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ESP-NOW is a proprietary wireless communication protocol which supports
connectionless communication between ESP32 and ESP8266 devices, using
vendor specific WiFi frames. This commit adds support for this protocol
through a new `espnow` module.
This commit builds on original work done by @nickzoic, @shawwwn and with
contributions from @zoland. Features include:
- Use of (extended) ring buffers in py/ringbuf.[ch] for robust IO.
- Signal strength (RSSI) monitoring.
- Core support in `_espnow` C module, extended by `espnow.py` module.
- Asyncio support via `aioespnow.py` module (separate to this commit).
- Docs provided at `docs/library/espnow.rst`.
Methods available in espnow.ESPNow class are:
- active(True/False)
- config(): set rx buffer size, read timeout and tx rate
- recv()/irecv()/recvinto() to read incoming messages from peers
- send() to send messages to peer devices
- any() to test if a message is ready to read
- irq() to set callback for received messages
- stats() returns transfer stats:
(tx_pkts, tx_pkt_responses, tx_failures, rx_pkts, lost_rx_pkts)
- add_peer(mac, ...) registers a peer before sending messages
- get_peer(mac) returns peer info: (mac, lmk, channel, ifidx, encrypt)
- mod_peer(mac, ...) changes peer info parameters
- get_peers() returns all peer info tuples
- peers_table supports RSSI signal monitoring for received messages:
{peer1: [rssi, time_ms], peer2: [rssi, time_ms], ...}
ESP8266 is a pared down version of the ESP32 ESPNow support due to code
size restrictions and differences in the low-level API. See docs for
details.
Also included is a test suite in tests/multi_espnow. This tests basic
espnow data transfer, multiple transfers, various message sizes, encrypted
messages (pmk and lmk), and asyncio support.
Initial work is from https://github.com/micropython/micropython/pull/4115.
Initial import of code is from:
https://github.com/nickzoic/micropython/tree/espnow-4115.
58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
# Simple test of a ESPnow server and client transferring data.
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# This test works with ESP32 or ESP8266 as server or client.
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try:
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import network
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import espnow
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except ImportError:
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print("SKIP")
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raise SystemExit
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# Set read timeout to 5 seconds
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timeout_ms = 5000
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default_pmk = b"MicroPyth0nRules"
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def init(sta_active=True, ap_active=False):
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wlans = [network.WLAN(i) for i in [network.STA_IF, network.AP_IF]]
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e = espnow.ESPNow()
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e.active(True)
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e.set_pmk(default_pmk)
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wlans[0].active(sta_active)
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wlans[1].active(ap_active)
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wlans[0].disconnect() # Force esp8266 STA interface to disconnect from AP
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e.set_pmk(default_pmk)
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return e
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# Server
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def instance0():
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e = init(True, False)
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multitest.globals(PEERS=[network.WLAN(i).config("mac") for i in (0, 1)])
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multitest.next()
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peer, msg1 = e.recv(timeout_ms)
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if msg1 is None:
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print("e.recv({timeout_ms}): Timeout waiting for message.")
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e.active(False)
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return
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print(bytes(msg1))
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msg2 = b"server to client"
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e.add_peer(peer)
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e.send(peer, msg2)
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print(bytes(msg2))
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e.active(False)
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# Client
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def instance1():
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e = init(True, False)
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multitest.next()
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peer = PEERS[0]
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e.add_peer(peer)
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msg1 = b"client to server"
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e.send(peer, msg1)
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print(bytes(msg1))
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peer2, msg2 = e.recv(timeout_ms)
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print(bytes(msg2))
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e.active(False)
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