Merge pull request #9441 from dhalbert/nordic-fix-mtu-negotiation

nordic: fix BLE MTU negotation
adafruit · Jul 20, 2024 · 98982c6 · 98982c6
2 parents 2f62612 + f2f5d9b
commit 98982c6
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Showing 3 changed files with 118 additions and 13 deletions.
diff --git a/ports/nordic/bluetooth/ble_drv.c b/ports/nordic/bluetooth/ble_drv.c
@@ -18,11 +18,112 @@
 #include "py/gc.h"
 #include "py/misc.h"
 #include "py/mpstate.h"
+#include "mpconfigport.h"
 
 #if CIRCUITPY_SERIAL_BLE && CIRCUITPY_VERBOSE_BLE
 #include "supervisor/shared/bluetooth/serial.h"
 #endif
 
+#if CIRCUITPY_VERBOSE_BLE
+const char *ble_drv_evt_name(uint32_t evt) {
+    switch (evt) {
+        case BLE_GAP_EVT_CONNECTED:
+            return "BLE_GAP_EVT_CONNECTED";
+        case BLE_GAP_EVT_DISCONNECTED:
+            return "BLE_GAP_EVT_DISCONNECTED";
+        case BLE_GAP_EVT_CONN_PARAM_UPDATE:
+            return "BLE_GAP_EVT_CONN_PARAM_UPDATE";
+        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
+            return "BLE_GAP_EVT_SEC_PARAMS_REQUEST";
+        case BLE_GAP_EVT_SEC_INFO_REQUEST:
+            return "BLE_GAP_EVT_SEC_INFO_REQUEST";
+        case BLE_GAP_EVT_PASSKEY_DISPLAY:
+            return "BLE_GAP_EVT_PASSKEY_DISPLAY";
+        case BLE_GAP_EVT_KEY_PRESSED:
+            return "BLE_GAP_EVT_KEY_PRESSED";
+        case BLE_GAP_EVT_AUTH_KEY_REQUEST:
+            return "BLE_GAP_EVT_AUTH_KEY_REQUEST";
+        case BLE_GAP_EVT_LESC_DHKEY_REQUEST:
+            return "BLE_GAP_EVT_LESC_DHKEY_REQUEST";
+        case BLE_GAP_EVT_AUTH_STATUS:
+            return "BLE_GAP_EVT_AUTH_STATUS";
+        case BLE_GAP_EVT_CONN_SEC_UPDATE:
+            return "BLE_GAP_EVT_CONN_SEC_UPDATE";
+        case BLE_GAP_EVT_TIMEOUT:
+            return "BLE_GAP_EVT_TIMEOUT";
+        case BLE_GAP_EVT_RSSI_CHANGED:
+            return "BLE_GAP_EVT_RSSI_CHANGED";
+        case BLE_GAP_EVT_ADV_REPORT:
+            return "BLE_GAP_EVT_ADV_REPORT";
+        case BLE_GAP_EVT_SEC_REQUEST:
+            return "BLE_GAP_EVT_SEC_REQUEST";
+        case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
+            return "BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST";
+        case BLE_GAP_EVT_SCAN_REQ_REPORT:
+            return "BLE_GAP_EVT_SCAN_REQ_REPORT";
+        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
+            return "BLE_GAP_EVT_PHY_UPDATE_REQUEST";
+        case BLE_GAP_EVT_PHY_UPDATE:
+            return "BLE_GAP_EVT_PHY_UPDATE";
+        case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:
+            return "BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST";
+        case BLE_GAP_EVT_DATA_LENGTH_UPDATE:
+            return "BLE_GAP_EVT_DATA_LENGTH_UPDATE";
+        case BLE_GAP_EVT_QOS_CHANNEL_SURVEY_REPORT:
+            return "BLE_GAP_EVT_QOS_CHANNEL_SURVEY_REPORT";
+        case BLE_GAP_EVT_ADV_SET_TERMINATED:
+            return "BLE_GAP_EVT_ADV_SET_TERMINATED";
+
+        case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP:
+            return "BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP";
+        case BLE_GATTC_EVT_REL_DISC_RSP:
+            return "BLE_GATTC_EVT_REL_DISC_RSP";
+        case BLE_GATTC_EVT_CHAR_DISC_RSP:
+            return "BLE_GATTC_EVT_CHAR_DISC_RSP";
+        case BLE_GATTC_EVT_DESC_DISC_RSP:
+            return "BLE_GATTC_EVT_DESC_DISC_RSP";
+        case BLE_GATTC_EVT_ATTR_INFO_DISC_RSP:
+            return "BLE_GATTC_EVT_ATTR_INFO_DISC_RSP";
+        case BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP:
+            return "BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP";
+        case BLE_GATTC_EVT_READ_RSP:
+            return "BLE_GATTC_EVT_READ_RSP";
+        case BLE_GATTC_EVT_CHAR_VALS_READ_RSP:
+            return "BLE_GATTC_EVT_CHAR_VALS_READ_RSP";
+        case BLE_GATTC_EVT_WRITE_RSP:
+            return "BLE_GATTC_EVT_WRITE_RSP";
+        case BLE_GATTC_EVT_HVX:
+            return "BLE_GATTC_EVT_HVX";
+        case BLE_GATTC_EVT_EXCHANGE_MTU_RSP:
+            return "BLE_GATTC_EVT_EXCHANGE_MTU_RSP";
+        case BLE_GATTC_EVT_TIMEOUT:
+            return "BLE_GATTC_EVT_TIMEOUT";
+        case BLE_GATTC_EVT_WRITE_CMD_TX_COMPLETE:
+            return "BLE_GATTC_EVT_WRITE_CMD_TX_COMPLETE";
+
+        case BLE_GATTS_EVT_WRITE:
+            return "BLE_GATTS_EVT_WRITE";
+        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
+            return "BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST";
+        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
+            return "BLE_GATTS_EVT_SYS_ATTR_MISSING";
+        case BLE_GATTS_EVT_HVC:
+            return "BLE_GATTS_EVT_HVC";
+        case BLE_GATTS_EVT_SC_CONFIRM:
+            return "BLE_GATTS_EVT_SC_CONFIRM";
+        case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
+            return "BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST";
+        case BLE_GATTS_EVT_TIMEOUT:
+            return "BLE_GATTS_EVT_TIMEOUT";
+        case BLE_GATTS_EVT_HVN_TX_COMPLETE:
+            return "BLE_GATTS_EVT_HVN_TX_COMPLETE";
+
+        default:
+            return "unknown EVT";
+    }
+};
+#endif
+
 nrf_nvic_state_t nrf_nvic_state = { 0 };
 
