7fa322afb8
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.
109 lines
2.7 KiB
Python
109 lines
2.7 KiB
Python
# Test of a ESPnow echo server and client transferring data.
|
|
# This test works with ESP32 or ESP8266 as server or client.
|
|
|
|
try:
|
|
import network
|
|
import random
|
|
import espnow
|
|
except ImportError:
|
|
print("SKIP")
|
|
raise SystemExit
|
|
|
|
# Set read timeout to 5 seconds
|
|
timeout_ms = 5000
|
|
default_pmk = b"MicroPyth0nRules"
|
|
sync = True
|
|
|
|
|
|
def echo_server(e):
|
|
peers = []
|
|
i = 0
|
|
while True:
|
|
peer, msg = e.irecv(timeout_ms)
|
|
i += 1
|
|
if i % 10 == 0:
|
|
print("OK:", i)
|
|
if peer is None:
|
|
return
|
|
if peer not in peers:
|
|
peers.append(peer)
|
|
e.add_peer(peer)
|
|
|
|
# Echo the MAC and message back to the sender
|
|
if not e.send(peer, msg, sync):
|
|
print("ERROR: send() failed to", peer)
|
|
return
|
|
|
|
if msg == b"!done":
|
|
return
|
|
|
|
|
|
def echo_test(e, peer, msg, sync):
|
|
try:
|
|
if not e.send(peer, msg, sync):
|
|
print("ERROR: Send failed.")
|
|
return
|
|
except OSError as exc:
|
|
# Don't print exc as it is differs for esp32 and esp8266
|
|
print("ERROR: OSError:")
|
|
return
|
|
|
|
p2, msg2 = e.irecv(timeout_ms)
|
|
if msg2 != msg:
|
|
print("ERROR: Received != Sent")
|
|
|
|
|
|
def echo_client(e, peer, msglens):
|
|
for sync in [True]:
|
|
for msglen in msglens:
|
|
msg = bytearray(msglen)
|
|
if msglen > 0:
|
|
msg[0] = b"_"[0] # Random message must not start with '!'
|
|
for i in range(1, msglen):
|
|
msg[i] = random.getrandbits(8)
|
|
echo_test(e, peer, msg, sync)
|
|
|
|
|
|
def init(sta_active=True, ap_active=False):
|
|
wlans = [network.WLAN(i) for i in [network.STA_IF, network.AP_IF]]
|
|
e = espnow.ESPNow()
|
|
e.active(True)
|
|
e.set_pmk(default_pmk)
|
|
wlans[0].active(sta_active)
|
|
wlans[1].active(ap_active)
|
|
wlans[0].disconnect() # Force esp8266 STA interface to disconnect from AP
|
|
return e
|
|
|
|
|
|
# Server
|
|
def instance0():
|
|
e = init(True, False)
|
|
multitest.globals(PEERS=[network.WLAN(i).config("mac") for i in (0, 1)])
|
|
multitest.next()
|
|
print("Server Start")
|
|
echo_server(e)
|
|
print("Server Done")
|
|
e.active(False)
|
|
|
|
|
|
# Client
|
|
def instance1():
|
|
e = init(True, False)
|
|
multitest.next()
|
|
peer = PEERS[0]
|
|
e.add_peer(peer)
|
|
echo_test(e, peer, b"ping", True)
|
|
gc.collect()
|
|
mem_start = gc.mem_alloc()
|
|
for i in range(10):
|
|
echo_client(e, peer, [250] * 10)
|
|
print("OK:", (i + 1) * 10)
|
|
echo_test(e, peer, b"!done", True)
|
|
gc.collect()
|
|
mem_end = gc.mem_alloc()
|
|
if mem_end - mem_start < 1024:
|
|
print("OK: Less than 1024 bytes consumed")
|
|
else:
|
|
print("Error: Memory consumed is", mem_end - mem_start)
|
|
e.active(False)
|