ESP32S2: Allow connecting to specific bssid

locale/circuitpython.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-09-11 13:30+0200\n"
+"POT-Creation-Date: 2020-09-16 17:07-0700\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -960,6 +960,10 @@ msgstr ""
 msgid "Invalid BMP file"
 msgstr ""
 
+#: shared-bindings/wifi/Radio.c
+msgid "Invalid BSSID"
+msgstr ""
+
 #: ports/stm/common-hal/analogio/AnalogOut.c
 msgid "Invalid DAC pin supplied"
 msgstr ""

ports/esp32s2/common-hal/wifi/Network.c

@@ -35,6 +35,12 @@ mp_obj_t common_hal_wifi_network_get_ssid(wifi_network_obj_t *self) {
 	return mp_obj_new_str(cstr, strlen(cstr));
 }
 
+#define MAC_ADDRESS_LENGTH 6
+
+mp_obj_t common_hal_wifi_network_get_bssid(wifi_network_obj_t *self) {
+    return mp_obj_new_bytes(self->record.bssid, MAC_ADDRESS_LENGTH);
+}
+
 mp_obj_t common_hal_wifi_network_get_rssi(wifi_network_obj_t *self) {
     return mp_obj_new_int(self->record.rssi);
 }

ports/esp32s2/common-hal/wifi/Radio.c

@@ -104,14 +104,22 @@ void common_hal_wifi_radio_stop_scanning_networks(wifi_radio_obj_t *self) {
     self->current_scan = NULL;
 }
 
-wifi_radio_error_t common_hal_wifi_radio_connect(wifi_radio_obj_t *self, uint8_t* ssid, size_t ssid_len, uint8_t* password, size_t password_len, uint8_t channel, mp_float_t timeout) {
+wifi_radio_error_t common_hal_wifi_radio_connect(wifi_radio_obj_t *self, uint8_t* ssid, size_t ssid_len, uint8_t* password, size_t password_len, uint8_t channel, mp_float_t timeout, uint8_t* bssid, size_t bssid_len) {
     // check enabled
     wifi_config_t* config = &self->sta_config;
     memcpy(&config->sta.ssid, ssid, ssid_len);
     config->sta.ssid[ssid_len] = 0;
     memcpy(&config->sta.password, password, password_len);
     config->sta.password[password_len] = 0;
     config->sta.channel = channel;
+    // From esp_wifi_types.h:
+    //   Generally, station_config.bssid_set needs to be 0; and it needs
+    //   to be 1 only when users need to check the MAC address of the AP
+    if (bssid_len > 0){
+        memcpy(&config->sta.bssid, bssid, bssid_len);
+        config->sta.bssid[bssid_len] = 0;
+        config->sta.bssid_set = 1;
+    }
     esp_wifi_set_config(ESP_IF_WIFI_STA, config);
     self->starting_retries = 5;
     self->retries_left = 5;

shared-bindings/wifi/Network.c

@@ -58,6 +58,23 @@ const mp_obj_property_t wifi_network_ssid_obj = {
 };
 
 
+//|     bssid: bytes
+//|     """BSSID of the network (usually the AP's MAC address)"""
+//|
+STATIC mp_obj_t wifi_network_get_bssid(mp_obj_t self) {
+    return common_hal_wifi_network_get_bssid(self);
+
+}
+MP_DEFINE_CONST_FUN_OBJ_1(wifi_network_get_bssid_obj, wifi_network_get_bssid);
+
+const mp_obj_property_t wifi_network_bssid_obj = {
+    .base.type = &mp_type_property,
+    .proxy = { (mp_obj_t)&wifi_network_get_bssid_obj,
+               (mp_obj_t)&mp_const_none_obj,
+               (mp_obj_t)&mp_const_none_obj },
+};
+
+
 //|     rssi: int
 //|     """Signal strength of the network"""
 //|
@@ -94,6 +111,7 @@ const mp_obj_property_t wifi_network_channel_obj = {
 
