Advertesiment

[Andhika]

Hi,

I'm currently wprking on my project, my project it's about swarm, before the master swarm can advertise the message to the slave swarm through blehandler function now we want to develop so we can send order from smartphone to the master, I'm facing the problem that the smartphone can't detect the connection because of blehandler function, can ble advertise to slave device while it established a connection with smartphone? should i build a Thread or a mesh?

[Andhika]

-i already tried it once but i can't connect to the putty eventhough i followed the instruction and then i tried using the simulator in ses it can't read what i send, honestly i'm using laird dvk-bl654 based on nRF52680 chips.

-and it's possible sending the order to drone without uart? i've once discussed it with my supervisor, that we using directly ble as our uart so we installing the order directly on chips. that's what we want honetsly.

-i'm wondering instead building a mesh should i make it as central & peripheral? because the role of the 1st drone act as peripheral from smartphone and also as central (master) to another 2 drones, but as soon as the 1st drone flies it becomes slave.

thank you for your support i'm really a beginner on these but it's my chance to learn.

[haakonsh]

Andhika said:

-and it's possible sending the order to drone without uart? i've once discussed it with my supervisor, that we using directly ble as our uart so we installing the order directly on chips. that's what we want honetsly.

 You can use regular GATT services and characteristics to transfer whatever data you want, it does not have to be a UART bridge.

 

Andhika said:

-i'm wondering instead building a mesh should i make it as central & peripheral? because the role of the 1st drone act as peripheral from smartphone and also as central (master) to another 2 drones, but as soon as the 1st drone flies it becomes slave.

 There's no point in creating a meshed network with just three nodes, what you want is probably a pico-net. 

Andhika said:

because the role of the 1st drone act as peripheral from smartphone and also as central (master) to another 2 drones, but as soon as the 1st drone flies it becomes slave.

 Why don't you draw a graph of this network and the two states that you described, I did not understand to whom the 1st drone will become a slave to after it flies. 

[Andhika]

Sorry my bad, i was wrong, the first drone remain as a master even after it flies

it should look like this.

[haakonsh]

In our examples you can set the number of peripheral and central links the SoftDevice will support at compile time with the NRF_SDH_BLE_PERIPHERAL_LINK_COUNT, RF_SDH_BLE_CENTRAL_LINK_COUNT, and NRF_SDH_BLE_TOTAL_LINK_COUNT, found in sdk_config.h.

I suggest you look at the ble_app_uart example for how to create a custom service. If you do not know what a service and a characteristic is I suggest you google it, as there is plenty of resources that have described that already. 

I propose a service with one characteristic for battery status and another one for commands. If you have other needs such as Location, Intent, etc. you can add characteristics for that as well.

[Andhika]

thank for your help

so to be sure i sum up what we discuss,

for my connection problem caused by previous project function called BLEhandler (which i believe in advertising mode) i should either build a piconet or make my 1st drone act central and peripheral, is it sound right to you?