electrumx_rpc: raise timeout to 30s; show exception as string

electrumx_rpc

@@ -10,12 +10,12 @@
 '''Script to send RPC commands to a running ElectrumX server.'''
 
 
-from aiorpcx import timeout_after, Connector, RPCSession, TaskTimeout
 import argparse
 import asyncio
 import json
 from os import environ
 
+from aiorpcx import timeout_after, Connector, RPCSession
 import electrumx.lib.text as text
 
 
@@ -113,7 +113,7 @@ def main():
     # aiorpcX makes this so easy...
     async def send_request():
         try:
-            async with timeout_after(15):
+            async with timeout_after(30):
                 async with Connector(RPCSession, 'localhost', port) as session:
                     session.framer.max_size = 0
                     result = await session.send_request(method, args)
@@ -130,7 +130,7 @@ def main():
             print('cannot connect - is ElectrumX catching up, not running, or '
                   f'is {port} the wrong RPC port?')
         except Exception as e:
-            print(f'error making request: {e!r}')
+            print(f'error making request: {e}')
 
     loop = asyncio.get_event_loop()
     loop.run_until_complete(send_request())