Redundant contactless communication

1. A method comprising:

performing a loopback test on a first contactless connector and a second contactless connector of a first device, wherein performing the loopback test comprises:

configuring the first contactless connector as a transmitter and the second contactless connector as a receiver,

sending a first signal pattern from the first contactless connector to the second contactless connector,

determining whether a first received signal pattern received by the second contactless connector matches the first signal pattern,

in response to determining that the first received signal pattern matches the first signal pattern, configuring the first contactless connector as a receiver and the second contactless connector as a transmitter,

sending a second signal pattern from the second contactless connector to the first contactless connector,

determining whether a second received signal pattern received by the first contactless connector matches the second signal pattern,

in response to determining that the second received signal pattern matches the second signal pattern, configuring the first contactless connector as a primary connector and the second contactless connector as a redundant connector; and

establishing a communication link between the first device and a second device using the primary connector.

2. The method of claim 1 , wherein establishing the communication link between the first device and the second device includes configuring half-duplex communication.

3. The method of claim 2 , wherein the half duplex communication includes switching the transceiver of the primary connector between transmitter and receiver modes.

4. The method of claim 1 , wherein in response to determining that the first or second received signal pattern does not match, respectively, the first or second signal pattern, determining a loopback error response.

5. The method of claim 4 , wherein the loopback error response establishes a primary connector for communication with the second device by alternating transmission by the first contactless connector and the second contactless connector and establishing the primary connector based on confirmation messages received from the second device.

6. The method of claim 1 , further comprising:

determining an error condition in the first contactless connector; and

responsive to the error, activating the second contactless connector and using the second contactless connector to provide the communication link between the first device and the second device.

7. A system comprising:

a first device comprising:

a first contactless connector and a second contactless connector, and

a first controller configured to test the first contactless connector and the second contactless connector to determine a primary connector and a redundant connector, wherein the primary connector is configured to establish a communication link with a connector of another device;

wherein the testing comprises:

configuring the first contactless connector as a transmitter and the second contactless connector as a receiver,

sending a first signal pattern from the first contactless connector to the second contactless connector,

determining whether a first received signal pattern received by the second contactless connector matches the first signal pattern,

in response to determining that the first received signal pattern matches the first signal pattern, configuring the first contactless connector as a receiver and the second contactless connector as a transmitter,

sending a second signal pattern from the second contactless connector to the first contactless connector,

determining whether a second received signal pattern received by the first contactless connector matches the second signal pattern, and

in response to determining that the second received signal pattern matches the second signal pattern, configuring the first contactless connector as a primary connector and the second contactless connector as a redundant connector.

8. The system of claim 7 , wherein the first controller includes a state machine configured to test the operation of the first contactless connector and the second contactless connector, wherein a primary connector and a redundant connector is established based on the testing.

9. The system of claim 7 , wherein the first and second contactless connectors of the first device each include a transceiver having an antenna oriented such that the first and second contactless connector are communicatively coupled to each other.

10. The system of claim 7 , further comprising:

a second device comprising:

a third contactless connector and a fourth contactless connector, and

a second controller configured to test the third contactless connector and the fourth contactless connector to determine a primary connector and a redundant connector,

wherein each of the first contactless connector and the second contactless connector is configured to selectably establish a communication link with either the third contactless connector or the fourth contactless connector.