From ce8f59e0c21db97b24f02333a84ad71ff33f7dd7 Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Thu, 12 Aug 2021 15:46:32 -0500
Subject: [PATCH] firmware: fix flashing on Android

Hubs that don't use the minimum chunk size will fail on Android since
it defaults to the smallest possible MTU.

Issue: https://github.com/pybricks/support/issues/403
---
 src/firmware/sagas.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/firmware/sagas.ts b/src/firmware/sagas.ts
index b523bde0..cba8ca3d 100644
--- a/src/firmware/sagas.ts
+++ b/src/firmware/sagas.ts
@@ -55,6 +55,7 @@ import {
 import { RootState } from '../reducers';
 import { defined, maybe } from '../utils';
 import { fmod, sumComplement32 } from '../utils/math';
+import { isAndroid } from '../utils/os';
 import {
     FailToFinishReasonType,
     FlashFirmwareActionType,
@@ -376,8 +377,9 @@ function* flashFirmware(action: FlashFirmwareFlashAction): Generator {
             yield* disconnectAndCancel();
         }
 
-        // 14 is "safe" size for all hubs
-        const maxDataSize = MaxProgramFlashSize.get(info.hubType) || 14;
+        // 14 is "safe" size for all hubs and Android
+        const maxDataSize =
+            (!isAndroid() && MaxProgramFlashSize.get(info.hubType)) || 14;
 
         for (let count = 1, offset = 0; ; count++) {
             const payload = firmware.slice(offset, offset + maxDataSize);