Merge pull request #296 from tmpfs/disc-chars-max

Support larger discovery characterisrics maximum buffer size

Author: alexmoon

nrf-softdevice/Cargo.toml

@@ -50,6 +50,11 @@ ble-l2cap-credit-workaround = []
 evt-max-size-256 = []
 evt-max-size-512 = []
 
+# Support more discovery characteristics in GATT clients,
+# may be needed with higher ATT_MTU and peripherals with 
+# many service characteristics
+discovery-chars-12 = []
+
 [dependencies]
 defmt = { version = "0.3", optional = true }
 log = { version = "0.4.11", optional = true }

nrf-softdevice/src/ble/gatt_client.rs

@@ -106,7 +106,11 @@ impl From<RawError> for DiscoverError {
     }
 }
 
+#[cfg(not(feature = "discovery-chars-12"))]
 const DISC_CHARS_MAX: usize = 6;
+#[cfg(feature = "discovery-chars-12")]
+const DISC_CHARS_MAX: usize = 12;
+
 const DISC_DESCS_MAX: usize = 6;
 
 pub(crate) async fn discover_service(conn: &Connection, uuid: Uuid) -> Result<raw::ble_gattc_service_t, DiscoverError> {