# BC118 possible bug

**URL:** <https://forum.sierrawireless.com/t/bc118-possible-bug/12708>\
**Category:** WiFi and Bluetooth Modules\
**Created:** [May 22, 2018, 9:04pm UTC](https://forum.sierrawireless.com/t/bc118-possible-bug/12708 "2018-05-22T21:04:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![utpbr](https://avatars.discourse-cdn.com/v4/letter/u/838e76/32.png) [@utpbr](https://forum.sierrawireless.com/u/utpbr)\
**Post date:** [May 22, 2018, 9:04pm UTC](https://forum.sierrawireless.com/t/bc118-possible-bug/12708/1 "2018-05-22T21:04:58Z")

</div>

I’m testing a BC118 module in my project but it seems it’s not accepting a frame starting with **0x00** when I write this frame to it, using the SND command.

When I start the frame with “0x00”, the MelodySmart Android App shows “ERR”.

This is a piece of code to illustrate it better:

```
char BLE_Buffer_Tx[30];

char byTest[] = {0x00, 0x0A, 0x0A, 0x0B, 0x0B};
memcpy(&BLE_Buffer_Tx, "SND ", 4); //Consider I'm using the space character after SND.
memcpy(&BLE_Buffer_Tx, byTest, 5);
memcpy(&BLE_Buffer_Tx, "\r", 1);

```

If I write this frame (BLE\_Buffer\_Tx) to BC118, the message “ERR” will appear in MelodySmart App.  
Otherwise, if I change **only the first byte** to any value other than 0x00, it will work:

U8 byTest[] = { **0x01** , 0x0A, 0x0A, 0x0B, 0x0B};  
memcpy(&BLE\_Buffer\_Tx, "SND ", 4);  
memcpy(&BLE\_Buffer\_Tx, byTest, 5);  
memcpy(&BLE\_Buffer\_Tx, “\r”, 1);

In this case, MelodySmart Android App will show **Ok**.

I’m trying to figure out what’s causing this problem. Could anyone help me with this?

Thx!