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Android-DFU-Library
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Some more comments

This commit is contained in:
Aleksander Nowakowski 2014-11-17 11:14:39 +01:00
parent d9087bdc8f
commit e7f70b28d4
1 changed files with 13 additions and 6 deletions
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19
src/no/nordicsemi/android/dfu/DfuBaseService.java
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@ -470,19 +470,26 @@ public abstract class DfuBaseService extends IntentService {
/*
* The onConnectionStateChange callback is called just after establishing connection and before sending Encryption Request BLE event in case of a paired device.
* In that case and when the Service Changed CCCD is enabled we will get the indication after initializing the encryption, few hundreds milliseconds later.
* If we discover services to right immediately, the onServicesDiscovered callback will be called before the indication and the following service discovery
* and we may end up with old, application's services instead.
* In that case and when the Service Changed CCCD is enabled we will get the indication after initializing the encryption, about 1600 milliseconds later.
* If we discover services right after connecting, the onServicesDiscovered callback will be called immediately, before receiving the indication and the following
* service discovery and we may end up with old, application's services instead.
*
* This is to support the buttonless switch from application to bootloader mode.
* This is to support the buttonless switch from application to bootloader mode where the DFU bootloader notifies the master about service change.
* Tested on Nexus 4 (Android 4.4.4 and 5), Nexus 5 (Android 5), Samsung Note 2 (Android 4.4.2). The time after connection to end of service discovery is about 1.6s
* on Samsung Note 2.
*
* NOTE: We are doing this to avoid the hack with calling the hidden gatt.refresh() method, at least for bonded devices.
*/
if (gatt.getDevice().getBondState() == BluetoothDevice.BOND_BONDED) {
try {
synchronized (this) {
logd("Waiting 600 ms for a possible Service Changed indication...");
wait(600);
logd("Waiting 1600 ms for a possible Service Changed indication...");
wait(1600);
// After 1.6s the services are already discovered so the following gatt.discoverServices() finishes almost immediately.
// NOTE: This also works with shorted waiting time. The gatt.discoverServices() must be called after the indication is received which is
// about 600ms after establishing connection. Values 600 - 1600ms should be OK.
}
} catch (InterruptedException e) {
// do nothing