Node / meshtastic / Meshtastic-Android / files / core / network / src / commonTest / kotlin / org / meshtastic / core / network / radio / ReconnectBackoffTest.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.core.network.radio

Tff7b72import T7ee787kotlin.test.Test

Tff7b72import T7ee787kotlin.test.assertEquals

Tff7b72import T7ee787kotlin.test.assertTrue

Tff7b72import T7ee787kotlin.time.Duration.Companion.seconds

T8b949e/**

* Tests the exponential backoff schedule used by [BleRadioTransport] when consecutive connection attempts fail. The

* schedule is: failure #1 → 5 s failure #2 → 10 s failure #3 → 20 s failure #4 → 40 s failure #5+ → 60 s (capped)

*/

Tff7b72class T56d364ReconnectBackoffTest Tb4b4b4{

Tf0883e@Test

Tff7b72fun Td2a8ff`zero failures yields base delay`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff5.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff0Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`first failure yields 5s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff5.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff1Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`second failure yields 10s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff1T79c0ff0.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff2Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`third failure yields 20s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff2T79c0ff0.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff3Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`fourth failure yields 40s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff4T79c0ff0.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff4Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`fifth failure is capped at 60s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff6T79c0ff0.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff5Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`large failure count stays capped at 60s`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Te6edf3assertEqualsTb4b4b4(T79c0ff6T79c0ff0.Te6edf3secondsTb4b4b4, Te6edf3computeReconnectBackoffTb4b4b4(T79c0ff1T79c0ff0T79c0ff0Tb4b4b4)Tb4b4b4)

Tb4b4b4}

Tf0883e@Test

Tff7b72fun Td2a8ff`backoff is strictly increasing up to the cap`Tb4b4b4(Tb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3values Tff7b72= Tb4b4b4(T79c0ff1.Tb4b4b4.T79c0ff5Tb4b4b4)Tb4b4b4.Te6edf3map Tb4b4b4{ Te6edf3computeReconnectBackoffTb4b4b4(Tffa657itTb4b4b4) Tb4b4b4}

Tff7b72for Tb4b4b4(Te6edf3i Tff7b72in T79c0ff0 Te6edf3until Te6edf3valuesTb4b4b4.Te6edf3size Tff7b72- T79c0ff1Tb4b4b4) Tb4b4b4{

Te6edf3assertTrueTb4b4b4(

Te6edf3valuesTff7b72[Te6edf3iTff7b72] Tff7b72< Te6edf3valuesTff7b72[Te6edf3i Tff7b72+ T79c0ff1Tff7b72]Tb4b4b4,

Ta5d6ff"Ta5d6ffExpected backoff[Tffd700${Te6edf3i Tff7b72+ T79c0ff1Tffd700}Ta5d6ff] (Tffd700${Te6edf3valuesTff7b72[Te6edf3iTff7b72]Tffd700}Ta5d6ff) < backoff[Tffd700${Te6edf3i Tff7b72+ T79c0ff2Tffd700}Ta5d6ff] (Tffd700${Te6edf3valuesTff7b72[Te6edf3i Tff7b72+ T79c0ff1Tff7b72]Tffd700}Ta5d6ff)Ta5d6ff"Tb4b4b4,

Tb4b4b4)

Tb4b4b4}

Tb4b4b4}

Tb4b4b4}