the microcontroller and send the second DHCP address to the computing device.