Auto-Connect/Re-connect Issue with Ble Manager in React Native

[prabu-nesh]

I'm facing an issue with auto-connecting and re-connecting devices using BleManager in React Native. The connection process is working for the initial connection, but the subsequent reconnect attempts are failing. The goal is to connect to a peripheral, set the MTU size, retrieve services, and handle the connected device's characteristics. However, the reconnect logic does not seem to be functioning as expected.

Here is the code that I am currently using:

const onConnect = async (item) => {
try {
await new Promise(async () => {
await BleManager.connect(item);
// Await the MTU request
await BleManager.requestMTU(item, 517);
BleManager.retrieveServices(item).then((res) => {
// handle characteristics response
});
});
} catch (error) {
console.error("Connection error:", error);
}
};

const onConnectedDevices = async () => {
await BleManager.getConnectedPeripherals([]).then(async (peripherals) => {
if (peripherals.length > 0) {
onConnect(peripherals[0]?.id);
}
});
};

Expected Behavior:

• The first connection attempt should succeed, and the MTU request and service retrieval should work fine.
• On subsequent calls to onConnectedDevices, the device should reconnect successfully and handle the same operations (MTU request, retrieve services).

Current Behavior:

• The initial connection works as expected, but the reconnection does not establish a stable connection.
• The device may appear as connected, but operations like MTU size adjustment and service retrieval fail.
• No error message is thrown, making it difficult to debug.