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Updated Carrier sense multiple access (CSMA) (markdown)

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sh123 2021-10-20 21:01:04 +03:00
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Carrier-sense-multiple-access-(CSMA).md

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- Carrier detection is used when sketch is built based on RadioLib library with `USE_RADIOLIB` flag - Carrier detection is used when sketch is built based on RadioLib library with `USE_RADIOLIB` flag
- Also, additional flag `cfg.LoraUseCad` (`CFG_LORA_USE_CAD`) must be set to true - Also, additional flag `cfg.LoraUseCad` (`CFG_LORA_USE_CAD`) must be set to `true`
- CSMAp is utilized by this project as per KISS specification. TX path is executed only when there is no incoming data returned by `LoRa::parsePacket` and TX path is executed with probability p (CSMA persistence), configured by const `Loraprs::Service::CfgCsmaPersistence` in `loraprs_service.h`. Random value is selected between 0 and 255 and TX is executed only when it is lower than `CfgCsmaProbBoundary`. - CSMAp is utilized by this project as per KISS specification. TX path is executed only when there is no incoming data returned by `LoRa::parsePacket` and TX path is executed with probability p (CSMA persistence), configured by const `Loraprs::Service::CfgCsmaPersistence` in `loraprs_service.h`. Random value is selected between 0 and 255 and TX is executed only when it is lower than `CfgCsmaProbBoundary`.
- To decrease TX probability in case of high traffic use lower value. `Loraprs::ServiceCsmaSlotTimeMs` configures the amount of time in milliseconds to wait if transmission was not performed due to persistence, select lower value for lower TOA (time on air). It is also possible to dynamically override these parameters with KISS P 0x02 and SlotTime 0x03 command codes from the client. - To decrease TX probability in case of high traffic use lower value. `Loraprs::ServiceCsmaSlotTimeMs` configures the amount of time in milliseconds to wait if transmission was not performed due to persistence, select lower value for lower TOA (time on air). It is also possible to dynamically override these parameters with KISS P 0x02 and SlotTime 0x03 command codes from the client.