How to activate Long Range

[djdehaan]

I would really like to use Bluefruit and make a Long Range connection between Servers and my Central. I know that it is not build in Bluefruit by default, but there must be a way to get that done. Who can help me what to change to get Long Range to work?

I first try to update the coding to BLE_GAP_PHY_CODED right after a connect. I do that by calling set_coded_phy from the connect_event routine. The conn_handle is available there. I use the routine below, bu I keep getting error 19. I cannot change sdk_config.h because it is not the SDK but Adafruit lib in Android. I burned the bootloader: feather_nrf52840_sense_bootloader-0.9.2_s140_6.1.1.hex

void set_coded_phy(uint16_t conn_handle)
{
ble_gap_phys_t phys;
phys.tx_phys = BLE_GAP_PHY_CODED; // Gebruik Coded PHY voor transmissie
phys.rx_phys = BLE_GAP_PHY_CODED; // Gebruik Coded PHY voor ontvangst

// Stuur een PHY update request
uint32_t err_code = sd_ble_gap_phy_update(conn_handle, &phys);
if (err_code == NRF_SUCCESS) {
log_p("Request PHY-update send.");
} else if (err_code == NRF_ERROR_RESOURCES) {
log_p("Too few resources (Error 19). try again later.");
} else {
log_p("Error LongRange PHY: %d", err_code);
}
}

Does anyone have a tip for me how to make this work?
Many thanks in advance.