ESP32 Forum

Trying to setup iBecon demo.

ESP32 - running as iBeacon reciever.
Android phone - running Beacon Simulator(this enbales you phone to act as a iBeacon).


ESP firmware is built and running
rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 188777542, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:6368
ho 0 tail 12 room 4
load:0x40078000,len:13784
ho 0 tail 12 room 4
load:0x40080400,len:4260
entry 0x400806e4
I (32) boot: ESP-IDF v4.0-beta2 2nd stage bootloader
I (33) boot: compile time 11:02:30
I (33) boot: Enabling RNG early entropy source...
I (38) boot: SPI Speed : 40MHz
I (42) boot: SPI Mode : DIO
I (46) boot: SPI Flash Size : 4MB
I (50) boot: Partition Table:
I (53) boot: ## Label Usage Type ST Offset Length
I (61) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (68) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (76) boot: 2 factory factory app 00 00 00010000 00100000
I (83) boot: End of partition table
I (87) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x1afd4 (110548) map
I (136) esp_image: segment 1: paddr=0x0002affc vaddr=0x3ffbdb60 size=0x02c04 ( 11268) load
I (140) esp_image: segment 2: paddr=0x0002dc08 vaddr=0x40080000 size=0x00400 ( 1024) load
I (143) esp_image: segment 3: paddr=0x0002e010 vaddr=0x40080400 size=0x02000 ( 8192) load
I (155) esp_image: segment 4: paddr=0x00030018 vaddr=0x400d0018 size=0x7168c (464524) map
I (326) esp_image: segment 5: paddr=0x000a16ac vaddr=0x40082400 size=0x100e0 ( 65760) load
I (365) boot: Loaded app from partition at offset 0x10000
I (365) boot: Disabling RNG early entropy source...
I (366) cpu_start: Pro cpu up.
I (369) cpu_start: Application information:
I (374) cpu_start: Project name: ble_ibeacon_demo
I (380) cpu_start: App version: 1
I (384) cpu_start: Compile time: Apr 2 2020 12:05:20
I (390) cpu_start: ELF file SHA256: 9c7ce50c5ab55af8...
I (396) cpu_start: ESP-IDF: v4.0-beta2
I (402) cpu_start: Starting app cpu, entry point is 0x4008125c
I (392) cpu_start: App cpu up.
I (412) heap_init: Initializing. RAM available for dynamic allocation:
I (419) heap_init: At 3FFAFF10 len 000000F0 (0 KiB): DRAM
I (425) heap_init: At 3FFB6388 len 00001C78 (7 KiB): DRAM
I (431) heap_init: At 3FFB9A20 len 00004108 (16 KiB): DRAM
I (437) heap_init: At 3FFBDB5C len 00000004 (0 KiB): DRAM
I (443) heap_init: At 3FFC89F0 len 00017610 (93 KiB): DRAM
I (450) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (456) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (462) heap_init: At 400924E0 len 0000DB20 (54 KiB): IRAM
I (469) cpu_start: Pro cpu start user code
I (487) spi_flash: detected chip: generic
I (488) spi_flash: flash io: dio
I (488) cpu_start: Chip Revision: 1
W (489) cpu_start: Chip revision is higher than the one configured in menuconfig. Suggest to upgrade it.
I (499) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (575) BTDM_INIT: BT controller compile version [d6bb204]
I (585) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (685) phy: phy_version: 4102, 2fa7a43, Jul 15 2019, 13:06:06, 0, 0
I (1005) IBEACON_DEMO: register callback


Issue is i never see the ESP32 dectect the iBeacon running on my phone.

anybody help ?

There is not much to say with only those logs. There is no crash, no backtrace etc.
Without code nothing we can do.

Why not build the iBeacon demo and get Beacon Simulator from google app store ?
This will then show you that the iBeacon are not received.

my issue is around this function that checks if the data is a valid ibeacon packet.

esp_ble_is_ibeacon_packet (uint8_t *adv_data, uint8_t adv_data_len)

the adv_data_len is showing as 27bytes..... but the check on the length is looking for 30bytes.

I (96385) IBEACON_DEMO: Device adv_data_length: 27
I (96635) IBEACON_DEMO: Device adv_data_length: 27
I (96775) IBEACON_DEMO: Device adv_data_length: 28
I (96885) IBEACON_DEMO: Device adv_data_length: 27
I (97025) IBEACON_DEMO: Device adv_data_length: 28
I (98065) IBEACON_DEMO: Device adv_data_length: 28
I (98165) IBEACON_DEMO: Device adv_data_length: 27
I (98425) IBEACON_DEMO: Device adv_data_length: 27
I (98575) IBEACON_DEMO: Device adv_data_length: 28

the 28 byte packets are altbeacons.


So why ? see attached img showing the debugging and the memory that does not look correct....

the adv_data pointer is missing the 3 adv flags........

This is why the iBeacon is 27 and not 30 bytes long.

and this also means it would fail the next logic check

if (!memcmp(adv_data, (uint8_t*)&ibeacon_common_head, sizeof(ibeacon_common_head))){
result = true;
}

As the adv_data is missing the adv flags the content of adv_data will not be the same as ibeacon_comon_head.....!!!



So the question is why are the adv flags missing from the adv_data ?

and just for extra proof here is debug outputting avd_len and the avd_data

I (13675) IBEACON_DEMO: Device adv_data_length: 27
I (13675) IBEACON_DEMO: adv_data: 0 -> 1A //why is this the first byte it should be 0x02
I (13675) IBEACON_DEMO: adv_data: 1 -> FF
I (13675) IBEACON_DEMO: adv_data: 2 -> 4C
I (13685) IBEACON_DEMO: adv_data: 3 -> 00
I (13685) IBEACON_DEMO: adv_data: 4 -> 02
I (13695) IBEACON_DEMO: adv_data: 5 -> 15
I (13695) IBEACON_DEMO: adv_data: 6 -> 03
I (13705) IBEACON_DEMO: adv_data: 7 -> AE
I (13705) IBEACON_DEMO: adv_data: 8 -> FE
I (13715) IBEACON_DEMO: adv_data: 9 -> 97
I (13715) IBEACON_DEMO: adv_data: 10 -> EF
I (13725) IBEACON_DEMO: adv_data: 11 -> C2
I (13725) IBEACON_DEMO: adv_data: 12 -> 43
I (13735) IBEACON_DEMO: adv_data: 13 -> 73
I (13735) IBEACON_DEMO: adv_data: 14 -> 9C
I (13735) IBEACON_DEMO: adv_data: 15 -> A9
I (13745) IBEACON_DEMO: adv_data: 16 -> 05
I (13745) IBEACON_DEMO: adv_data: 17 -> AF
I (13755) IBEACON_DEMO: adv_data: 18 -> A9
I (13755) IBEACON_DEMO: adv_data: 19 -> 8E
I (13765) IBEACON_DEMO: adv_data: 20 -> D2
I (13765) IBEACON_DEMO: adv_data: 21 -> B4
I (13775) IBEACON_DEMO: adv_data: 22 -> 00
I (13775) IBEACON_DEMO: adv_data: 23 -> 7B
I (13785) IBEACON_DEMO: adv_data: 24 -> 01
I (13785) IBEACON_DEMO: adv_data: 25 -> C8
I (13795) IBEACON_DEMO: adv_data: 26 -> BF

found the issue, the app i was using was the fault........
Had another ESP32 module that i flashed up with the iBeacon sender and it now works ok