2results about How to "Reduce transmission error rate" patented technology

The application relates to a display screen control system and a display screen, the system comprising a sending card, N+1 receiving card groups and N distribution cards, wherein N is a positive integer; the sending card comprises a first data interface and a second data interface; the N distribution cards are connected in sequence in cascade, and a first-stage distribution card is connected with the first data interface of the sending card; a first receiving card group is connected with the second data interface of the sending card; and the remaining N receiving card groups are connected with the N distribution cards in one-to-one correspondence. In the system, the distribution cards are connected in cascade with the sending card in a specific mode, the number of the interfaces of the sending card is reduced, wiring is simpler, and the installation complexity and difficulty are reduced. Further, the distribution cards are connected in sequence in cascade to form an orderly link, transmission confusion and interference caused by complex wiring are avoided, signal attenuation and noise are reduced, data is stably and accurately transmitted, and the system stability is enhanced.

The invention relates to the Internet of Things technology, in particular to an Internet of Things data interaction method and system based on MQTT and a readable storage medium, and the Internet of Things data interaction method based on MQTT comprises the steps that a device end reports a file transmission request to a cloud platform end through an MQTT file uploading theme, at least assigning an initial fragment size, a total file size and a verification value in the file transmission request; when the cloud platform end monitors the file transmission request, the cloud platform end verifies the device end and then issues a fragment transmission strategy to the device end through the MQTT dynamic theme, and the fragment transmission strategy at least comprises the fragment size dynamically adjusted by the cloud platform end according to the network condition; the device end uploads file fragments to the cloud platform end according to a fragment transmission strategy issued by the cloud platform end and a fragment index sequence, and informs the cloud platform end after transmission is completed; and the cloud platform end verifies the transmission condition after receiving the transmission completion notification of the equipment end, and returns a transmission result to the equipment end through the MQTT response theme.