How about capobility of 52832 in rate,delay,distance,amount of slave in piconet ?

[Taoo]

In my situation, I want to use bluetooth to designed a piconet which has 1 master and up to 4 slave.

Each slave upload data 2KB/S,and the max distance support is 10 m,the delay holp for less than 200ms.Also,master will send some data to slave at irregular intervals.some time slave also could pick out,and used to connected with phone(both IOS and android).

Can i make it work in Ble5.0?If not, is it there any suggest solution?BR/EDR?

Early,I am trying 52832 with SDK 15.0.0  as master.Slave is a module designed by another company which used 52810.Both of them,run in BLE5.0.

In my test, it works well in 1 master - 3 slave in distance low than 2m.A)when up to 1-4(mean 1 master - 4 slave) it occur lost packege.B)when distance increase to 10m,1-3,also occur lost packege.Through analysis, I found when distance increase,jitter of packege aslo increase,buffer is not large enough for cache.but increase buffer mean greater time delay.

the main config in my test:

MTU:247 (consider decrease length of packege for resend, I had try MTU set 80,but problem still.)

TX_POWER:4dbm

MIN_CONN_INTERVAL:7.5ms  MAX_CONN_INTERVAL:12ms

SLAVE_LATENCY:0 

CONN_SUP_TIMEOUT:4000ms

Both of master and slave used PCB antenna.Whether i could enhance antenna energy efficiency to solve it?

I also trying SDK 16.0.0 using uarte in dma and baud up to 1Mbps to make master send data to mcu more quickly,is it help?

Is there any param of ble I counld adjust to improve it?

Please help!Thank you so much!!!

[Taoo]

Is there any help?

I already made it (1 mater - 4 slave,distance less than 2m) work in SDK16.0.0 using uarte 1Mbps .Sometime it work well,but sometime  appear packet lost unexplainably.it still can not work well in distance 10m.

I really hope for help, please give me some guide to try.

Thank you so much!!!

[Susheel Nuguru]

Each slave upload data 2KB/S,and the max distance support is 10 m

 This seems doable but could be challenging in a BLE noisy environment (many other 2.4GHz devices around)

Can i make it work in Ble5.0?

We have made some throughput test available in SDK16 examples that achieved around 1Mbps max though put for one connection. We used there BLE5.0 feature of 2Mbps PHY which transmits data faster from the radio. So yes, this is definitely doable but 4 connections at a max distance of 10 meters are something I have not tested. 

I found when distance increase,jitter of packege aslo increase,buffer is not large enough for cache.but increase buffer mean greater time delay.

The time delay is not because of the increased buffer, but most likely due to the retransmission of the lost packets. 

SLAVE_LATENCY:0 

Probably a good idea to increase this 1 or 2.

I also trying SDK 16.0.0 using uarte in dma and baud up to 1Mbps to make master send data to mcu more quickly,is it help?

The main challenge here is to have very less software overhead per transaction data received from UART to data sent over BLE. If the software overhead increases then the latencies of transmission of data from UART to BLE increases causing clogging. So this totally depends on how you are designing the application and also could have data transmission limitation if you want to receive data from uart to be transmitted over BLE due to uart driver software overhead. You need to do some benchmarks on this, since we have not done those benchmarks with uart data being transmitted over BLE with least software overhead.

[Susheel Nuguru]

Like I said on my previous comment, If I were you, I will put some efforts to reduce the post processing software overhead for the data received from UART. I guess that is where we can do any optimizations if any. I am assuming that the BLE data is being transmitted using 2Mbps PHY and not a 1Mbps default PHY.