Hello everyone,
I’m working on a BLE HID project with an ESP32-C3 using the
NimBLE-Arduino library. The goal is to make the ESP32 act as a BLE media
remote (sending Play/Pause commands).
The code compiles and runs without errors in PlatformIO, but here’s the
problem:
On my Android phone (Samsung A32), I cannot see the ESP32 device in the
Bluetooth list.
I am advertising the HID service properly:
1 | pAdvertising->addServiceUUID(hid->getHidService()->getUUID());
|
2 | pAdvertising->start();
|
I’m using a minimal HID report map for Play/Pause.
Here is my code
1 | #include <NimBLEDevice.h>
|
2 | #include <NimBLEHIDDevice.h>
|
3 | #include <HIDTypes.h>
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4 |
|
5 | NimBLEHIDDevice* hid;
|
6 | BLECharacteristic* input;
|
7 | bool sent = false;
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8 |
|
9 | void setup() {
|
10 | Serial.begin(115200);
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11 | NimBLEDevice::init("ESP32-C3 Media Remote");
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12 |
|
13 | NimBLEServer* pServer = NimBLEDevice::createServer();
|
14 | hid = new NimBLEHIDDevice(pServer);
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15 |
|
16 | input = hid->getInputReport(1);
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17 |
|
18 | hid->setManufacturer("MyManufacturer");
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19 | hid->setPnp(0x02, 0xe502, 0xa111, 0x0210);
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20 | hid->setHidInfo(0x00, 0x01);
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21 |
|
22 | hid->setReportMap((uint8_t*)reportMap, sizeof(reportMap));
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23 | hid->startServices();
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24 |
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25 | NimBLEAdvertising* pAdvertising = NimBLEDevice::getAdvertising();
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26 | pAdvertising->setAppearance(HID_KEYBOARD);
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27 | pAdvertising->addServiceUUID(hid->getHidService()->getUUID());
|
28 | pAdvertising->start();
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29 |
|
30 | Serial.println("BLE Media Remote ready!");
|
31 | }
|
32 |
|
33 | void loop() {
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34 | if (!sent && NimBLEDevice::getServer()->getConnectedCount() > 0) {
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35 | Serial.println("Sending Play/Pause...");
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36 |
|
37 | uint8_t press[1] = {0x01}; // press Play/Pause
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38 | input->setValue(press, sizeof(press));
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39 | input->notify();
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40 | delay(100);
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41 |
|
42 | uint8_t release[1] = {0x00}; // release key
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43 | input->setValue(release, sizeof(release));
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44 | input->notify();
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45 |
|
46 | sent = true;
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47 | }
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48 | }
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I’ve tried:
Restarting the phone and ESP32
Using different BLE scanning apps like nRF Connect
Checking that the ESP32 is powered and advertising
But my phone still doesn’t detect it.
Questions:
Are there any specific settings required to make an ESP32-C3 BLE HID
visible to mobile devices?
Could this be a compatibility issue with certain phones?
Any tips for debugging BLE advertising issues on ESP32-C3?
Thanks in advance for any guidance!
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