Replace template-based prepare_flowgraph() with build_fm_receiver() that
constructs the entire flowgraph in Python code:
- Initialize Platform (same as gr-mcp main.py)
- Create variables: samp_rate, freq
- Create blocks: osmosdr_source, low_pass_filter, analog_wfm_rcv, audio_sink
- Add xmlrpc_server for runtime frequency control
- Connect signal chain: source → LPF → demod → audio
- Save and compile with grcc
This proves gr-mcp's middleware approach works end-to-end: parameters
set via set_params() serialize correctly after the lru_cache fix.
No longer needs examples/fm_receiver.grc template file.
Ryan Malloy
2a5e73e9a7