@bot.command(command=['rbnspots'])
async def rbn(ctx, *, msg : str = ''):
    '''RBN Graphs, thanks to Fabian Kurz, DJ1YFK '''
    with ctx.typing():
        async with aiohttp.ClientSession() as session:
            async with session.get('https://foc.dj1yfk.de/activity/image/{call}.png') as resp:
                if resp.status != 200:
                    return await ctx.send('Could not download file...')
                data = io.BytesIO(await resp.read())
    await ctx.send(file=discord.File(data, 'rbn.png'))