 // Flag indicating progress of internal flash operation.
@@ -143,14 +244,11 @@ void SD_EVT_IRQHandler(void) {
         }
 
         ble_evt_t *event = (ble_evt_t *)m_ble_evt_buf;
+
         #if CIRCUITPY_VERBOSE_BLE
         size_t eid = event->header.evt_id;
-        if (eid != 0x1d) {
-            if (BLE_GAP_EVT_BASE <= eid && eid <= BLE_GAP_EVT_LAST) {
-                mp_printf(&mp_plat_print, "BLE GAP event: %d\n", eid - BLE_GAP_EVT_BASE);
-            } else {
-                mp_printf(&mp_plat_print, "BLE event: 0x%04x\n", event->header.evt_id);
-            }
+        if (eid != BLE_GAP_EVT_ADV_REPORT) {
+            mp_printf(&mp_plat_print, "BLE event: %s (0x%04x)\n", ble_drv_evt_name(eid), eid);
         }
         #endif
 

diff --git a/ports/nordic/common-hal/_bleio/Adapter.c b/ports/nordic/common-hal/_bleio/Adapter.c
@@ -668,15 +668,20 @@ mp_obj_t common_hal_bleio_adapter_connect(bleio_adapter_obj_t *self, bleio_addre
         }
     }
 
-    // Negotiate for better PHY, larger MTU and data lengths since we are the central. These are
-    // nice-to-haves so ignore any errors.
+    // Negotiate for better PHY, larger MTU and data lengths since we are the central.
+    // The peer may decline, which is its prerogative.
     ble_gap_phys_t const phys = {
         .rx_phys = BLE_GAP_PHY_AUTO,
         .tx_phys = BLE_GAP_PHY_AUTO,
     };
     sd_ble_gap_phy_update(conn_handle, &phys);
-    sd_ble_gattc_exchange_mtu_request(conn_handle, BLE_GATTS_VAR_ATTR_LEN_MAX);
-    sd_ble_gap_data_length_update(conn_handle, NULL, NULL);
+    // The MTU size passed here has to match the value passed in the BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
+    // event handler in Connection.c, per the SD doc:
+    //     "The value must be equal to Server RX MTU size given in
+    //     sd_ble_gatts_exchange_mtu_reply if an ATT_MTU exchange has
+    //     already been performed in the other direction."
+    check_nrf_error(sd_ble_gattc_exchange_mtu_request(conn_handle, BLE_GATTS_VAR_ATTR_LEN_MAX));
+    check_nrf_error(sd_ble_gap_data_length_update(conn_handle, NULL, NULL));
 
     // Make the connection object and return it.
     for (size_t i = 0; i < BLEIO_TOTAL_CONNECTION_COUNT; i++) {

diff --git a/ports/nordic/common-hal/_bleio/Connection.c b/ports/nordic/common-hal/_bleio/Connection.c
@@ -113,13 +113,15 @@ bool connection_on_ble_evt(ble_evt_t *ble_evt, void *self_in) {
             if (self->mtu > 0) {
                 new_mtu = self->mtu;
             }
-
             self->mtu = new_mtu;
-            sd_ble_gatts_exchange_mtu_reply(self->conn_handle, new_mtu);
+            // The MTU size passed here has to match the value passed in Adapter.c, per the SD doc:
+            //     "The value must be equal to Client RX MTU size given in
+            //     sd_ble_gattc_exchange_mtu_request if an ATT_MTU exchange has
+            //     already been performed in the other direction."
+            check_nrf_error(sd_ble_gatts_exchange_mtu_reply(self->conn_handle, BLE_GATTS_VAR_ATTR_LEN_MAX));
             break;
         }
 
-
         case BLE_GATTC_EVT_EXCHANGE_MTU_RSP: {
             ble_gattc_evt_exchange_mtu_rsp_t *response =
                 &ble_evt->evt.gattc_evt.params.exchange_mtu_rsp;