 STATIC const mp_rom_map_elem_t wifi_network_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_ssid), MP_ROM_PTR(&wifi_network_ssid_obj) },
+    { MP_ROM_QSTR(MP_QSTR_bssid), MP_ROM_PTR(&wifi_network_bssid_obj) },
     { MP_ROM_QSTR(MP_QSTR_rssi), MP_ROM_PTR(&wifi_network_rssi_obj) },
     { MP_ROM_QSTR(MP_QSTR_channel), MP_ROM_PTR(&wifi_network_channel_obj) },
 };

shared-bindings/wifi/Network.h

@@ -36,6 +36,7 @@
 const mp_obj_type_t wifi_network_type;
 
 extern mp_obj_t common_hal_wifi_network_get_ssid(wifi_network_obj_t *self);
+extern mp_obj_t common_hal_wifi_network_get_bssid(wifi_network_obj_t *self);
 extern mp_obj_t common_hal_wifi_network_get_rssi(wifi_network_obj_t *self);
 extern mp_obj_t common_hal_wifi_network_get_channel(wifi_network_obj_t *self);
 

shared-bindings/wifi/Radio.c

@@ -108,11 +108,12 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(wifi_radio_stop_scanning_networks_obj, wifi_rad
 //|         ...
 //|
 STATIC mp_obj_t wifi_radio_connect(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
-    enum { ARG_ssid, ARG_password, ARG_channel, ARG_timeout };
+    enum { ARG_ssid, ARG_password, ARG_channel, ARG_bssid, ARG_timeout };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_ssid, MP_ARG_REQUIRED | MP_ARG_OBJ },
         { MP_QSTR_password,  MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
         { MP_QSTR_channel, MP_ARG_KW_ONLY |  MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_bssid, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
         { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
     };
 
@@ -125,7 +126,6 @@ STATIC mp_obj_t wifi_radio_connect(size_t n_args, const mp_obj_t *pos_args, mp_m
         timeout = mp_obj_get_float(args[ARG_timeout].u_obj);
     }
 
-
     mp_buffer_info_t ssid;
     mp_get_buffer_raise(args[ARG_ssid].u_obj, &ssid, MP_BUFFER_READ);
 
@@ -138,7 +138,19 @@ STATIC mp_obj_t wifi_radio_connect(size_t n_args, const mp_obj_t *pos_args, mp_m
         }
     }
 
-    wifi_radio_error_t error = common_hal_wifi_radio_connect(self, ssid.buf, ssid.len, password.buf, password.len, args[ARG_channel].u_int, timeout);
+    #define MAC_ADDRESS_LENGTH 6
+
+    mp_buffer_info_t bssid;
+    bssid.len = 0;
+    // Should probably make sure bssid is just bytes and not something else too
+    if (args[ARG_bssid].u_obj != MP_OBJ_NULL) {
+        mp_get_buffer_raise(args[ARG_bssid].u_obj, &bssid, MP_BUFFER_READ);
+        if (bssid.len != MAC_ADDRESS_LENGTH) {
+            mp_raise_ValueError(translate("Invalid BSSID"));
+        }
+    }
+
+    wifi_radio_error_t error = common_hal_wifi_radio_connect(self, ssid.buf, ssid.len, password.buf, password.len, args[ARG_channel].u_int, timeout, bssid.buf, bssid.len);
     if (error == WIFI_RADIO_ERROR_AUTH) {
         mp_raise_ConnectionError(translate("Authentication failure"));
     } else if (error == WIFI_RADIO_ERROR_NO_AP_FOUND) {

shared-bindings/wifi/Radio.h

@@ -51,7 +51,7 @@ extern mp_obj_t common_hal_wifi_radio_get_mac_address(wifi_radio_obj_t *self);
 extern mp_obj_t common_hal_wifi_radio_start_scanning_networks(wifi_radio_obj_t *self);
 extern void common_hal_wifi_radio_stop_scanning_networks(wifi_radio_obj_t *self);
 
-extern wifi_radio_error_t common_hal_wifi_radio_connect(wifi_radio_obj_t *self, uint8_t* ssid, size_t ssid_len, uint8_t* password, size_t password_len, uint8_t channel, mp_float_t timeout);
+extern wifi_radio_error_t common_hal_wifi_radio_connect(wifi_radio_obj_t *self, uint8_t* ssid, size_t ssid_len, uint8_t* password, size_t password_len, uint8_t channel, mp_float_t timeout, uint8_t* bssid, size_t bssid_len);
 
 extern mp_obj_t common_hal_wifi_radio_get_ipv4_address(wifi_radio_obj_t *self);